CN117780998A - Pressure reducing valve - Google Patents

Abstract

The pressure reducing valve includes a spring support member for supporting a pressure reducing spring, a screw adjustment member for adjusting the position of the spring support member, and a fixing member for fixing the screw adjustment member. The screw adjustment member has an external thread portion that is screwed into an internal thread hole provided in the main body and abuts against the spring support member, an end wall, and a peripheral wall in which the internal thread portion is formed on an inner peripheral surface. The male screw portion protrudes from the end wall, and a plurality of insertion holes are formed around the male screw portion. The fixing member includes a coupling member having a plurality of protruding portions that can be inserted through the insertion holes and respectively protrude from the end walls so as to be in contact with the main body, and a fixing nut that is engaged with the coupling member in a state in which the fixing nut is allowed to rotate relative to the coupling member and is screwed into the female screw portion on the inner side of the peripheral wall. The fixing nut has an operation end surface exposed to the outside, and the operation end surface is formed with a groove into which a tool can be inserted.

Description

Pressure reducing valve

Technical Field

The present invention relates to a pressure reducing valve.

Background

The pressure reducing valve reduces the pressure of the fluid supplied from the primary-side flow path and guides the pressure to the secondary-side flow path. The pressure reducing valve includes a main body. The main body is provided with a primary side flow path, a secondary side flow path and a pressure reducing valve hole. The relief valve hole communicates the primary flow path with the secondary flow path. The pressure reducing valve includes a pressure reducing valve element, a pressure reducing piston, a pressure reducing spring, and a spring support member. The pressure reducing valve core opens and closes the pressure reducing valve hole. The pressure-reducing piston is movable back and forth in an integral manner with the pressure-reducing valve spool. The pressure reducing piston receives the pressure of the secondary flow path and moves in the direction in which the pressure reducing valve element closes. The pressure reducing spring biases the pressure reducing piston in the valve opening direction of the pressure reducing valve element. The spring support member supports the decompression spring on the opposite side of the decompression piston from the direction of movement of the decompression piston. An internal threaded hole is arranged in the main body.

The pressure reducing valve includes a screw adjusting member and a fixing member. The screw-on adjusting member has an external screw thread portion. The external thread part is screwed with the internal thread hole. The male screw portion abuts against the spring support member. The screw-in adjusting member is screwed in and out of the female screw hole by the male screw portion to adjust the position of the spring supporting member, thereby adjusting the elastic force of the decompression spring. Specifically, the elastic force of the pressure reducing spring is adjusted so that the pressure reducing valve element assumes a valve-closed state when the pressure in the secondary-side flow path reaches the set pressure. When the adjustment of the elastic force of the decompression spring is completed, the screw adjusting member is fixed to the main body by the fixing member. In this way, the pressure reducing valve reduces the pressure of the fluid supplied from the primary-side flow path and guides the fluid to the secondary-side flow path.

Fig. 6 shows a part of a pressure reducing valve 100 of japanese patent application laid-open No. 9-179634, for example. As shown in fig. 6, the screw adjusting member 101 protrudes outward from the main body 102. By performing the tightening operation of the nut 103, that is, screwing the nut 103 as a fixing member onto the screw adjusting member 101 until the nut abuts against the main body 102, the screw adjusting member 101 is fixed to the main body 102 by the nut 103.

Disclosure of Invention

Technical problem to be solved by the invention

In the above publication, the screw adjusting member 101 protrudes from the end surface 103a of the nut 103. Therefore, when tightening the nut 103, it is necessary to perform the tightening operation of the nut 103 by a tool such as a wrench from a direction intersecting a direction of screwing in and out the nut with respect to the female screw hole 104 in the screw adjusting member 101. Therefore, if a sufficient work space cannot be secured in the direction intersecting the direction of screwing in and out with respect to the female screw hole 104 in the screw adjustment member 101, the tightening work of the nut 103 may be difficult. As a result, it is difficult to fix the screw adjusting member 101 to the main body 102, and thus operability is reduced.

When the nut 103 is tightened, the screw adjustment member 101 is displaced when the screw adjustment member 101 rotates together with the nut 103. Since the elastic force of the decompression spring 105 is changed in this way, the pressure of the secondary side flow path cannot be accurately adjusted to the set pressure. Therefore, when the nut 103 is tightened, in order not to rotate the screw adjusting member 101 together with the nut 103, it is necessary to hold the screw adjusting member 101 with a tool or a hand, for example. However, in the structure in which the screw adjustment member 101 protrudes from the end surface 103a of the nut 103, it is difficult to perform the tightening operation of the nut 103 while holding the portion of the screw adjustment member 101 protruding outward from the end surface 103a of the nut 103 with a tool or a hand. Therefore, it is desirable that the screw adjustment member 101 be easily fixed to the main body 102, and that the screw adjustment member 101 be less likely to be displaced, so that the operability be improved and the pressure of the secondary side flow path be accurately adjusted to the set pressure.

Means for solving the technical problems

The pressure reducing valve according to one aspect of the present disclosure includes a main body having a primary side flow path, a secondary side flow path, and a pressure reducing valve hole that communicates the primary side flow path with the secondary side flow path, a pressure reducing valve element that opens and closes the pressure reducing valve hole, a pressure reducing piston that is movable back and forth integrally with the pressure reducing valve element and that moves in a direction in which the pressure reducing valve element closes the pressure reducing valve element by receiving pressure in the secondary side flow path, a spring support member that supports the pressure reducing piston in a direction in which the pressure reducing valve element opens the pressure reducing valve, and a screw hole that is provided in the main body, and a fixing member that adjusts a position of the spring support member to adjust an elastic force of the pressure reducing spring, the screw adjustment member being fixed to the main body, and the pressure reducing valve element being configured to supply the pressure of the fluid from the primary side flow path to the secondary side flow path and to the secondary side flow path. The screw adjusting member has an external screw portion that is screwed into the female screw hole and abuts against the spring supporting member. The position of the spring support member is adjusted by screwing the male screw portion into and out of the female screw hole. The screw adjusting member further includes an end wall and a peripheral wall extending cylindrically from an outer peripheral portion of the end wall, and a female screw portion is formed on an inner peripheral surface of the peripheral wall. The male screw portion is columnar and protrudes from a central portion of a surface of the end wall opposite to the peripheral wall. A plurality of insertion holes are formed around the male screw portion in the end wall. The fixing member includes a coupling member having a plurality of protruding portions that can be inserted through the insertion holes and protrude from the end walls, respectively, so as to be in contact with the main body, and a fixing nut that is engaged with the coupling member in a state in which the fixing nut is allowed to rotate relative to the coupling member, and that is screwed into the female screw portion on the inner side of the peripheral wall. The fixing nut has an operation end surface exposed to the outside as viewed from a direction facing the opening of the peripheral wall, and the operation end surface is formed with a recess into which a tool for screwing in and out the fixing nut with respect to the female screw portion is inserted.

