CN214534670U

CN214534670U - Check valve and valve block using same

Info

Publication number: CN214534670U
Application number: CN202120779238.4U
Authority: CN
Inventors: 邓玉林; 李余
Original assignee: Mercer Intelligent Technology Jiangsu Co ltd
Current assignee: Mercer Intelligent Technology Jiangsu Co ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-10-29
Anticipated expiration: 2031-04-15

Abstract

The application relates to a check valve and use valve block of this check valve thereof is applied to check valve technical field, and it includes valve barrel and disk seat, the disk seat sets up in the valve barrel, the pressure release hole has been seted up on the disk seat, wear to be equipped with the valve rod on the disk seat, the one end that the disk seat was kept away from to the valve rod is equipped with the closing plate that is used for sealed import, be equipped with between closing plate and the disk seat and support tight spring, support tight spring's one end and contradict on the closing plate, the other end contradict in on the disk seat. This application can reach the effect of pressure release through the pressure release hole to it is too big to reduce the pressure between disk seat and the valve piece, and the condition that leads to the unable normal backspace of valve rod takes place, and hydraulic oil between disk seat and the valve piece can cushion the valve rod simultaneously, has slowed down the translation rate of valve rod, increases the stability that the valve rod removed, so that the closing plate is normal to be opened.

Description

Check valve and valve block using same

Technical Field

The application relates to the technical field of one-way valves, in particular to a one-way valve and a valve block using the same.

Background

The one-way valve is characterized in that fluid can only flow along the water inlet, and the medium at the water outlet cannot flow back. For preventing reverse flow of oil in hydraulic systems or for preventing reverse flow of compressed air in pneumatic systems.

Referring to fig. 7 and 8, the check valve in the related art includes a valve housing 1, the valve housing 1 is a cylinder with an opening at one end, an inlet 101 is formed in a bottom wall of the valve housing 1, an outlet 102 is formed in a side wall of the valve housing 1, the valve housing 1 is provided with a valve seat 11 at one side of the outlet 102 away from the inlet 101, a valve rod 12 is arranged on the valve seat 11 in a penetrating manner, a sealing plate 13 used for sealing the inlet 101 is arranged at one end of the valve rod 12 away from the valve seat 11, a resisting spring 14 is sleeved on the valve rod 12, one end of the resisting spring 14 is abutted to the valve seat 11, the other end of the resisting spring is abutted to the sealing plate 13, and when the check valve is used, the positioning plate 21 is usually arranged at an opening end of the valve housing 1 to seal the valve housing 1.

In view of the above related technologies, the inventor believes that, in the use process of the check valve, hydraulic oil flowing through the valve sleeve easily permeates between the valve seat and the end cover through a gap between the valve rod and the valve seat, and after the gap between the valve seat and the end cover is filled with the hydraulic oil, the valve rod extrudes the hydraulic oil in the process of retreating the valve rod, and at the moment, the pressure between the valve seat and the end cover is increased, so that the sealing plate cannot be normally opened.

SUMMERY OF THE UTILITY MODEL

In order to improve and fill up the problem that hydraulic oil was normally opened after filling up between disk seat and the end cover, this application provides a check valve and applied this check valve's valve block.

In a first aspect, the present application provides a base, which adopts the following technical scheme:

the utility model provides a check valve, includes valve barrel and disk seat, the disk seat sets up in the valve barrel, the pressure release hole has been seted up on the disk seat, wear to be equipped with the valve rod on the disk seat, the one end that the disk seat was kept away from to the valve rod is equipped with the closing plate that is used for sealed import, be equipped with between closing plate and the disk seat and support tight spring, support tight spring's one end and contradict on the closing plate, the other end contradict in on the disk seat.

Through adopting above-mentioned technical scheme, the check valve is when using, the operator installs the check valve in the valve piece, when hydraulic oil passes through the check valve, hydraulic oil is under the pressure effect of self, promote the closing plate and break away from the import, make the closing plate drive the valve rod and retreat, and the valve rod extrudees the hydraulic oil between disk seat and the valve piece, hydraulic oil between disk seat and the valve piece can flow back in the valve sleeve through the pressure release hole this moment, thereby the pressure release hole has reached the effect of pressure release, and then it is too big to reduce the pressure between disk seat and the valve piece, the condition that leads to the unable normal back-off of valve rod takes place, hydraulic oil between disk seat and the valve piece can cushion the valve rod simultaneously, the moving speed of valve rod has been slowed down, the stability that the valve rod removed, so that the closing plate is normal to be opened.

