CN219221367U

CN219221367U - Stop check valve

Info

Publication number: CN219221367U
Application number: CN202223228727.4U
Authority: CN
Inventors: 王晖
Original assignee: Shanghai Afs Valve Co ltd
Current assignee: Shanghai Afs Valve Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-06-20
Anticipated expiration: 2032-12-02

Abstract

The present utility model provides a stop check valve, comprising: the valve body and the valve clack assembly are arranged in the valve body and comprise valve clacks; the sealing surface of the valve clack is matched with the sealing surface of the valve body to realize a stop effect; the sealing surface of the valve clack and the sealing surface of the valve body are sealed in a soft sealing mode; the valve rod is arranged above the valve clack assembly and drives the valve clack assembly to move up and down, and the valve rod is provided with an internal cavity; the inner diameter of the valve clack is in clearance fit with the outer diameter of the valve rod so as to realize up-down centering movement; the spring is arranged between the valve clack assembly and the valve rod, one end of the spring is fixed on the valve clack assembly, and the other end of the spring is fixed in the valve rod; the valve clack is closed rapidly by the restoring force of the spring to realize the non-return function. The utility model has the functions of cutting off, adjusting and throttling of the traditional stop valve, and simultaneously realizes the non-return function, the valve clack is closed rapidly, and the stable action of the opening and closing process can be ensured.

Description

Stop check valve

Technical Field

The utility model relates to the technical field of valves, in particular to a stop check valve.

Background

The stop valve and the check valve are widely applied in the technical field of modern manufacturing engineering, and the stop valve is a very important cut-off valve which plays important roles in cutting off, adjusting and throttling media in a pipeline where the stop valve is positioned.

As the stop valve and the check valve are increasingly applied to various industries, the performance of the original traditional stop valve is continuously improved, and the development of new products of the stop valve which are suitable for market requirements is unprecedented. The conventional low-temperature stop valve usually encounters a problem, and due to the limitation of the structure of the conventional low-temperature stop valve, the medium has a certain backflow risk, so that the requirement of market diversification is far satisfied.

The search finds that:

the Chinese patent with publication number CN201992147U discloses a novel stop check valve structure, which comprises a valve body, a valve cover, a valve clack, a valve rod and a hand wheel, wherein the valve body is provided with a sealing surface, the valve clack is arranged in the valve body, the upper end of the valve rod is connected with the hand wheel, and the lower end of the valve rod is movably connected with the valve clack, so that the valve clack can move up and down at the axial position of the valve rod. This patent achieves dual functions of both a shut-off valve and a check valve, but still suffers from the following problems: the noise is great in the opening and closing process, and it is steady inadequately to open and close, and this stop check valve is after using a period in addition, if the spring takes place to damage or fracture, and the spring of damage easily enters into the pipeline, and then leads to the host computer to damage.

Disclosure of Invention

In view of the drawbacks of the prior art, an object of the present utility model is to provide a shut-off check valve.

The utility model is realized by the following technical scheme:

according to an aspect of the present utility model, there is provided a stop check valve including:

the valve body is provided with a valve body,

the valve clack assembly is arranged in the valve body and comprises a valve clack; the sealing surface of the valve clack is matched with the sealing surface of the valve body to realize a stop effect; the sealing surface of the valve clack and the sealing surface of the valve body are sealed in a soft sealing mode;

the valve rod is arranged above the valve clack assembly and drives the valve clack assembly to move up and down, and the valve rod is provided with an internal cavity; the inner diameter of the valve clack is in clearance fit with the outer diameter of the valve rod so as to realize up-down centering movement;

the spring is arranged between the valve clack assembly and the valve rod, one end of the spring is fixed on the valve clack assembly, and the other end of the spring is fixed in the valve rod; and the valve clack is quickly closed by the restoring force of the spring to realize the non-return function.

Further, the valve cover assembly covers the upper end of the valve body, and the pressing sleeve is positioned above the valve cover assembly and sleeved at the upper end of the valve rod; the pressing sleeve is fixedly connected with the valve cover assembly.

