CN112833225A

CN112833225A - Swing check valve

Info

Publication number: CN112833225A
Application number: CN202110301178.XA
Authority: CN
Inventors: 李新顶; 贾伟; 曹德胜; 洪振坤
Original assignee: Shanghai Eho Valve Co ltd
Current assignee: Shanghai Eho Valve Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-05-25

Abstract

The invention discloses a swing check valve, which comprises a valve body, wherein an inlet flow passage and an outlet flow passage are arranged in the valve body, a valve seat is arranged at the outlet end of the inlet flow passage in the valve body, a valve clack matched with the valve seat is arranged in the valve body, a valve cover is arranged at the top of the valve body, a wedge-shaped sealing groove is formed between the edge of the upper part of the valve cover and the inner wall of the valve body, a sealing ring matched with the sealing groove is arranged in the wedge-shaped sealing groove, and the sealing ring is locked to the valve cover through a; a support ring is arranged below the valve cover, the support ring is rotatably connected with the end part of a swing rod through a pin shaft, and the swing rod is connected to the valve clack and drives the valve clack to rotate to open and close; and the outlet end of the inlet flow passage in the valve body is obliquely provided with a valve seat groove, and the valve seat is arranged in the valve seat groove. The valve cover is matched and sealed with the wedge-shaped structure of the sealing ring, the higher the pressure is, the better the sealing performance is, and the valve cover is suitable for high-pressure occasions.

Description

Swing check valve

Technical Field

The invention relates to a valve, in particular to a swing check valve.

Background

The existing swing check valve has the following defects: 1. the middle flange sealing structure is generally adopted, a middle flange flat gasket is adopted as a sealing element in the structure, and the sealing performance is good under the working condition of middle and low pressure. However, under the high-pressure working condition, in order to ensure the sealing of the middle flange, the gasket of the middle flange needs to be widened, so that the middle flange of the valve is enlarged, the whole size of the valve is enlarged, and the whole weight is heavy. For the valve with the nominal pressure exceeding 2500Lb, a middle flange sealing structure is adopted, and even if the width of the gasket is increased, the sealing at the middle flange is difficult to ensure; 2. the rocker arm pin shaft is generally assembled in a mode of opening a valve body, so that outer leakage points are increased; or the hook is installed by casting the boss on the body, the hook is connected with the valve body through a bolt, the rocker arm and the pin shaft are connected to the valve body through the hook, and the assembly precision of the rocker arm and the pin shaft can be influenced due to the fact that the hook is fastened with the valve body through the bolt, and therefore the closing precision of the valve clack is influenced; 3. when the valve seat and the valve clack sealing surface work, a certain included angle is formed between the valve seat and the valve clack sealing surface and the vertical axis of the valve, and the included angle can enable the self weight of the valve clack to generate a horizontal component force to push the valve clack to the valve seat to generate initial sealing pressure; the mounting groove of the valve seat of the existing valve body is not provided with an inclination usually, but the sealing surface of the valve seat is provided with an inclination, and the shortest side of the valve seat is required to be welded on the valve body when the valve seat is assembled, so that the valve is required to be positioned at the highest point, otherwise, the valve cannot be sealed, and the assembly difficulty is high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a swing check valve which is provided with a wedge-shaped sealing structure and is suitable for high-pressure working conditions.

The technical scheme adopted by the invention for solving the technical problems is to provide a swing check valve, which comprises a valve body, wherein an inlet flow passage and an outlet flow passage are arranged in the valve body, a valve seat is arranged at the outlet end of the inlet flow passage in the valve body, and a valve clack matched with the valve seat is arranged in the valve body; a support ring is arranged below the valve cover, the support ring is rotatably connected with the end part of a swing rod through a pin shaft, and the swing rod is connected to the valve clack and drives the valve clack to rotate to open and close; and the outlet end of the inlet flow passage in the valve body is obliquely provided with a valve seat groove, and the valve seat is arranged in the valve seat groove.

Further, locking structure includes clamping ring, four ring-opening and apron, the clamping ring sets up in the sealing washer top, clamping ring upper surface and valve gap upper surface parallel and level, four ring-opening sets up the top at the clamping ring, the valve body inner wall is provided with the mounting groove that matches with four ring-opening, four ring-opening side-in inlays and establishes in the mounting groove, the apron sets up four ring-opening's top, be provided with the double-screw bolt in the apron, the double-screw bolt runs through the apron is connected to the valve gap.