Effects of the invention

According to the present invention, operability can be improved, and the pressure of the secondary side flow path can be accurately adjusted to a set pressure.

Drawings

Fig. 1 is a cross-sectional view showing a solenoid valve manifold of an embodiment.

Fig. 2 is a top view of the solenoid valve manifold of fig. 1.

Fig. 3 is a cross-sectional view showing the pressure reducing valve of fig. 1.

Fig. 4 is a top view of the threaded adjustment member and the retaining nut of fig. 2.

Fig. 5 is a cross-sectional view showing the pressure reducing valve of fig. 1.

Fig. 6 is a sectional view for explaining the prior art.

Detailed Description

An embodiment of the pressure reducing valve will be described below with reference to fig. 1 to 5. The pressure reducing valve of the present embodiment is used to regulate the pressure of fluid output from the solenoid valve. The solenoid valves constitute a solenoid valve manifold.

< integral construction of solenoid valve manifold 10 >

As shown in fig. 1 and 2, the solenoid valve manifold 10 includes a plurality of solenoid valves 11, a plurality of manifold bases 30, a plurality of spacers 40, and a plurality of pressure reducing valves 50. The solenoid valves 11 are arranged side by side in a single direction. The spacer 40 is interposed between the manifold base 30 and the solenoid valve 11. The manifold base 30, the spacers 40, and the pressure reducing valve 50 are arranged in parallel with the solenoid valve 11 in the parallel arrangement direction of the solenoid valve 11, corresponding to the solenoid valve 11. Accordingly, the direction in which the manifold base 30, the spacers 40, and the pressure reducing valve 50 are arranged in parallel corresponds to the direction in which the solenoid valves 11 are arranged in parallel.

< solenoid valve 11 >)

As shown in fig. 1, each solenoid valve 11 has a valve housing 12. The valve housing 12 has a rectangular block shape. The valve housing 12 has a housing main body 13, a 1 st connecting block 14, and a 2 nd connecting block 15. The case main body 13 has a rectangular block shape. The 1 st connecting block 14 is connected to the 1 st end of the case main body 13 in the longitudinal direction. The 2 nd connecting block 15 is connected to the 2 nd end of the case main body 13 in the longitudinal direction. The case main body 13 has a main body opposite surface 13a facing the spacer 40.

The valve housing 12 has a valve bore 16. A valve hole 16 is formed in the case main body 13. The valve hole 16 is circular. The valve hole 16 extends along the longitudinal direction of the case main body 13. The 1 st end of the valve hole 16 opens to the 1 st end surface in the longitudinal direction of the case main body 13. The 2 nd end of the valve hole 16 opens to the 2 nd end surface in the longitudinal direction of the case main body 13. Accordingly, the valve hole 16 penetrates the case main body 13 in the longitudinal direction.

Each solenoid valve 11 has a spool 17. The spool 17 is accommodated in the valve hole 16. The spool 17 is accommodated in the valve hole 16 in a state where the axial direction of the spool 17 coincides with the axial direction of the valve hole 16. The spool 17 is accommodated so as to be movable back and forth in the valve hole 16.

Each solenoid valve 11 has a supply port P, a 1 st output port a, a 2 nd output port B, a 1 st discharge port R1 and a 2 nd discharge port R2. Therefore, each solenoid valve 11 of the present embodiment is a 5-port solenoid valve. The supply port P, the 1 st output port a, the 2 nd output port B, the 1 st discharge port R1 and the 2 nd discharge port R2 are formed in the case main body 13. The supply port P, the 1 st output port a, the 2 nd output port B, the 1 st discharge port R1 and the 2 nd discharge port R2 communicate with the valve hole 16, respectively.

The case main body 13 is arranged in this order from the 1 st end toward the 2 nd end in the longitudinal direction: 1 st discharge port R1, 1 st output port a, supply port P, 2 nd output port B, 2 nd discharge port R2. The 1 st end of each of the supply port P, the 1 st output port a, the 2 nd output port B, the 1 st discharge port R1 and the 2 nd discharge port R2 communicates with the valve hole 16. The 2 nd ends of the supply port P, the 1 st output port a, the 2 nd output port B, the 1 st discharge port R1 and the 2 nd discharge port R2 are opened to the main body opposite surface 13a of the case main body 13.

Each solenoid valve 11 has a 1 st piston 18 and a 2 nd piston 19. The 1 st piston 18 has a disk shape. The 1 st piston 18 is connected to the 1 st end of the spool 17. The 1 st piston 18 moves integrally with the spool 17. The 2 nd piston 19 is disc-shaped. The 2 nd piston 19 is connected to the 2 nd end of the spool 17. The 2 nd piston 19 moves integrally with the spool 17.

The 1 st connecting block 14 is formed with a 1 st piston housing recess 20 having a circular hole shape. The 1 st piston 18 is accommodated in the 1 st piston accommodation recess 20 so as to be movable back and forth. The 1 st pilot pressure acting chamber 21 is partitioned by the 1 st piston housing recess 20 and the 1 st piston 18. The pilot fluid is supplied and discharged in the 1 st pilot pressure application chamber 21.