Further, characterized in that, the pressure sleeve is through gland nut with valve gap subassembly fixed connection.

Further, the sealing assembly is arranged between the pressing sleeve and the valve rod, and the resistance and the tightness between the valve rod and the pressing sleeve are increased by pressing the sealing assembly through the pressing sleeve.

Further, the sealing assembly comprises an O-shaped ring, a V-shaped sealing ring and an upper sealing gasket from top to bottom in sequence, wherein the upper sealing gasket is simultaneously used as a base, the O-shaped ring is simultaneously used as a buffer piece, and the V-shaped opening of the V-shaped sealing ring is enlarged under the action of the pressing sleeve.

Further, a gasket is arranged below the sealing assembly, and the gasket plays a limiting role on the pressing sleeve.

Further, the V-shaped sealing ring and the upper sealing gasket are formed by polytetrafluoroethylene.

Further, a valve cover sealing gasket is arranged between the valve cover assembly and the valve body.

Further, the sealing surface of the valve clack is formed by using poly (chlorotrifluoroethylene).

Further, a hand wheel is arranged at the upper end of the valve rod, and the hand wheel is fixedly connected with the valve rod through a hexagonal nut.

Compared with the prior art, the utility model has at least one of the following beneficial effects:

1. the stop check valve adopts the sleeve guide type structure that the inner hole of the valve clack and the outer diameter of the valve rod move up and down in a guide type manner, is beneficial to centering, reducing friction and noise, is beneficial to interchange of flow characteristics, and can ensure stable action in the opening and closing process.

2. According to the stop check valve, the spring is arranged between the cavity of the valve rod and the valve clack assembly, so that the valve clack can be quickly closed to play a role of stopping, meanwhile, when the spring is twisted or broken after reaching the service life, spring fragments cannot enter a pipeline, and therefore the pipeline and equipment can be still protected under the condition that the spring is broken and damaged, and the production safety is greatly improved.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

fig. 1 is a schematic structural view of a stop check valve according to an embodiment of the present utility model.

In the figure: 1 is a valve body, 2 is a valve clack assembly, 3 is a valve rod, 4 is a spring, 5 is a valve cover sealing gasket, 6 is a valve cover assembly, 7 is an inner hexagonal screw, 8 is a gasket, 9 is an upper sealing gasket, 10 is a V-shaped sealing ring, 11 is an O-shaped ring, 12 is a pressing sleeve, 13 is a compression nut, 14 is a hand wheel, 15 is a hand wheel nameplate, and 16 is a hexagonal nut.

Detailed Description

The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.

The embodiment of the utility model provides a stop check valve, in particular to a multifunctional stop check valve, which can realize cutting or adjusting of a medium and prevent the medium from flowing backwards in a low-temperature state, and referring to fig. 1, the stop check valve comprises a valve body 1, a valve rod 3, a valve clack assembly 2 and a spring 4, wherein: the valve clack assembly 2 is arranged in the valve body 1, and the valve clack assembly 2 comprises a valve clack; the sealing surface of the valve clack is matched with the sealing surface of the valve body 1 to realize a stop effect; the sealing surface of the valve clack and the sealing surface of the valve body 1 are sealed in a soft sealing mode; the valve rod 3 is arranged above the valve clack assembly 2, and the valve rod 3 drives the valve clack assembly 2 to move up and down so as to open/close the valve; the valve rod 3 is provided with an internal cavity, the outer diameter of the valve rod 3 is in clearance fit with the inner diameter of the valve clack, the valve clack inner hole and the outer diameter of the valve rod 3 are used for guiding up-and-down guiding centering movement, specifically, the valve clack inner hole is an inner diameter hole and is used for guiding the valve rod 3 and the mounting spring 4, the tolerance zone of the valve clack inner diameter hole is above the tolerance zone of the valve rod outer diameter, namely, the actual size of the valve clack inner diameter hole is larger than or equal to the actual size of the valve rod outer diameter, and only up-and-down linear movement and no left-right movement can be realized through the clearance fit of the valve clack and the valve rod 3; the valve rod 3 is provided with a small hole on the outer wall, the small hole is close to the upper end of the spring 4, the spring 4 is arranged between the valve clack assembly 2 and the valve rod 3, one end of the spring 4 is fixed on the valve clack assembly 2, and the other end of the spring 4 is fixed in the valve rod 3; the valve clack is quickly closed by the restoring force of the spring 4 to realize the non-return function.