Optionally, a guide cylinder is arranged on one side, facing the sealing plate, of the valve seat, the valve rod penetrates through the guide cylinder, and the abutting spring is sleeved on the guide cylinder.

Through adopting above-mentioned technical scheme, the gliding in-process of valve rod on the disk seat, the guide cylinder restricts the moving direction of valve rod for the guide bar is linear motion, thereby the guide cylinder has played the effect of direction to the valve rod, and then the stability when increasing the valve rod and removing, so that the closing plate carries out accurate sealed to the import.

Optionally, the inner wall of the guide cylinder is embedded with a rubber ring, and the valve rod is sleeved with the rubber ring.

Through adopting above-mentioned technical scheme, set up the compliance that the rubber circle can increase between valve rod and the guide cylinder, be favorable to reducing the frictional force between valve rod and the guide cylinder inner wall to stability when further having increased the valve rod and removing, smoothness degree when in order to promote the valve rod and remove.

Optionally, a positioning column is arranged on one side, facing the valve seat, of the sealing plate, and the abutting spring is sleeved on the positioning column.

Through adopting above-mentioned technical scheme, set up the reference column and can fix a position to supporting tight spring to the increase is supported tight spring and sealing plate be connected stably, with the reduction support tight spring appear rocking the possibility on the valve rod, and be convenient for support the more stable release elastic force of tight spring, and then improved the atress degree of consistency of sealing plate, take place with the reduction sealing plate by the circumstances of pushing up partially, the valve rod of being convenient for simultaneously and disk seat centering.

Optionally, one side of the sealing plate facing the inlet is provided with an inclined surface, and the inclined surface is arranged along the peripheral direction of the sealing plate.

Through adopting above-mentioned technical scheme, the closing plate is at the in-process that seals the import, and the inclined plane is inconsistent with the edge of import, and the inclined plane can lead the closing plate this moment to be convenient for the closing plate carry out accurate sealed to the import, and then improved the leakproofness of closing plate to the import, the inclined plane has reduced the area of contact of closing plate with the valve barrel diapire simultaneously, and then be convenient for sealed piece and the marginal abundant contact of import, so as to carry out abundant sealed to the import.

Optionally, the valve seat is screwed on the valve sleeve.

Through adopting above-mentioned technical scheme, disk seat threaded connection makes things convenient for the operator to fix the disk seat on the valve sleeve to the operator of being convenient for adjusts the position of disk seat, and the disk seat can extrude supporting tight spring this moment, so as to reach the effect of adjusting to support tight spring elastic force, and operator's reverse operation can be dismantled the disk seat simultaneously, so that the operator is to supporting tight spring and change.

Optionally, one side of the valve seat, which is away from the sealing plate, is provided with a dismounting groove, and the pressure relief hole is formed in the bottom wall of the dismounting groove.

Through adopting above-mentioned technical scheme, when the operator need dismantle the disk seat, the operator pegs graft the extracting tool in the dismouting groove to rotate the disk seat through the dismouting groove, and then improved the convenience of disk seat dismouting, the operator of being convenient for is quick convenient dismantles the disk seat.

In a second aspect, the present application provides a valve block, which adopts the following technical solution:

a valve block comprises a seat body, wherein one end of the seat body is provided with a mounting hole, a valve sleeve is arranged in the mounting hole, the seat body is provided with a positioning plate for sealing the mounting hole, and a limiting part for fixing the positioning plate is arranged in the mounting hole; the valve sleeve is characterized in that a liquid inlet and a liquid outlet which are communicated with the mounting hole at the same time are formed in the seat body, the liquid inlet is communicated with an inlet of the valve sleeve, and the liquid outlet is communicated with an outlet of the valve sleeve.

Through adopting above-mentioned technical scheme, the valve piece is at the in-process that uses, the operator installs the check valve in the mounting hole, the inner wall of mounting hole and the outside wall of valve barrel laminate mutually this moment, in the mounting hole is placed with the locating plate to the operator then, and contradict the locating plate in the open end of valve barrel, thereby fix the check valve, in the operator is fixed the locating part to the mounting hole after that, make the locating part fix the locating plate, and operator's reverse operation can dismantle the check valve, so that the operator changes the check valve.