The 2 nd connecting block 15 is formed with a 2 nd piston housing recess 22 having a circular hole shape. The 2 nd piston housing recess 22 houses the 2 nd piston 19 which can move back and forth. The 2 nd pilot pressure acting chamber 23 is partitioned by the 2 nd piston housing recess 22 and the 2 nd piston 19. In the 2 nd pilot pressure acting chamber 23, pilot fluid is supplied and discharged.

Each solenoid valve 11 includes a 1 st pilot valve V1 and a 2 nd pilot valve V2. Therefore, the solenoid valve 11 is a double-solenoid pilot type solenoid valve. The voltages applied to the 1 st pilot valve V1 and the 2 nd pilot valve V2 are applied by an external control device such as a Programmable Logic Controller (PLC), for example, which is not shown.

The spool 17 can be switched between the 1 st position and the 2 nd position. For example, the voltage is set to be applied to the 1 st pilot valve V1, and the voltage is stopped to be applied to the 2 nd pilot valve V2. In this way, the 1 st pilot valve V1 supplies the compressed fluid from the fluid supply source, not shown, as the pilot fluid to the 1 st pilot pressure acting chamber 21. On the other hand, the pilot fluid in the 2 nd pilot pressure acting chamber 23 is discharged to the atmosphere by the 2 nd pilot valve V2. In this way, the spool 17 moves toward the 2 nd piston housing recess 22. As a result, the spool 17 is switched to the 1 st position, causing the supply port P to communicate with the 1 st output port a, and the 2 nd output port B to communicate with the 2 nd discharge port R2. When the spool 17 is switched in the 1 st position, the supply port P and the 2 nd output port B are blocked, and the 1 st output port a and the 1 st discharge port R1 are also blocked.

Further, for example, the voltage application to the 1 st pilot valve V1 is stopped, and the voltage application to the 2 nd pilot valve V2 is performed. In this way, the compressed fluid from the fluid supply source is supplied as the pilot fluid to the 2 nd pilot pressure acting chamber 23 by the 2 nd pilot valve V2. On the other hand, the pilot fluid in the 1 st pilot pressure acting chamber 21 is discharged to the atmosphere by the 1 st pilot valve V1. In this way, the spool 17 moves toward the 1 st piston housing recess 20. As a result, the spool 17 is switched to the 2 nd position, causing the supply port P to communicate with the 2 nd output port B, and the 1 st output port a to communicate with the 1 st discharge port R1. When the spool 17 is switched to the 2 nd position, the supply port P and the 1 st output port a are blocked, and the 2 nd output port B and the 2 nd discharge port R2 are also blocked.

In this way, the pilot fluid is supplied and discharged to and from the 1 st pilot pressure application chamber 21 by the 1 st pilot valve V1, and the pilot fluid is supplied and discharged to and from the 2 nd pilot pressure application chamber 23 by the 2 nd pilot valve V2. By doing so, the spool 17 is moved back and forth in the valve hole 16 between the 1 st position and the 2 nd position. The spool 17 is switched between the 1 st position and the 2 nd position, whereby the communication between ports can be switched. Fig. 1 shows a state in which the spool 17 is located at the 2 nd position.

< manifold base 30 >)

Each manifold base 30 is rectangular block-shaped. Each manifold base 30 has a mounting surface 30a. The electromagnetic valve 11 is mounted on the mounting surface 30a with the spacer 40 interposed therebetween. The long side direction of each manifold base 30 coincides with the long side direction of the valve housing 12.

Each manifold base 30 has a supply flow path 31, a 1 st output flow path 32, a 2 nd output flow path 33, a 1 st discharge flow path 34, and a 2 nd discharge flow path 35. The supply channel 31, the 1 st output channel 32, the 2 nd output channel 33, the 1 st discharge channel 34, and the 2 nd discharge channel 35 are opened to the mounting surface 30a.

An end of the supply channel 31 opposite to the mounting surface 30a is connected to a fluid supply source, not shown, by a pipe or the like, for example. The end of the 1 st output flow path 32 opposite to the mounting surface 30a and the end of the 2 nd output flow path 33 opposite to the mounting surface 30a are connected to a fluid pressure device, not shown, by pipes or the like, for example. The end of the 1 st discharge passage 34 opposite to the mounting surface 30a and the end of the 2 nd discharge passage 35 opposite to the mounting surface 30a are respectively connected to the atmosphere.

< spacer 40 >)

Each spacer 40 has a rectangular block shape. Each spacer 40 has a 1 st opposing face 40a facing the valve housing 12 and a 2 nd opposing face 40b facing the manifold base 30. The longitudinal direction of each spacer 40 coincides with the longitudinal direction of the valve housing 12.

Each spacer 40 has a mounting face 41. The mounting surface 41 is an end surface located at one end of the spacer 40 in the longitudinal direction. Each spacer has a 1 st supply communication channel 42, a 2 nd supply communication channel 43, a 1 st output communication channel 44, a 2 nd output communication channel 45, a 1 st discharge communication channel 46, and a 2 nd discharge communication channel 47.

In the 1 st supply communication flow path 42, the 1 st end communicates with the supply flow path 31, and the 2 nd end opens at the mounting surface 41. In the 2 nd supply communication flow path 43, the 1 st end communicates with the supply port P, and the 2 nd end opens at the mounting surface 41. The 2 nd supply communication channel 43 is located closer to the 1 st opposing surface 40a than the 1 st supply communication channel 42 is located at the opening of the mounting surface 41.

The 1 st output communication flow path 44 communicates the 1 st output flow path 32 with the 1 st output port a. The 2 nd output communication flow path 45 communicates the 2 nd output flow path 33 with the 2 nd output port B. The 1 st discharge communication flow path 46 communicates the 1 st discharge flow path 34 with the 1 st discharge port R1. The 2 nd discharge communication flow path 47 communicates the 2 nd discharge flow path 35 with the 2 nd discharge port R2.

The solenoid valve manifold 10 includes a 1 st seal member 48 and a 2 nd seal member 49. The 1 st seal member 48 seals between the spacer 40 and the manifold base 30. The 1 st seal member 48 is a sheet-like gasket, for example. The 2 nd sealing member 49 seals between the spacer 40 and the valve housing 12. The 2 nd seal member 49 is a sheet-like gasket, for example.