Furthermore, the valve cover is integrally cylindrical, the diameter of the bottom of the valve cover is larger than that of the top of the valve cover, the middle part of the valve cover, which is connected with the bottom and the top of the valve cover, is in a circular truncated cone shape, the diameter of the bottom of the valve cover is matched with the inner diameter of the top of the valve body, and when the valve cover is arranged in the valve body, a wedge-shaped sealing groove is formed between the upper part of the valve cover and the inner; the sealing ring is annular, the outer diameter of the sealing ring is matched with the diameter of the bottom of the valve cover, the inner diameter of the sealing ring is matched with the diameter of the top of the valve cover, and the inner wall of the lower part of the sealing ring is in a circular truncated cone shape matched with the middle of the valve cover; the sealing ring is made of flexible graphite and stainless steel wires.

Furthermore, the compression ring is annular, the outer diameter of the compression ring is matched with the outer diameter of the bottom of the valve cover, and the inner diameter of the compression ring is matched with the outer diameter of the top of the valve cover; the arc piece that four ring-opening are formed for being divided into four postprocessing by a integer, the external diameter of four ring-opening is greater than valve gap bottom external diameter, the internal diameter of four ring-opening slightly is greater than the top external diameter of valve gap and is less than the bottom external diameter of valve gap, the high and four ring-opening's of mounting groove highly match, the internal diameter of mounting groove matches with four ring-opening's external diameter, four ring-opening are two and relative setting in the mounting groove, and will sealing washer and clamping ring location.

Furthermore, a positioning groove matched with the four open rings is formed in the bottom surface of the cover plate; the valve gap top surface is provided with the internal thread hole that matches with the double-screw bolt, be provided with the stud hole that link up on the apron, the stud hole corresponds the setting with the internal thread hole of valve gap, the double-screw bolt passes the stud hole passes through internal thread jogged joint with the valve gap.

Furthermore, a through dismounting hole is formed in the side wall of the valve body corresponding to the mounting groove.

Further, a split ring is arranged above the support ring, a fixing groove matched with the split ring is formed in the inner wall of the valve body, the split ring is embedded in the fixing groove from the side face to fix the support ring, and a positioning pin is arranged below the support ring and connected to the valve body for positioning.

Furthermore, the outer diameter of the top of the support ring is larger than that of the bottom of the support ring, an installation step is formed on the outer wall of the support ring, an installation boss matched with the installation step is arranged on the inner wall of the valve body, and the support ring is arranged on the installation boss; the split ring is an arc-shaped block which is formed by dividing a whole ring into two parts and then processing the two parts, the outer diameter of the split ring is larger than the outer diameter of the top of the support ring, and the inner diameter of the split ring is larger than the inner diameter of the support ring and smaller than the outer diameter of the bottom of the support ring. The support ring is fixedly connected with the split ring through bolts.

Furthermore, the side wall of the support ring is provided with a pin shaft fixing hole matched with the pin shaft, the end part of the swing rod is provided with a rotating hole, and the swing rod is sleeved on the pin shaft through the rotating hole and rotates along the pin shaft; a shaft sleeve is arranged in the rotating hole, and the rotating hole is sleeved on the pin shaft through the shaft sleeve; adjusting sleeves are arranged on two sides of the rotating hole on the pin shaft, and the relative position of the oscillating bar and the valve body is adjusted by adjusting the width of the adjusting sleeves.

Furthermore, a valve clack mounting hole is formed in the swing rod, the valve clack is provided with a connecting shaft matched with the valve clack mounting hole, the connecting shaft penetrates through the valve clack mounting hole and is locked through a nut, matched positioning holes are formed in the valve clack and the swing rod, and an anti-rotation pin is arranged in the positioning holes; the end part of the swing rod, which is close to the valve clack mounting hole, is provided with an anti-collision buffering bulge, and the height of the anti-collision buffering bulge is greater than that of the nut.

