CN211649255U

CN211649255U - Multi-directional low-load stop valve

Info

Publication number: CN211649255U
Application number: CN201922200751.9U
Authority: CN
Inventors: 黑松灿; 王宝瑞; 于世杰; 梁素芳; 董瑞鹏
Original assignee: Yuanda Vavle Group Co ltd
Current assignee: Yuanda Vavle Group Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-10-09
Anticipated expiration: 2029-12-10

Abstract

The utility model discloses a multidirectional low load stop valve, including valve body, valve gap, valve rod, hand wheel and valve clack subassembly. When the valve rod of the valve is opened and lifted, the secondary seal formed by the matching of the shoulder and the valve clack is firstly opened. The small area of the shoulder and the correspondingly small moment of pressure action, so that the moment required for opening the secondary seal is not very large. After the auxiliary seal is opened, the front and back differential pressures are balanced, and then the main seal is opened easily. One sealing surface of the auxiliary seal is an arc-shaped surface at the lower end of the convex shoulder, the other sealing surface is welded on the valve clack in a surfacing mode and is a conical surface, the double-sealing effect can be realized without adding parts, the operating torque of the valve is reduced, and the good effect of the auxiliary seal can be ensured even if the valve rod is inclined.

Description

Multi-directional low-load stop valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a multidirectional low load stop valve.

Background

The problem that traditional stop valve exists on the existing market does: 1) the valve closing torque of the large-diameter stop valve is too large, and manual operation cannot be realized; 2) the valve is installed on a pipeline with certain directional requirements, the installation position is limited, and the valve cannot be installed on a vertical pipeline generally.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multidirectional low load stop valve to the not enough of above-mentioned prior art.

In order to solve the above problems, the utility model adopts the following technical proposal:

a multi-directional low-load stop valve comprises a valve body, a valve cover, a valve rod, a hand wheel and a valve clack assembly, wherein the valve body is fixedly connected with the valve cover, a medium inlet and a medium outlet are formed in the valve body, the valve rod penetrates through the valve cover and extends into the valve body, the upper portion of the valve rod is in threaded connection with a valve rod nut arranged on the valve cover, the hand wheel is fixed to the top of the valve rod, the valve clack assembly is arranged at the bottom of the valve rod, a convex shoulder is arranged at the bottom end of the valve rod, the lower end of the convex shoulder is an arc-shaped surface, the valve clack assembly comprises a valve clack and a valve clack cover, a cavity is arranged at the upper end of the valve clack, the convex shoulder extends into the cavity, the valve clack cover is arranged on the valve rod and is fixedly connected with the valve clack, a retaining shoulder matched with the, the valve clack sealing surface of the valve clack is matched with the valve seat sealing surface in the valve body to form a main seal, and the convex shoulder is matched with the valve clack to form an auxiliary seal.

According to a further technical scheme, the gravity center of the valve clack assembly is located on a central axis of the valve clack cover.

According to a further technical scheme, one sealing surface of the auxiliary seal is an arc-shaped surface at the lower end of the convex shoulder, and the other sealing surface is arranged on the valve clack and an opening at the upper end of the first flow channel and is a conical surface.

According to a further technical scheme, the valve rod is made of 2Cr13 steel.

The technical scheme is that the valve rod is made of austenitic stainless steel, and STL hard alloy is welded on the arc-shaped surface at the lower end of the convex shoulder in a surfacing mode.

According to a further technical scheme, the sealing surface of the auxiliary seal, which is positioned on the valve clack, is welded on the valve clack in a mode of overlaying STL hard alloy.

A sealing gasket is arranged between the valve body and the valve cover contact surface.

According to a further technical scheme, the valve comprises a packing gland and a packing pressing plate, sealing packing is arranged between the middle of the valve rod and the valve cover, the packing gland is pressed on the upper portion of the sealing packing, the packing pressing plate is pressed on the packing pressing cover, the packing pressing plate is connected with the valve cover through an eyelet bolt, the lower end of the eyelet bolt is hinged with an ear hole in the valve cover through a pin shaft, two ends of the pin shaft penetrate out of the ear hole and then are provided with a cotter pin, and the upper end of the eyelet bolt penetrates through a pressing hole in the packing pressing plate and then is provided with a locking nut.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: when the valve rod of the valve is opened and lifted, the secondary seal formed by the matching of the shoulder and the valve clack is firstly opened. The small area of the shoulder and the correspondingly small moment of pressure action, so that the moment required for opening the secondary seal is not very large. After the auxiliary seal is opened, the front and back differential pressures are balanced, and then the main seal is opened easily.

One sealing surface of the auxiliary seal is an arc-shaped surface at the lower end of the convex shoulder, the other sealing surface is welded on the valve clack in a surfacing mode and is a conical surface, the double-sealing effect can be realized without adding parts, the valve operating torque is reduced, the auxiliary seal effect can be ensured to be good even if the valve rod is inclined, the two sealing surfaces of the auxiliary seal have the hardness difference of more than HRC 5, and the auxiliary seal can not be occluded and has long service life.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

fig. 3 is a partially enlarged schematic view of fig. 2.