< pressure relief valve 50 >)

Each pressure reducing valve 50 includes a main body 51. The main body 51 has a main body 52. The main body 52 has a rectangular block shape. The main body 52 has a 1 st surface 52a, a 2 nd surface 52b, and a connecting surface 52c. The 1 st surface 52a is a surface located at one end of the main body 52 in the longitudinal direction. The 2 nd surface 52b is a surface located at the other end of the main body 52 in the longitudinal direction. The connection surface 52c is a surface that connects the 1 st surface 52a and the 2 nd surface 52b and extends in the longitudinal direction and the width direction of the main body 52.

Each body 51 is mounted to each spacer 40. Specifically, each main body 51 is attached to the attachment surface 41 of each spacer 40 with the 1 st surface 52a of the main body 52 facing the attachment surface 41 of each spacer 40. As shown in fig. 2, the manifold bases 30, the spacers 40, and the pressure reducing valves 50 are arranged in parallel in the direction in which the solenoid valves 11 are arranged in parallel, corresponding to the solenoid valves 11 arranged in parallel, respectively. The width direction of each main body 52 coincides with the side-by-side arrangement direction of the solenoid valves 11. The width direction of each main body 52 is indicated by an arrow X1 in fig. 2.

As shown in fig. 1, the main body 51 has a primary flow path 53, a secondary flow path 54, and a relief valve hole 55. The primary flow path 53 and the secondary flow path 54 penetrate the main body 52 in the longitudinal direction thereof. The primary side flow path 53 and the secondary side flow path 54 are open to the 1 st surface 52a and the 2 nd surface 52b, respectively. The secondary side flow path 54 is located closer to the connection surface 52c than the primary side flow path 53. The primary side flow path 53 communicates with the 1 st supply communication flow path 42. The secondary side flow path 54 communicates with the 2 nd supply communication flow path 43. The end of the primary flow path 53 opposite to the 1 st supply communication flow path 42 and the end of the secondary flow path 54 opposite to the 2 nd supply communication flow path 43 are closed by a closing member 56. The closing member 56 forms a part of the main body 51.

As shown in fig. 3, a relief valve hole 55 is formed in the main body 52. The relief valve hole 55 communicates the primary flow path 53 with the secondary flow path 54. The main body 52 has a valve seat 57. The valve seat 57 is formed on the main body 52 around a portion that opens to the primary flow path 53 of the relief valve hole 55.

Pressure relief valve 50 includes pressure relief valve element 58. Relief valve element 58 opens and closes relief valve orifice 55. Relief valve element 58 is disposed in primary flow path 53. Relief valve element 58 moves back and forth in directions to contact and separate from valve seat 57. Pressure relief valve element 58 is integrally formed by lining a metal spring bearing with rubber. Pressure relief valve element 58 is housed in main body 52 through a hole 59 that opens to a surface of main body 52 opposite to connection surface 52c. The hole 59 is sealed by a plug 60.

Relief valve element 58 is separated from valve seat 57 and is in an open state. The pressure reducing valve element 58 is opened to allow communication between the primary flow path 53 and the secondary flow path 54 through the pressure reducing valve hole 55. On the other hand, relief valve element 58 seats against valve seat 57 to assume a valve-closed state. By the pressure reducing valve element 58 being in the valve-closed state, communication between the primary side flow path 53 and the secondary side flow path 54 through the pressure reducing valve hole 55 is blocked.

The pressure reducing valve 50 has a return spring 61. A return spring 61 is interposed between pressure relief valve element 58 and bolt 60. The return spring 61 biases the pressure-reducing valve element 58 toward the valve seat 57. Therefore, return spring 61 biases pressure-reducing valve element 58 in the direction in which pressure-reducing valve element 58 closes.

The main body 52 has a piston receiving hole 62. The 1 st end of the piston housing hole 62 opens to the connection surface 52c of the main body 52. The 2 nd end of the piston housing hole 62 communicates with the secondary side flow path 54. The axis of the piston housing hole 62 coincides with the axis of the relief valve hole 55.

The pressure reducing valve 50 includes a pressure reducing piston 63. The decompression piston 63 is accommodated in the piston accommodation hole 62. The pressure reducing piston 63 is movable back and forth in the piston housing hole 62. The pressure reducing piston 63 has a piston body 64 and a piston shaft 65. The piston shaft portion 65 protrudes from an end surface of the piston main body portion 64 facing the secondary side flow path 54. The tip end of piston shaft 65 passes through the inside of relief valve hole 55 and abuts relief valve element 58. Pressure reducing piston 63 moves back and forth integrally with pressure reducing valve element 58 with the tip of piston shaft 65 abutting pressure reducing valve element 58. The end surface of the piston body 64 facing the secondary flow path 54 is a pressure receiving surface 63a that receives the pressure of the secondary flow path 54. Pressure reducing piston 63 moves back and forth integrally with pressure reducing valve element 58 and receives the pressure of secondary-side flow path 54, thereby moving in the direction in which pressure reducing valve element 58 closes the valve. The space between the piston body 64 and the piston housing hole 62 is sealed by a gasket 66.

The main body 51 has a case 67. The case 67 has a circular plate-shaped case end wall 68 and a cylindrical case peripheral wall 69. The case peripheral wall 69 extends cylindrically from the outer peripheral portion of the case end wall 68. The case 67 has a flange 70. A flange 70 projects outwardly from an end of the case peripheral wall 69 opposite to the case end wall 68. The flange 70 is annular. The case 67 is mounted on the connection surface 52c by screwing a screw 71 penetrating the flange 70 into the main body 52. The inside of the case peripheral wall 69 communicates with the piston housing hole 62. The case 67 is attached to the connection surface 52c of the main body 52 in a state where the axis of the case peripheral wall 69 coincides with the axis of the piston housing hole 62.