Compared with the prior art, the invention has the following beneficial effects: according to the swing check valve provided by the invention, the valve cover is matched and sealed with the wedge-shaped structure of the sealing ring, the higher the pressure is, the better the sealing performance is, and the swing check valve is suitable for high-pressure occasions; the upper part of the sealing ring is positioned in an embedded mode through the compression ring and the side face of the four-open ring, and the top of the four-open ring is locked to the valve cover through the cover plate and the stud, so that the structure is compact, the size is small, and the weight is light; the support ring is arranged in the valve body, so that the pin shaft is connected to the valve body through the support ring, and the fixing is firm and reliable; adjusting sleeves are arranged on two sides of the oscillating bar on the pin shaft, the relative position of the oscillating bar and the valve body is adjusted, and then the butt joint precision of the valve clack and the valve seat is adjusted, so that a better sealing effect is achieved; through the valve seat groove that the slope set up for the valve seat structure is regular, the assembly of being convenient for.

Drawings

FIG. 1 is a schematic view of a swing check valve according to an embodiment of the present invention;

FIG. 2 is an exploded view of a seal configuration in an embodiment of the present invention;

FIG. 3 is a top view of the valve flap mounting structure mounted in the valve body in an embodiment of the present invention;

FIG. 4 is a schematic view of the installation of the swing link and the valve flap in the embodiment of the invention.

In the figure:

1. a valve body; 2. a valve seat; 3. positioning pins; 4. a support ring; 5. a pin shaft; 6. a shaft sleeve; 7. a stud; 8. a cover plate; 9. a valve cover; 10. opening a ring; 11. a pressure ring 12 and a sealing ring; 13. a bolt; 14. opening the ring; 15. a nut; 16. a swing rod; 17. an anti-rotation pin; 18. a valve flap; 19. an adjusting sleeve; 20. the anti-collision buffer bulge; 21. an inlet flow channel; 22. an outlet flow passage; 101. and (6) disassembling the hole.

Detailed Description

The invention is further described below with reference to the figures and examples.

Fig. 1 is a schematic structural diagram of a swing check valve in an embodiment of the present invention.

Referring to fig. 1, the swing check valve of the embodiment of the present invention includes a valve body 1, an inlet flow passage 21 and an outlet flow passage 22 are disposed in the valve body 1, a valve seat 2 is disposed at an outlet end of the inlet flow passage 21 in the valve body 1, and a valve flap 18 matched with the valve seat 2 is disposed in the valve body 1, and is characterized in that a valve cover 9 is disposed at the top of the valve body 1, a wedge-shaped sealing groove is formed between an upper edge of the valve cover 9 and an inner wall of the valve body 1, a sealing ring 12 matched with the sealing groove is disposed in the wedge-shaped sealing groove, and the sealing ring 12 is locked to the valve cover 9; a support ring 4 is arranged below the valve cover 9, the support ring 4 is rotatably connected with the end part of a swing rod 16 through a pin 5, and the swing rod 16 is connected to a valve clack 18 and drives the valve clack 18 to rotate to open and close.

Specifically, the outlet end of the inlet flow passage in the valve body 1 is obliquely provided with a valve seat groove, and the valve seat 2 is arranged in the valve seat groove. Through set up the disk seat groove that has the inclination in valve body 1, disk seat 2 can be designed for the structure of no inclination, during the assembly directly to disk seat 2 weld valve body 1 on can, need not the adjustment, degree of difficulty during the assembly that can significantly reduce.

Specifically, locking structure includes clamping ring 11, ring opening four 10 and apron 8, clamping ring 11 sets up in sealing washer 12 top, 11 upper surfaces of clamping ring and valve gap 9 upper surface parallel and level, ring opening four 10 sets up in clamping ring 11 top, 1 inner wall of valve body is provided with the mounting groove that matches with ring opening four 10, ring opening four 10 is inlayed from the side and is established in the mounting groove, apron 8 sets up ring opening four 10 tops, be provided with double-screw bolt 7 in the apron 8, double-screw bolt 7 runs through apron 8 is connected to valve gap 9.