Optionally, the limiting part includes a clamp spring, a limiting groove for fixing the clamp spring is formed in the side wall of the mounting hole, and the clamp spring is embedded in the limiting groove.

Through adopting above-mentioned technical scheme, at the in-process of fixed positioning board, the operator inlays the jump ring and establishes the spacing groove, and partial jump ring is contradicted on the locating plate this moment to reach the effect of fixed positioning board, thereby increase the firm in connection nature between locating plate and the pedestal, and then reduce the condition emergence that the locating plate breaks away from in the mounting hole.

Optionally, the limiting member includes a positioning pin, a sliding groove is formed in a side wall of the positioning plate along the circumferential direction, the positioning pin is slidably disposed in the sliding groove, a return spring is disposed on a bottom wall of the sliding groove, and one end of the return spring, which is far away from the bottom wall of the sliding groove, abuts against the positioning pin; one side, away from the valve sleeve, of the positioning plate is provided with a waist-shaped hole communicated with the sliding groove, the waist-shaped hole is formed along the length direction of the sliding groove, a shifting rod is arranged in the waist-shaped hole in a sliding mode, and the shifting rod is installed on the positioning pin; the side wall of the mounting hole is provided with a positioning groove, and when the positioning plate is abutted against the valve sleeve, part of the positioning pin is inserted into the positioning groove.

Through adopting above-mentioned technical scheme, at the in-process of fixed positioning board, the operator stirs the driving lever earlier and slides in waist shape hole, the driving lever drives the locating pin and slides in the spout this moment, and compress reset spring, reset spring has elastic restoring force by compression, when getting into the spout completely until the locating pin, the operator places the locating plate in the mounting hole, and align spout and spacing groove, make reset spring under the effect of elastic restoring force, promote the locating pin and peg graft in the constant head tank, the constant head tank fixes the locating plate through the locating pin this moment, thereby increase the stability of being connected of locating plate and pedestal, and then the operator of being convenient for installs the locating plate fast convenient.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the pressure relief effect can be achieved through the pressure relief hole, so that the situation that the valve rod cannot normally retreat due to overlarge pressure between the valve seat and the valve block is reduced, meanwhile, the hydraulic oil between the valve seat and the valve block can buffer the valve rod, the moving speed of the valve rod is reduced, the moving stability of the valve rod is improved, and a sealing plate can be conveniently and normally opened;

2. the valve rod is guided by the guide cylinder, so that the stability of the valve rod during movement can be improved, and the sealing plate can accurately seal an inlet;

3. fix the locating plate through the locating part, can increase the stability of being connected of locating plate and pedestal to the operator is quick convenient installs the locating plate, makes things convenient for the operator to change the check valve.

Drawings

Fig. 1 is a schematic view of the overall structure of a check valve according to embodiment 1 of the present application.

Fig. 2 is an overall sectional view of the check valve of embodiment 1 of the present application.

Fig. 3 is a schematic view of the overall structure of the valve block of embodiment 1 of the present application.

Fig. 4 is an overall sectional view of the valve block of embodiment 1 of the present application.

Fig. 5 is an overall sectional view of the valve block of embodiment 2 of the present application.

Fig. 6 is an enlarged schematic view of a portion a in fig. 5.

Fig. 7 is a schematic view of the overall structure of a related art check valve.

Fig. 8 is an overall sectional view of a related art check valve.

Description of reference numerals: 1. a valve housing; 101. an inlet; 102. an outlet; 11. a valve seat; 111. a pressure relief vent; 112. disassembling and assembling the groove; 12. a valve stem; 13. a sealing plate; 131. a bevel; 14. the spring is tightly propped; 15. a guide cylinder; 151. a rubber ring; 16. a positioning column; 2. a base body; 201. mounting holes; 202. a limiting groove; 203. a liquid inlet; 204. a liquid outlet; 205. a buffer tank; 206. mounting grooves; 207. positioning a groove; 21. positioning a plate; 211. a chute; 212. a waist-shaped hole; 22. a seal ring; 3. a limiting member; 31. a clamp spring; 32. positioning pins; 33. a return spring; 34. a deflector rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

Example 1

The embodiment of the application discloses a check valve.