The case 67 has a fitting recess 72. The fitting recess 72 is formed in an end face of the case end wall 68 on the opposite side of the case peripheral wall 69. The fitting recess 72 is circular. The case 67 has a through hole 73. The through hole 73 is formed in the bottom surface of the fitting recess 72. The axis of the through hole 73 coincides with the axis of the fitting recess 72. The through hole 73 communicates the inside of the fitting recess 72 with the inside of the case peripheral wall 69. The axis of the through hole 73 coincides with the axis of the case peripheral wall 69.

A nut 74 is fitted into the fitting recess 72. Accordingly, the case 67 is provided with a nut 74. The nut 74 forms a part of the body 51. Nut 74 has an internally threaded bore 75. Accordingly, the pressure reducing valve 50 includes the female screw hole 75 provided in the main body 51. The nut 74 is fitted into the fitting recess 72 in a state where the axis of the female screw hole 75 coincides with the axis of the through hole 73.

The relief valve 50 has a relief spring 76. The decompression spring 76 is housed inside the case 67. Relief spring 76 biases relief piston 63 toward relief valve element 58. Pressure reducing valve element 58 is pressed when pressure reducing piston 63 moves toward pressure reducing valve element 58 by receiving the urging force of pressure reducing spring 76. Thus, relief valve element 58 moves away from valve seat 57. As a result, pressure relief valve element 58 is brought into the open valve state. Accordingly, pressure relief spring 76 biases pressure relief piston 63 in the direction in which pressure relief valve element 58 opens the valve.

The pressure reducing valve 50 includes a spring support member 77. The spring support member 77 has a disk shape. The spring support member 77 is housed inside the case 67. The spring support member 77 can move back and forth inside the case 67. Inside the case 67, a spring support member 77 is disposed closer to the case end wall 68 than the pressure-reducing piston 63. The spring support member 77 supports the decompression spring 76. The 1 st end of the decompression spring 76 is supported by a spring support member 77. The 2 nd end of the decompression spring 76 is supported by the decompression piston 63. Accordingly, the spring support member 77 supports the decompression spring 76 on the opposite side of the decompression piston 63 in the moving direction of the decompression piston 63.

The pressure reducing valve 50 includes a screw adjusting member 78. The screw adjustment member 78 has an end wall 79 and a peripheral wall 80. The end wall 79 is disc-shaped. The peripheral wall 80 extends cylindrically from the outer peripheral portion of the end wall 79. A female screw portion 81 is formed on the inner peripheral surface of the peripheral wall 80. The internally threaded portion 81 extends from the open end of the peripheral wall 80 to a position proximal to the end wall 79. Therefore, substantially all of the inner peripheral surface of the peripheral wall 80 becomes the female screw portion 81.

The screw adjusting member 78 has an external threaded portion 82. The male screw 82 has a cylindrical shape. The male screw 82 protrudes from a central portion of the surface of the end wall 79 opposite to the peripheral wall 80. The male screw 82 is screwed into the female screw hole 75 of the nut 74. The distal end portion of the male screw portion 82 protrudes into the case 67 through the female screw hole 75 and the through hole 73. The tip of the male screw 82 abuts against the spring support member 77. Accordingly, the male screw 82 is screwed into the female screw hole 75 and abuts against the spring support member 77.

The screw adjustment member 78 is screwed into and out of the female screw hole 75 by the male screw portion 82, thereby adjusting the position of the spring support member 77. Specifically, when the screw adjustment member 78 is rotated in the forward direction, the male screw portion 82 is screwed into the female screw hole 75. Then, the spring support member 77 is pressed by the male screw portion 82 screwed into the female screw hole 75, so that the spring support member 77 is moved toward the pressure reducing piston 63. In this way, since the distance between the spring support member 77 and the decompression piston 63 is reduced, the elastic force of the decompression spring 76 increases by the compression of the decompression spring 76.

On the other hand, for example, when the screw adjusting member 78 is rotated in the opposite direction, the male screw 82 is screwed out of the female screw hole 75. Then, the spring support member 77 is moved in a direction away from the decompression piston 63 by the decompression spring 76 being stretched. In this way, since the distance between the spring support member 77 and the decompression piston 63 increases, the elastic force of the decompression spring 76 decreases by the extension of the decompression spring 76.

As described above, the elastic force of the decompression spring 76 is adjusted by adjusting the position of the spring support member 77. Accordingly, the screw adjusting member 78 adjusts the elastic force of the decompression spring 76. By adjusting the elastic force of the relief spring 76, the urging force of the relief spring 76 urging the relief piston 63 in the valve opening direction of the relief valve element 58 is adjusted.

A plurality of insertion holes 83 are formed in the end wall 79. The end wall 79 in the present embodiment is formed with 2 insertion holes 83.2 insertion holes 83 are formed around the male screw portion 82 in the end wall 79. Each insertion hole 83 penetrates the end wall 79 in the thickness direction.

As shown in fig. 3 and 4, an insertion groove 84 is formed in an opening end surface of the peripheral wall 80. As shown in fig. 4, the opening end face of the peripheral wall 80 is formed with 2 insertion grooves 84. On the opening end face of the peripheral wall 80, 2 insertion grooves 84 are arranged 180 degrees apart in the circumferential direction of the peripheral wall 80. Each insertion groove 84 connects the outer peripheral surface of the peripheral wall 80 and the inner peripheral surface of the peripheral wall 80, and extends straight along the central axis of the peripheral wall 80.

As shown by the two-dot chain line in fig. 4, the insertion groove 84 is capable of insertion of a tool 85. The tool 85 is for example a flat head screwdriver. The front end of the flat head screwdriver is inserted into the insertion groove 84 and the screw adjusting member 78 is rotated by the flat head screwdriver, thereby screwing the external screw portion 82 in and out with respect to the internal screw hole 75. Therefore, the insertion groove 84 allows insertion of a tool 85 for screwing in and out the male screw 82 with respect to the female screw hole 75.

As shown in fig. 3, the pressure reducing valve 50 includes a fixing member 86. The fixing member 86 includes a coupling member 87 and a fixing nut 88.

The connecting member 87 has a flat plate portion 89, a plurality of protruding portions 90, a connecting portion 91, and a locking portion 92. The coupling member 87 in the present embodiment has 2 protruding portions 90. Each of the protruding portions 90 has a columnar shape. Each protruding portion 90 protrudes from the flat plate portion 89. The plurality of projections 90 extend parallel to each other. The front end surface of each protruding portion 90 is flat.