Referring to fig. 2, in the swing check valve according to the embodiment of the present invention, the valve cover 9 is a cylinder as a whole, the diameter of the bottom of the valve cover 9 is larger than that of the top of the valve cover, the middle portion of the valve cover 9 connecting the bottom and the top is a circular truncated cone, the diameter of the bottom of the valve cover 9 is matched with the inner diameter of the top of the valve body 1, and when the valve cover 9 is disposed in the valve body 1, a wedge-shaped sealing groove is formed between the upper portion of the valve cover 9 and the.

Specifically, the sealing ring 12 is annular, the outer diameter of the sealing ring 12 is matched with the diameter of the bottom of the valve cover 9, the inner diameter of the sealing ring 12 is matched with the diameter of the top of the valve cover 9, and the inner wall of the lower portion of the sealing ring 12 is in a circular truncated cone shape matched with the middle of the valve cover 9. The seal ring 12 is made of flexible graphite and stainless steel wire. The valve cover 9 is matched with the wedge-shaped sealing ring 12 in angle, when the pressure is increased, the valve cover 9 is pushed to move upwards, the valve cover 9 extrudes the sealing ring 12, and the valve cover 9 is in inclined surface contact with the sealing ring 12, so that the sealing ring 12 is in closer contact with the valve cover 9 and the valve body 1 under the pressure, and the sealing performance is better as the pressure is higher.

Specifically, the pressing ring 11 is annular, the outer diameter of the pressing ring 11 is matched with the outer diameter of the bottom of the valve cover 9, and the inner diameter of the pressing ring 11 is matched with the outer diameter of the top of the valve cover 9; the four-open ring 10 is an arc-shaped block which is formed by four parts of post processing through a whole ring, the outer diameter of the four-open ring 10 is larger than the outer diameter of the bottom of the valve cover 9, and the inner diameter of the four-open ring 10 is slightly larger than the outer diameter of the top of the valve cover 9 and smaller than the outer diameter of the bottom of the valve cover 9. The height of mounting groove and the high matching of ring 10 open, the internal diameter of mounting groove matches with ring 10 open's external diameter, ring 10 open is two and sets up in the mounting groove relatively, and will sealing washer 12 and clamping ring 11 location. The four-open ring 10 and the compression ring 11 can be locked by correspondingly arranged mounting hole screws. The bottom surface of the compression ring 11 is completely attached to the sealing ring 12, the side surfaces of the four-open ring 10 are embedded and positioned, the top of the four-open ring 10 is locked to the valve cover 9 through the cover plate 8 and the stud 7, the structure is compact, and locking is firm.

Preferably, the side wall of the valve body 1 is provided with a through-going dismounting hole 101 at a position corresponding to the mounting groove. When the valve needs to be disassembled for maintenance or the sealing ring 12 is replaced, the four-open ring 10 can be easily disassembled through the disassembling hole 101, and the problem that the four-open ring 10 is difficult to disassemble due to occlusion with the valve body 1 under the action of medium pressure is avoided.

Preferably, the bottom surface of the cover plate 8 is provided with a positioning groove matched with the four-open ring 10, so that the four-open ring 10 is positioned and the displacement of the four-open ring 10 is avoided.

Specifically, the top surface of the valve cover 9 is provided with an internal thread hole matched with the stud 7, a through stud hole is formed in the cover plate 8, the stud hole corresponds to the internal thread hole of the valve cover 9, and the stud 7 penetrates through the internal thread hole and the valve cover 9.

Referring to fig. 1, in the swing check valve according to the embodiment of the present invention, a split ring 14 is disposed above a support ring 4, a fixing groove matched with the split ring 14 is disposed on an inner wall of the valve body 1, the split ring 14 is embedded in the fixing groove from a side surface to fix the support ring 4, and a positioning pin 3 is disposed below the support ring 4, and the positioning pin 3 is connected to the valve body 1 for positioning. The top external diameter of support ring 4 is greater than the bottom external diameter and is formed with the installation step at support ring 4 outer wall, 1 inner wall of valve body is provided with the installation boss that matches with the installation step, support ring 4 sets up on the installation boss. The split ring 14 is an arc-shaped block which is formed by dividing a whole ring into two parts and then processing the two parts, the outer diameter of the split ring 14 is larger than the outer diameter of the top of the support ring 4, and the inner diameter of the split ring 14 is larger than the inner diameter of the support ring 4 and smaller than the outer diameter of the bottom of the support ring 4. The support ring 4 is fixedly connected with the split ring 14 by bolts 13. The split ring 14 fixes the support ring 4 to prevent the support ring 4 from moving up and down.