In the prior art, a hard seal is adopted between the sealing surface of the valve clack and the sealing surface of the valve body, the fitting degree of the sealing part is poor, a gap exists, and leakage is caused. In the above embodiment, the sealing surface of the valve clack is a lower sealing gasket arranged below the valve clack, preferably, the lower sealing gasket adopts a PCTFE gasket, and because the PCTFE gasket is softer, the bonding degree between the metal hard surface and the plastic soft surface is better, and zero leakage without gaps is basically realized, therefore, the whole sealing effect is better by the contact of the lower sealing gasket with the sealing surface of the valve body 1.

When the inlet end passes through the medium, the stop check valve can generate certain pressure, acts on the valve clack to overcome the resistance of the spring 4, so that the spring 4 is compressed, the valve clack is pushed away, the valve clack moves upwards to flow the medium, when the inlet end has no medium or pressure, the force acting on the spring 4 disappears, and the spring 4 is quickly reset, so that the valve clack is driven to be quickly closed. The embodiment of the utility model improves and optimizes the structure of the common low-temperature stop valve, so that the stop check valve has the traditional functions of cutting off, adjusting and throttling, and simultaneously realizes the check function. The stop check valve in the embodiment of the utility model has better sealing performance because the sealing surface of the valve clack and the sealing surface of the valve body 1 are sealed in a soft sealing mode; adopt valve clack hole and valve rod 3 external diameter to carry out this kind of sleeve direction type structure of activity about guided type, be favorable to centering, set up spring 4 between valve rod 3 and valve clack subassembly 2 for the valve clack can be quick close, play the effect of non return, when spring 4 reaches life and takes place distortion or fracture simultaneously, the pressure valve clack through medium itself can be closed rapidly, consequently the spring piece can not enter into in the pipeline, thereby still can protect pipeline and equipment under the circumstances that spring 4 fracture damaged, the security of production has been improved greatly. The stop check valve in the embodiment is beneficial to reducing friction, noise and flow characteristic interchange, and can ensure the excellent characteristics of stable action in the opening and closing process.

In some embodiments, the valve further comprises a valve cover assembly 6 and a pressing sleeve 12, wherein the valve cover assembly 6 covers the upper end of the valve body 1, the valve rod 3 passes through the valve cover assembly 6, and the pressing sleeve 12 is positioned above the valve cover assembly 6 and sleeved on the upper end of the valve rod 3; the pressing sleeve 12 is fixedly connected with the valve cover assembly 6.

In some embodiments, the pressure jacket 12 is fixedly connected to the valve cover assembly 6 by a compression nut 13. Specifically, the compression nut 13 passes through the compression sleeve 12 from the upper end of the compression sleeve 12, and is fixedly connected with the valve cover assembly 6 at the lower end of the compression nut 13 in a threaded connection manner. The compression nut 13 serves to fix the press sleeve 12 and prevent the press sleeve 12 from moving upward.

In some embodiments, a sealing assembly is arranged between the pressing sleeve 12 and the valve rod 3, and the resistance and the tightness between the valve rod 3 and the pressing sleeve 12 are increased by pressing the sealing assembly through the pressing sleeve 12.

In some embodiments, the sealing assembly sequentially comprises an O-shaped ring 11, a V-shaped sealing ring 10 and an upper sealing gasket 9 from top to bottom, the upper sealing gasket 9 is simultaneously used as a base, the O-shaped ring 11 is simultaneously used as a buffer piece, and the V-shaped opening of the V-shaped sealing ring 10 is increased under the action of the pressing sleeve 12, so that the resistance and the tightness between the valve rod 3 and the pressing sleeve 12 are increased.