The connection portion 91 has a columnar shape. The connection portion 91 protrudes from a central portion of a surface of the flat plate portion 89 opposite to the protruding portion 90. The locking portion 92 is connected to an end portion of the connecting portion 91 opposite to the flat plate portion 89. The locking portion 92 is a circular plate and extends parallel to the flat plate portion 89. The axis of the connecting portion 91 coincides with the center of the locking portion 92. The connecting portion 91 and the locking portion 92 are formed in a T-shape in cross section as a whole.

The fixing nut 88 has a cylindrical shape. The outer peripheral surface of the fixing nut 88 is an external thread that can be screwed with the internal thread 81. The fixing nut 88 is screwed with the female screw portion 81 inside the peripheral wall 80 of the screw adjusting member 78.

The fixing nut 88 has a locking groove 93. The locking groove 93 opens to the 1 st end surface of the fixing nut 88 and also opens to the outer peripheral surface of the fixing nut 88. The locking groove 93 is formed by a narrow groove 93a and a wide groove 93b.

The connecting portion 91 and the locking portion 92 are slidably inserted into the locking groove 93 through an opening formed in the outer peripheral surface of the fixing nut 88. Specifically, the connection portion 91 is slidably inserted into the narrow groove 93a, and the locking portion 92 is slidably inserted into the wide groove 93b. The locking portion 92 is locked to the inner surface of the wide groove 93b. The fixing nut 88 is engaged with the coupling member 87 in a state of being allowed to rotate relative to the coupling member 87. Each protruding portion 90 is inserted into the corresponding insertion hole 83. The coupling member 87 is movable integrally with the fixing nut 88 by screwing in and out the fixing nut 88 with respect to the female screw portion 81. The plurality of protruding portions 90 can protrude from the end wall 79 of the screw adjustment member 78 and abut against the main body 51. Each of the protruding portions 90 can be in surface contact with the main body 51. Specifically, the tip of each projection 90 can be in surface contact with a portion of the outer surface of the case end wall 68 and a portion of the end surface of the nut 74.

As shown in fig. 3 and 4, the fixing nut 88 has an operation end surface 88a exposed to the outside as viewed from the direction facing the opening of the peripheral wall 80, and a groove 94 is formed in the operation end surface 88 a. The groove 94 extends straight in the radial direction of the fixing nut 88. Both end portions of the groove 94 are each opened toward the outer peripheral surface of the fixing nut 88.

As shown by the two-dot chain line in fig. 4, the groove 94 is capable of being inserted by a tool 95. The tool 95 is for example a flat head screwdriver. The front end of the flat head screwdriver is inserted into the groove 94 to rotate the fixing nut 88 using the flat head screwdriver, thereby screwing in and unscrewing the fixing nut 88 with respect to the female screw portion 81. Thus, the groove 94 allows insertion of a tool 95 for screwing in and out the fixing nut 88 with respect to the female screw portion 81. As shown in fig. 3 and 5, the fixing nut 88 is disposed inside the peripheral wall 80 such that the operation end surface 88a is closer to the end wall 79 than the insertion grooves 84.

The fixing member 86 fixes the screw adjusting member 78 to the main body 51. Specifically, each protruding portion 90 is brought into contact with the main body 51, whereby each protruding portion 90 presses the main body 51 in a state of being in surface contact with the main body 51. The rotation of the screw adjusting member 78 is restricted by the pressing force of each protruding portion 90 against the main body 51. In this way, the screw adjusting member 78 is fixed to the main body 51 by the fixing nut 88 and the coupling member 87 in a state in which the screwing in and out of the male screw portion 82 with respect to the female screw hole 75 is restricted.

The pressure reducing valve 50 is provided with a pressure gauge 96. The pressure gauge 96 detects the pressure of the secondary side flow path 54. The pressure gauge 96 is provided on the connection surface 52c of the main body 52. Therefore, a pressure gauge 96 for detecting the pressure of the secondary-side flow path 54 is provided on the connection surface 52c. The main body 52 has a mounting hole 97 for mounting the pressure gauge 96. The 1 st end of the mounting hole 97 is open to the connection surface 52c. The 2 nd end of the mounting hole 97 communicates with the secondary-side flow path 54. The detection portion of the pressure gauge 96 passes through the mounting hole 97 to be exposed to the secondary side flow path 54. A part of the pressure gauge 96 protrudes outward from the mounting hole 97. Thus, the pressure gauge 96 protrudes from the connection surface 52c.

When viewed from above from the side facing the connection surface 52c, the pressure gauge 96 is disposed on the connection surface 52c in close proximity to the screw adjustment member 78 in the longitudinal direction of the main body 52. Therefore, when viewed from above from the side facing the connection surface 52c, the screw adjustment member 78 is disposed on the connection surface 52c in close proximity to the pressure gauge 96 in the longitudinal direction of the main body 52.

< action >

Next, the operation of the present embodiment will be described.

When the pressure of the secondary side flow path 54 is lower than the set pressure, the pressure reducing spring 76 presses the pressure reducing piston 63 against the pressure of the secondary side flow path 54 acting on the pressure receiving surface 63a of the pressure reducing piston 63. In this way, relief valve element 58 moves away from valve seat 57. As a result, pressure relief valve element 58 is brought into the open valve state. When the pressure reducing valve element 58 is in the open state, the fluid from the supply passage 31 is supplied to the supply port P through the 1 st supply communication passage 42, the primary side passage 53, the pressure reducing valve hole 55, and the secondary side passage 54. Thus, the supply flow path 31 supplies fluid to the supply port P.

When fluid flows from the primary flow path 53 through the relief valve hole 55 to the secondary flow path 54, the pressure of the secondary flow path 54 gradually increases. In addition, the pressure acting on the pressure receiving surface 63a of the pressure reducing piston 63 increases, so that the pressure reducing piston 63 moves toward the spring supporting member 77. Further, pressure reducing valve element 58 receives the biasing force of return spring 61 and moves toward valve seat 57. Then, when the pressure in the secondary flow path 54 reaches the set pressure, the pressure reducing valve element 58 seats on the valve seat 57 to be in a valve-closed state. In this way, the pressure of the secondary side flow path 54 is set to the set pressure.