Specifically, the side wall of the support ring 4 is provided with a pin shaft fixing hole matched with the pin shaft 5, the end part of the swing rod 16 is provided with a rotating hole, and the swing rod 16 is sleeved on the pin shaft 5 through the rotating hole and rotates along the pin shaft 5.

Preferably, a shaft sleeve 6 is arranged in the rotating hole, and the rotating hole is sleeved on the pin shaft 5 through the shaft sleeve 6. The shaft sleeve 6 is made of aluminum bronze material, when the valve clack 18 is opened or closed, the shaft sleeve 6 reduces the friction force between the oscillating bar 16 and the oscillating bar 16 when the oscillating bar 16 rotates back and forth, and the service life is prolonged.

Referring to fig. 3, in the swing check valve of the embodiment of the present invention, the adjusting sleeves 19 are disposed on two sides of the rotating hole on the pin 5, and the width of the adjusting sleeve 19 is adjusted to adjust the relative position between the swing rod 16 and the valve body 1, so as to ensure that the valve flap 18 and the valve seat sealing surface of the valve body 1 are accurately butted and matched, thereby achieving a better sealing effect.

Referring to fig. 4, in the swing check valve of the embodiment of the present invention, a valve flap mounting hole is formed in a swing rod 16, the valve flap 18 is provided with a connecting shaft matched with the valve flap mounting hole, and the connecting shaft passes through the valve flap mounting hole and is locked by a nut 15, so that the valve flap 18, an anti-rotation pin 17 and the swing rod 16 are prevented from being separated; the valve clack 18 and the swing rod 16 are provided with matched positioning holes, and an anti-rotation pin 17 is arranged in the positioning holes to prevent the valve clack 18 from freely rotating relative to the swing rod 16. The end part of the swing rod 16 close to the valve clack mounting hole is provided with an anti-collision buffer bulge 20, the height of the anti-collision buffer bulge 20 is larger than that of the nut 15, and when the valve clack 18 is in an open state, the anti-collision buffer bulge 20 firstly contacts with the valve body 1 for buffering.

In summary, in the swing check valve of the embodiment of the invention, the valve cover 9 is matched and sealed with the wedge-shaped structure of the sealing ring 12, and the higher the pressure is, the better the sealing performance is, so that the swing check valve is suitable for high-pressure occasions; the upper part of the sealing ring 12 is positioned in an embedded mode through the side face of the pressing ring 11 and the four-open ring 10, the top of the four-open ring 10 is locked to the valve cover 9 through the cover plate 8 and the stud 7, and the four-open ring is compact in structure, small in size and light in weight; a support ring 4 is arranged in the valve body 1, so that the pin shaft 5 is connected to the valve body 1 through the support ring 4, and the fixation is firm and reliable; adjusting sleeves 19 are arranged on two sides of a swing rod 16 on the pin shaft 5, the relative position of the swing rod 16 and the valve body 1 is adjusted, and then the butt joint precision of the valve clack 18 and the valve seat 2 is adjusted, so that a better sealing effect is achieved; through the valve seat groove that the slope set up for valve seat 2 structure is regular, the assembly of being convenient for.

Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A swing check valve comprises a valve body, wherein an inlet runner and an outlet runner are arranged in the valve body, a valve seat is arranged at the outlet end of the inlet runner in the valve body, and a valve clack matched with the valve seat is arranged in the valve body; a support ring is arranged below the valve cover, the support ring is rotatably connected with the end part of a swing rod through a pin shaft, and the swing rod is connected to the valve clack and drives the valve clack to rotate to open and close; and the outlet end of the inlet flow passage in the valve body is obliquely provided with a valve seat groove, and the valve seat is arranged in the valve seat groove.

2. The swing check valve according to claim 1, wherein the locking structure comprises a compression ring, four open rings and a cover plate, the compression ring is arranged above the sealing ring, the upper surface of the compression ring is flush with the upper surface of the valve cover, the four open rings are arranged above the compression ring, the inner wall of the valve body is provided with a mounting groove matched with the four open rings, the four open rings are embedded in the mounting groove from the side surface, the cover plate is arranged above the four open rings, the cover plate is provided with a stud, and the stud penetrates through the cover plate and is connected to the valve cover.