In the figure: 1. a valve body; 2. a valve flap; 2-1, a cavity; 2-2, a first flow channel; 2-3, a second flow channel; 3. a valve flap cover; 3-1, blocking shoulders; 4. a valve stem; 4-1, shoulder; 5. a gasket; 6. a media inlet; 7. a media outlet; 8. a valve cover; 9. sealing and filling; 10. a packing gland; 11. a packing press plate; 12. a pin shaft; 13. an eye bolt; 14. a hand wheel; 15. locking the nut; 16. a valve stem nut; 17. and a cotter pin.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example 1: as shown in fig. 1-3, the multi-directional low-load stop valve of the present invention comprises a valve body 1, a valve cover 8, a valve rod 4, a hand wheel 14 and a valve flap assembly, wherein the valve body 1 is fixedly connected with the valve cover 8, the valve body 1 is provided with a medium inlet 6 and a medium outlet 7, the valve rod 4 passes through the valve cover 8 and extends into the valve body 1, the upper portion of the valve rod 4 is in threaded connection with a valve rod nut 16 arranged on the valve cover 8, the hand wheel 14 is fixed on the top of the valve rod 4, the valve flap assembly is arranged at the bottom of the valve rod 4, the bottom end of the valve rod 4 is provided with a shoulder 4-1, the lower end of the shoulder 4-1 is an arc-shaped surface, even if the valve rod 4 is inclined, the secondary sealing effect can be ensured to be good, the valve flap assembly comprises a valve flap 2 and a valve flap cover 3, the upper end of the valve, the valve clack cover 3 is sleeved on the valve rod 4 and fixedly connected with the valve clack 2, one end of the valve clack cover 3 is provided with a blocking shoulder 3-1 matched with the convex shoulder 4-1, the blocking shoulder 3-1 extends into the cavity 2-1, the bottom of the valve clack 2 is provided with a first flow passage 2-2 communicated with the cavity 2-1, the side part of the valve clack 2 is provided with a second flow passage 2-3 communicated with the cavity 2-1, the valve clack sealing surface of the valve clack 2 is matched with the valve seat sealing surface in the valve body 1 to form a main seal, and the convex shoulder 4-1 is matched with the valve clack 2 to form an auxiliary seal. One sealing surface of the auxiliary seal is an arc-shaped surface at the lower end of the convex shoulder 4-1, and the other sealing surface is arranged on the valve clack 2 and an opening at the upper end of the first flow channel 2-2 and is a conical surface. And the sealing surface of the auxiliary seal positioned on the valve clack 2 is welded on the valve clack 2 in a surfacing mode. In the present embodiment, the valve rod 4 is made of 2Cr13 steel, and the sealing surface of the secondary seal on the valve flap 2 is welded to the valve flap 2 in the form of overlay welding hard alloy. The two sealing surfaces have hardness difference of more than HRC 5, cannot be occluded and have long service life. The double-sealing valve has the advantages that the double-sealing effect can be realized without adding parts, and the operating torque of the valve is reduced.

In this embodiment, one end of the valve flap cover 3 is provided with a stop shoulder 3-1, and the other end extends to increase the guiding length of the valve flap cover 3, so that the center of gravity of the valve flap assembly is located on the central axis of the valve flap cover 3. The guide length of the valve clack cover 3 is increased to enable the valve clack cover 3 to be combined with the valve rod 4 more tightly, so that the valve clack assembly and the mounting structure of the valve rod 4 have a better guide effect, the gravity center of the valve clack assembly is located on the central axis of the valve clack cover 3, the influence of the gravity of the valve clack on sealing is reduced, and the valve clack cover is suitable for mounting at any position of a horizontal pipeline, a vertical pipeline and an inclined pipeline.

And a sealing gasket 5 is arranged between the contact surfaces of the valve body 1 and the valve cover 8. The novel valve rod sealing structure is characterized by further comprising a packing gland 10 and a packing pressing plate 11, a sealing packing 9 is arranged between the middle of the valve rod 4 and the valve cover 8, the packing gland 10 is pressed on the upper portion of the sealing packing 9, the packing pressing plate 11 is pressed on the packing gland 10, the packing pressing plate 11 is connected with the valve cover 8 through an eyelet bolt 13, the lower end of the eyelet bolt 13 is hinged with an ear hole in the valve cover 8 through a pin shaft 12, two ends of the pin shaft 12 penetrate out of the ear hole and then are provided with a split pin 17, and the upper end of the eyelet bolt 13 penetrates through a pressing hole in the packing pressing plate 11 and then is provided with a locking nut 15.