When the spool 17 is switched to the 1 st position, the fluid supplied to the supply port P is output to the fluid pressure device through the 1 st output port a, the 1 st output communication flow path 44, and the 1 st output flow path 32. Then, the pressure fluid from the fluid pressure device passes through the 2 nd output flow path 33, the 2 nd output communication flow path 45, the 2 nd output port B, the 2 nd discharge port R2, the 2 nd discharge communication flow path 47, and the 2 nd discharge flow path 35, and is discharged to the outside.

On the other hand, when the spool 17 is switched to the 2 nd position, the fluid supplied to the supply port P is output to the fluid pressure device through the 2 nd output port B, the 2 nd output communication flow path 45, and the 2 nd output flow path 33. Then, the fluid from the fluid pressure device passes through the 1 st output flow path 32, the 1 st output communication flow path 44, the 1 st output port a, the 1 st discharge port R1, the 1 st discharge communication flow path 46, and the 1 st discharge flow path 34, and is discharged to the outside.

The pressure reducing valve 50 reduces the pressure of the fluid supplied from the primary flow path 53 and guides the fluid to the secondary flow path 54. In this way, the fluid output from the solenoid valve 11 is regulated by the pressure reducing valve 50 to be reduced to the set pressure. As described above, the pressure reducing valve 50 reduces the pressure of the fluid output from the solenoid valve 11 to the set pressure.

< operation of adjusting the elastic force of the decompression spring 76 >)

The operator performs an operation of adjusting the elastic force of the relief spring 76 so that the relief valve element 58 assumes a valve-closed state when the pressure of the secondary-side flow path 54 becomes the set pressure. Specifically, as shown in fig. 5, the tool 85 is first inserted into the insertion groove 84 in a state where each protruding portion 90 is separated from the main body 51. The screw adjustment member 78 is then rotated by the tool 85. In this way, the male screw 82 is screwed into and out of the female screw hole 75. As a result, the elastic force of the decompression spring 76 is adjusted by adjusting the position of the spring support member 77.

Such an adjustment operation, in which the elastic force of the decompression spring 76 is set by the operator, is performed by the operator by rotating the screw adjustment member 78 while checking the pressure detected by the pressure gauge 96. In this way, the pressure reducing valve 50 reduces the pressure of the secondary side flow path 54, and the pressure detected by the pressure gauge 96 is set to the set pressure, thereby reducing the pressure of the fluid output from the solenoid valve 11.

Next, the operator performs a tightening operation of the fixing member 86. Specifically, the peripheral wall 80 of the screw adjusting member 78 is first held by a tool or a hand from the outside. In this state, the tool 95 is inserted into the groove 94 of the fixing nut 88. Then, the fixing nut 88 is screwed into the female screw portion 81 by the tool 95. At this time, the fixing nut 88 is engaged with the coupling member 87 in a state of being allowed to rotate relative to the coupling member 87. In this way, the coupling member 87 moves toward the main body 51 together with the fixing nut 88 while being guided into the insertion hole 83 corresponding to each of the protruding portions 90.

As shown in fig. 3, each protruding portion 90 is brought into surface contact with the main body 51 by the contact of each protruding portion 90 with the main body 51. Then, the rotation of the screw adjusting member 78 is restricted by the pressing force of each protruding portion 90 against the main body 51. Thereby, the screw adjusting member 78 is fixed to the main body 51 by the fixing nut 88 and the connecting member 87. By performing the fastening operation of the fixing member 86 as described above, the screw adjusting member 78 can be fixed to the main body 51 without shifting the position of the screw adjusting member 78.

< Effect >

The above embodiment can obtain the following effects.

(1) The fixing nut 88 can be screwed into and out of the female screw portion 81 by a tool 95 inserted into a groove 94 formed in the operation end surface 88a of the fixing nut 88. Therefore, the fastening operation of the fixing member 86 can be performed from the same direction as the screwing-in and unscrewing direction of the male screw portion 82 of the screw adjusting member 78 with respect to the female screw hole 75. The fastening operation of the fixing member 86 is performed in a direction that does not need to intersect with the direction of screwing in and out the male screw portion 82 of the screw adjustment member 78 with respect to the female screw hole 75 as in the conventional art. Therefore, even in an environment where a sufficient working space cannot be secured in a direction in which the male screw portion 82 of the screw adjustment member 78 intersects with the direction in which the female screw hole 75 is screwed in and out, the screw adjustment member 78 can be easily fixed to the main body 51. Thus, operability is improved.

Further, since the fixing nut 88 is screwed to the female screw portion 81 on the inner side of the peripheral wall 80, the fixing nut 88 can be easily screwed into and out of the female screw portion 81 by the tool 95 in a state where the peripheral wall 80 is held by the tool or the hand from the outside. Therefore, the problem of the screw adjusting member 78 rotating together with the fixing nut 88 can be simply avoided. Therefore, the screw adjusting member 78 is not easily displaced. In this way, the operability can be improved, and the pressure of the secondary side flow path 54 can be accurately adjusted to the set pressure.

(2) The fixing nut 88 is disposed inside the peripheral wall 80 such that the operation end surface 88a is closer to the end wall 79 than the insertion grooves 84. In this way, the problem of the tool 85 interfering with the fixing nut 88 when the tool 85 is inserted into the insertion groove 84 to screw in and out the male screw portion 82 with respect to the female screw hole 75 can be avoided.

(3) When the plurality of pressure reducing valves 50 are arranged side by side in the side-by-side arrangement direction of the solenoid valves 11 corresponding to the plurality of solenoid valves 11 arranged side by side, a sufficient working space cannot be ensured in the direction in which the male screw portion 82 of the screw adjusting member 78 intersects the direction in which the female screw hole 75 is screwed in and out. However, even in this case, according to the present embodiment, since the screw adjusting member 78 can be easily fixed to the main body 51, operability is improved.