3. The swing check valve as claimed in claim 2, wherein the valve cover is a cylinder as a whole, the diameter of the bottom of the valve cover is larger than that of the top of the valve cover, the middle part of the valve cover connecting the bottom and the top is a circular truncated cone, the diameter of the bottom of the valve cover is matched with the inner diameter of the top of the valve body, and when the valve cover is arranged in the valve body, a wedge-shaped sealing groove is formed between the upper part of the valve cover and the inner wall of the valve body; the sealing ring is annular, the outer diameter of the sealing ring is matched with the diameter of the bottom of the valve cover, the inner diameter of the sealing ring is matched with the diameter of the top of the valve cover, and the inner wall of the lower part of the sealing ring is in a circular truncated cone shape matched with the middle of the valve cover; the sealing ring is made of flexible graphite and stainless steel wires.

4. The swing check valve according to claim 3, wherein the compression ring is annular, the compression ring having an outer diameter matching the bottom outer diameter of the valve cap, and an inner diameter matching the top outer diameter of the valve cap; the arc piece that four ring-opening are formed for being divided into four postprocessing by a integer, the external diameter of four ring-opening is greater than valve gap bottom external diameter, the internal diameter of four ring-opening slightly is greater than the top external diameter of valve gap and is less than the bottom external diameter of valve gap, the high and four ring-opening's of mounting groove highly match, the internal diameter of mounting groove matches with four ring-opening's external diameter, four ring-opening are two and relative setting in the mounting groove, and will sealing washer and clamping ring location.

5. The swing check valve as claimed in claim 2, wherein the cover plate is provided at a bottom surface thereof with a positioning groove matching the four open rings; the valve gap top surface is provided with the internal thread hole that matches with the double-screw bolt, be provided with the stud hole that link up on the apron, the stud hole corresponds the setting with the internal thread hole of valve gap, the double-screw bolt passes the stud hole passes through internal thread jogged joint with the valve gap.

6. The swing check valve as claimed in claim 2, wherein the side wall of the valve body is provided with a through-hole for removal at a position corresponding to the mounting groove.

7. The swing check valve as claimed in claim 1, wherein a split ring is provided above the support ring, the inner wall of the valve body is provided with fixing grooves matched with the split ring, the split ring is embedded in the fixing grooves from the side to fix the support ring, and a positioning pin is provided below the support ring, the positioning pin being connected to the valve body for positioning.

8. The swing check valve according to claim 7, wherein the support ring has a top outer diameter greater than a bottom outer diameter and a mounting step formed on an outer wall thereof, the valve body inner wall is provided with a mounting boss matching the mounting step, and the support ring is disposed on the mounting boss; the split ring is an arc-shaped block which is formed by dividing a whole ring into two parts and then processing, the outer diameter of the split ring is larger than the outer diameter of the top of the support ring, the inner diameter of the split ring is larger than the inner diameter of the support ring and smaller than the outer diameter of the bottom of the support ring, and the support ring and the split ring are fixedly connected through a bolt.

9. The swing check valve according to claim 7, wherein the side wall of the support ring is provided with a pin fixing hole matched with the pin, the end of the swing rod is provided with a rotating hole, and the swing rod is sleeved on the pin through the rotating hole and rotates along the pin; a shaft sleeve is arranged in the rotating hole, and the rotating hole is sleeved on the pin shaft through the shaft sleeve; adjusting sleeves are arranged on two sides of the rotating hole on the pin shaft, and the relative position of the oscillating bar and the valve body is adjusted by adjusting the width of the adjusting sleeves.

10. The swing check valve as claimed in claim 7, wherein the swing link is provided with a valve flap mounting hole, the valve flap is provided with a connecting shaft matched with the valve flap mounting hole, the connecting shaft passes through the valve flap mounting hole and is locked by a nut, the valve flap and the swing link are provided with matching positioning holes, and an anti-rotation pin is arranged in the positioning hole; the end part of the swing rod, which is close to the valve clack mounting hole, is provided with an anti-collision buffering bulge, and the height of the anti-collision buffering bulge is greater than that of the nut.