The working process is as follows: when the valve is opened, the hand wheel 14 is rotated anticlockwise to drive the valve rod 4 and the convex shoulder 4-1 to ascend, in the ascending process, the convex shoulder 4-1 and the valve clack 2 are firstly opened to form an auxiliary seal, the medium inlet 6 and the medium outlet 7 of the valve body 1 have the condition that the medium starts to flow to relieve the one-way pressure of the valve clack 2, the convex shoulder 4-1 is pulled by the valve rod 4 to continue to move upwards, and after the convex shoulder 4-1 is contacted with the retaining shoulder 3-1, the valve clack 2 is driven to move upwards until the valve is completely opened. When the valve is closed, the hand wheel 14 is rotated clockwise to drive the valve rod 4 and the convex shoulder 4-1 to descend, in the descending process, the valve clack sealing surface of the valve clack 2 is firstly closed to form a main seal in cooperation with the valve seat sealing surface in the valve body 1, the convex shoulder 4-1 is pulled by the valve rod 4 to continue to move downwards, and the auxiliary seal is closed.

The working principle is as follows: when the valve rod 4 of the valve is opened and lifted, the secondary seal formed by the matching of the shoulder 4-1 and the valve clack 2 is firstly opened. The small area of the shoulder 4-1 and the correspondingly small moment of pressure, the moment required to open the secondary seal is not very large. After the auxiliary seal is opened, the front and back differential pressures are balanced, and then the main seal is opened easily.

Example 2: the difference from example 1 is that the valve stem is made of austenitic stainless steel, and STL cemented carbide is deposited on the arc-shaped surface of the lower end of the shoulder.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. The utility model provides a multidirectional low load stop valve, includes valve body (1), valve gap (8), valve rod (4), hand wheel (14) and valve clack subassembly, valve body (1) and valve gap (8) fixed connection, be provided with medium import (6) and medium export (7) on valve body (1), valve rod (4) pass valve gap (8) and stretch into in valve body (1), valve rod (4) upper portion and valve rod nut (16) threaded connection who sets up on valve gap (8), hand wheel (14) are fixed valve rod (4) top, the valve clack subassembly sets up in valve rod (4) bottom, its characterized in that: the bottom end of the valve rod (4) is provided with a convex shoulder (4-1), the lower end of the convex shoulder (4-1) is an arc-shaped surface, the valve clack component comprises a valve clack (2) and a valve clack cover (3), the upper end of the valve clack (2) is provided with a cavity (2-1), the convex shoulder (4-1) extends into the cavity (2-1), the valve clack cover (3) is sleeved on the valve rod (4) and is fixedly connected with the valve clack (2), one end of the valve clack cover (3) is provided with a retaining shoulder (3-1) matched with the convex shoulder (4-1), the retaining shoulder (3-1) extends into the cavity (2-1), the bottom of the valve clack (2) is provided with a first flow passage (2-2) communicated with the cavity (2-1), the side part of the valve clack (2) is provided with a second flow passage (2-3) communicated with, the sealing surface of the valve clack (2) is matched with the sealing surface of a valve seat in the valve body (1) to form a main seal, and the convex shoulder (4-1) is matched with the valve clack (2) to form an auxiliary seal.

2. A multi-directional low load stop valve as defined in claim 1, wherein: the gravity center of the valve clack component is positioned on the central axis of the valve clack cover (3).

3. A multi-directional low load stop valve as defined in claim 1, wherein: one sealing surface of the auxiliary seal is an arc-shaped surface at the lower end of the convex shoulder (4-1), and the other sealing surface is arranged on the valve clack (2) and an opening at the upper end of the first flow channel (2-2) and is a conical surface.

4. A multi-directional low load stop valve as defined in claim 3, wherein: the valve rod (4) is made of 2Cr13 steel.

5. A multi-directional low load stop valve as defined in claim 3, wherein: the valve rod (4) is made of austenitic stainless steel, and STL hard alloy is welded on the arc-shaped surface at the lower end of the convex shoulder (4-1).

6. A multi-directional low load stop valve as defined in claim 3, wherein: and the sealing surface of the auxiliary seal positioned on the valve clack (2) is welded on the valve clack (2) in a way of overlaying STL hard alloy.

7. A multi-directional low load stop valve according to claim 1, characterized in that a sealing gasket (5) is arranged between the contact surfaces of the valve body (1) and the valve cover (8).

8. The multi-directional low-load stop valve according to claim 1, further comprising a packing gland (10) and a packing pressure plate (11), wherein a sealing packing (9) is arranged between the middle of the valve rod (4) and the valve cover (8), the packing gland (10) is pressed on the upper portion of the sealing packing (9), the packing pressure plate (11) is pressed on the packing gland (10), the packing pressure plate (11) is connected with the valve cover (8) through an eyelet bolt (13), the lower end of the eyelet bolt (13) is hinged to an ear hole on the valve cover (8) through a pin shaft (12), two ends of the pin shaft (12) penetrate through the ear hole and then are provided with an open pin (17), and the upper end of the eyelet bolt (13) penetrates through the pressing hole on the packing pressure plate (11) and then is provided with a locking nut (15).