< variant >

The above embodiment may be modified as follows. The above-described embodiments and the following modifications can be combined with each other within a range that is not technically contradictory.

In the embodiment, for example, the outer peripheral surface of the peripheral wall 80 of the screw adjustment member 78 may be formed to have a pair of planar surfaces. Further, for example, the screw adjusting member 78 may be rotated by a wrench by being fitted to a pair of flat surfaces. In this case, the insertion channel 84 into which the tool 85 can be inserted may not be formed at the opening end surface of the peripheral wall 80. For example, as long as the insertion channel 84 is not formed on the opening end surface of the peripheral wall 80, the fixing nut 88 does not need to be disposed inside the peripheral wall 80 such that the operation end surface 88a is closer to the end wall 79 than the insertion channel 84.

In the embodiment, for example, the screw adjusting member 78 may have a knurled surface on the outer peripheral surface thereof. Further, the screw adjustment member 78 may be rotated by an operator holding the knurled surface with his or her hand. In this case, the insertion channel 84 into which the tool 85 can be inserted may not be formed at the opening end surface of the peripheral wall 80.

In the embodiment, the concave portion 94 may not extend straight in the radial direction of the fixing nut 88, and may have a hexagonal hole shape, for example. The fixing nut 88 can be screwed into and out of the female screw portion 81 by inserting the tip of a hexagonal wrench into the recess 94 and rotating the fixing nut 88 by the hexagonal wrench.

In the embodiment, the number of the protruding portions 90 is not particularly limited. The number of insertion holes 83 may be appropriately changed in accordance with the number of the protruding portions 90.

In the embodiment, the nut 74 may not be provided in the case 67. Further, for example, an internally threaded hole 75 may be formed in the case end wall 68 of the case 67. That is, the pressure reducing valve 50 may be configured to have the female screw hole 75 provided in the main body 51.

In the embodiment, the pressure reducing valve 50 is not limited to the structure in which the pressure gauge 96 is disposed on the connection surface 52c in the state of being in close proximity to the screw adjustment member 78 in the longitudinal direction of the main body 52.

In the embodiment, the solenoid valve manifold 10 may omit the spacer 40, for example. In short, the pressure reducing valve 50 is not particularly limited as long as it is configured to reduce the pressure of the fluid supplied from the primary side flow path 53 and to lead the fluid to the secondary side flow path 54, so that the pressure of the fluid output from the solenoid valve 11 can be reduced to a set pressure.

In the embodiment, the solenoid valve 11 is a double-solenoid pilot type solenoid valve, but the present invention is not limited to this, and for example, a single-solenoid pilot type solenoid valve having only 1 pilot valve may be mounted.

In the embodiment, the solenoid valve 11 may omit, for example, a 4-port solenoid valve of the 2 nd discharge port R2. In short, the solenoid valve 11 may have at least 1 discharge port. The solenoid valve 11 may have a 3-port solenoid valve having a supply port, an output port, and a discharge port.

Description of the reference numerals

50 relief pressure valve

51 main body

53 primary side flow path

54 secondary side flow path

55 decompression valve hole

58 relief pressure case

63 decompression piston

75 internal threaded hole

76 decompression spring

77 spring support member

78 screw-on adjusting member

79 end wall

80 peripheral wall

81 female screw portion

82 external screw thread portion

83 insertion hole

84 inserting groove

85 tool

86 fixing member

87 connecting member

88 fixing nut

88a operating end face

90 projection

94 groove

Claims (2)

1. A pressure reducing valve is characterized by comprising a main body, a pressure reducing valve core, a pressure reducing piston, a pressure reducing spring, a spring supporting member, an internal threaded hole, a screw adjusting member and a fixing member,

the main body has a primary side flow path, a secondary side flow path, and a pressure reducing valve hole for communicating the primary side flow path with the secondary side flow path,

the pressure reducing valve core opens and closes the pressure reducing valve hole,

the pressure reducing piston is movable back and forth in a manner integral with the pressure reducing valve element and is movable in a direction in which the pressure reducing valve element closes by receiving the pressure of the secondary side flow path,

the pressure reducing spring applies force to the pressure reducing piston in the valve opening direction of the pressure reducing valve core,

the spring support member supports the relief spring on a side opposite to the relief piston in a moving direction of the relief piston,

the internally threaded bore is disposed in the body,

the screw adjusting member adjusts the position of the spring supporting member to adjust the elastic force of the pressure reducing spring,

the fixing member fixes the screw adjusting member to the main body,

the pressure reducing valve reduces the pressure of the fluid supplied from the primary side flow path and guides the pressure to the secondary side flow path,

the screw-fit adjusting member has an external screw thread portion screwed with the internal screw hole and abutting against the spring supporting member,

by screwing in and unscrewing the external screw thread portion with respect to the internal screw thread hole, the position of the spring supporting member is adjusted,

the screw adjusting member further has an end wall and a peripheral wall extending cylindrically from an outer peripheral portion of the end wall,

an internal thread portion is formed on an inner peripheral surface of the peripheral wall,

the external thread part is columnar and protrudes from the center part of the surface of the end wall opposite to the peripheral wall,

a plurality of insertion holes are formed around the male screw portion in the end wall,

the fixing member includes a connecting member and a fixing nut,

the connecting member has a plurality of protruding portions that are capable of being inserted through the insertion holes and respectively protruding from the end walls to abut against the main body,

the fixing nut is locked with the connecting member in a state of being allowed to rotate relative to the connecting member, and is screwed with the internal thread part at the inner side of the peripheral wall,

the fixing nut has an operation end surface exposed to the outside as viewed from a direction facing the opening of the peripheral wall, and a recess is formed in the operation end surface into which a tool for screwing in and out the fixing nut with respect to the female screw portion is inserted.

2. A pressure reducing valve according to claim 1, wherein,

an insertion groove into which a tool for screwing in and out the male screw portion with respect to the female screw hole is inserted is formed in an opening end surface of the peripheral wall,

the fixing nut is disposed inside the peripheral wall such that the operation end surface is closer to the end wall than the insertion groove.