In some embodiments, a gasket 8 is arranged below the sealing assembly, and the gasket 8 plays a limiting role on the pressing sleeve 12; preferably, the gasket 8 is formed of a steel material that compresses the press sleeve 12 as the press sleeve 12 moves downward to compress the seal assembly.

In some embodiments, the sealing surface of the valve flap is formed from poly (chlorotrifluoroethylene) which has excellent chemical stability, insulation and weatherability, can be used for a long period of time between-196 degrees and 125 degrees, and has good mechanical strength and hardness.

In some embodiments, the V-shaped sealing ring 10 and the upper sealing gasket 9 used as the packing seal are formed by polytetrafluoroethylene, and the polytetrafluoroethylene can be applied to various working conditions requiring acid resistance, alkali resistance and organic solvent, and has the advantages of good sealing performance, high lubrication, non-viscosity, electrical insulation, good ageing resistance, large temperature-resistant span and long-term working between-180 degrees and 250 degrees.

In some embodiments, the valve cover assembly 6 is fixedly connected with the valve body 1 through the socket head cap screw 7, and a valve cover sealing gasket 5 is arranged between the valve cover and the valve body 1 so as to ensure the tightness of the valve.

In some embodiments, the upper end of the valve rod 3 is provided with a hand wheel 14, the hand wheel 14 is provided with a hand wheel nameplate 15, the hand wheel 14 is fixedly connected with the valve rod 3 through a hexagonal nut 16, and the valve rod 3 can drive the valve clack to move through rotating the hand wheel 14, so that the opening and closing of the valve and the flow are realized.

The working process of the stop check valve in the embodiment is as follows:

with continued reference to fig. 1, the direction of the arrows IN fig. 1 indicates the flow of the medium, and when the medium flows IN from the inlet end (IN fig. 1), the pressure generated by the flow of the medium acts on the valve flap, which IN turn acts on the spring 4, so that the spring 4 compresses, the valve flap opens, and the medium can control the flow of the outlet end (OUT IN fig. 1) by means of the regulating handwheel 14.

When the valve needs to be closed, no medium enters at the inlet end, the force acting on the spring 4 disappears, the spring 4 resets, and the valve clack is quickly closed, so that the function of quickly closing the valve is realized.

The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the utility model.

Claims

1. A stop check valve, comprising:

the valve body is provided with a valve body,

the spring is arranged between the valve clack assembly and the valve rod, one end of the spring is fixed on the valve clack assembly, and the other end of the spring is fixed in the valve rod; the valve clack is quickly closed by the restoring force of the spring to realize the non-return function;

the sealing surface of the valve clack is formed by polytrifluoroethylene, the outer wall of the valve rod is provided with a small hole, and the small hole is close to the upper end of the spring.

2. The stop check valve of claim 1, further comprising a cap assembly covering the upper end of the valve body and a press sleeve over the cap assembly and surrounding the upper end of the valve stem; the pressing sleeve is fixedly connected with the valve cover assembly.

3. The stop check valve of claim 2, wherein the pressure jacket is fixedly connected to the valve cover assembly by a compression nut.

4. The stop check valve of claim 2, wherein a sealing assembly is provided between the pressure sleeve and the valve stem, and the sealing assembly is compressed by the pressure sleeve to increase the resistance and tightness between the valve stem and the pressure sleeve.

5. The stop and check valve of claim 4, wherein the sealing assembly comprises an O-ring, a V-ring and an upper gasket in sequence from top to bottom, the upper gasket simultaneously acting as a seat, the O-ring simultaneously acting as a buffer, the V-shaped opening of the V-ring increasing under the action of the jacket.

6. The stop and check valve of claim 4, wherein a gasket is disposed below the seal assembly, the gasket limiting the pressure jacket.

7. The stop and check valve of claim 5, wherein said V-ring seal and said upper gasket are formed of polytetrafluoroethylene.

8. The shut-off check valve of claim 2, wherein a bonnet sealing gasket is disposed between the bonnet assembly and the valve body.

9. The stop check valve of claim 1, wherein a hand wheel is provided at an upper end of the valve stem, the hand wheel being fixedly connected to the valve stem by a hex nut.