Referring to fig. 1 and 2, the check valve includes a valve housing 1, a valve seat 11, a valve rod 12, a sealing plate 13 and a biasing spring 14, the valve housing 1 is a circular cylinder with an opening at one end, and an inlet 101 for hydraulic oil to enter is formed in the bottom wall of the valve housing 1. Two outlets 102 are formed in the side wall of the valve housing 1 along the circumferential direction, the two outlets 102 are both located in the middle of the valve housing 1, and the two outlets 102 are symmetrically arranged along the axis of the valve housing 1. The valve seat 11 is in threaded connection with one end of the valve housing 1 far away from the inlet 101, the valve rod 12 is arranged on the valve seat 11 in a penetrating mode and arranged on the valve seat 11 in a sliding mode, and the valve rod 12 and the valve seat 11 are coaxial. The sealing plate 13 is fixed at one end of the valve rod 12 facing the inlet 101, and the sealing plate 13 and the valve rod 12 are coaxial. The abutting spring 14 is sleeved on the valve rod 12, one end of the abutting spring 14 abuts against the valve seat 11, and the other end abuts against the sealing plate 13, so that the sealing plate 13 is pushed to seal the inlet 101, and the possibility of backflow of hydraulic oil is avoided.

Check valve during use, hydraulic oil flows into the valve housing 1 through the inlet 101. At this time, the hydraulic oil pushes the sealing plate 13 to move to the side away from the inlet 101, and drives the valve rod 12 to retreat. After entering the valve housing 1, the hydraulic oil flows out through the outlet 102.

Referring to fig. 1 and 2, the sealing plate 13 is provided with an inclined surface 131 along a circumferential direction on one side of the inlet 101, and when the sealing plate 13 seals the inlet 101, an edge of the inlet 101 collides with the inclined surface 131, and the inclined surface 131 guides the sealing plate 13, so that the sealing plate 13 can precisely seal the inlet 101, and the tightness between the inlet 101 and the sealing plate 13 can be improved.

Meanwhile, one side, away from the inlet 101, of the sealing plate 13 is provided with a positioning column 16, the positioning column 16 is coaxial with the valve rod 12, and the valve rod 12, the positioning column 16 and the sealing plate 13 are integrally formed. The diameter of the positioning post 16 is equal to the inner diameter of the resisting spring 14, and the resisting spring 14 is sleeved on the positioning post 16, so that the positioning post 16 has a positioning effect on the resisting spring 14, and further, the stability of the resisting spring 14 is increased, so that the resisting spring 14 can release elastic force more stably. Meanwhile, the stress uniformity of the sealing plate 13 is improved, so that the situation that the sealing plate 13 is biased by the abutting spring 14 is reduced.

Referring to fig. 1 and 2, a guide cylinder 15 coaxial with the valve seat 11 is provided on a side of the valve seat 11 facing the sealing plate 13, and the guide cylinder 15 is integrally formed with the valve seat 11. And the diameter of the guide cylinder 15 is the same as that of the positioning column 16, so as to achieve the effect of further fixing the abutting spring 14. Valve rod 12 wears to locate in guide cylinder 15, and valve rod 12 and guide cylinder 15 are clearance fit to be convenient for the quick clearance of following of small impurity in the hydraulic oil to pass through, take place with the condition that reduces small impurity and cause valve rod 12 jamming.

Meanwhile, the inner wall of the guide cylinder 15 is embedded with two rubber rings 151, and the number of the rubber rings 151 is two along the axis of the guide cylinder 15. Rubber circle 151 is made by the rubber material, and rubber self is softer and have elasticity to rubber circle 151 can increase the compliance between valve rod 12 and the guide cylinder 15, and then can increase the compactness between valve rod 12 and the guide cylinder 15, has played the effect of direction to valve rod 12, with stability when promoting valve rod 12 and removing.

Referring to fig. 1 and 2, a plurality of dismouting groove 112 has been seted up to the one end that the valve seat 11 deviates from import 101, and a plurality of dismouting groove 112 can set up to three, and three dismouting groove 112 along the circumferencial direction evenly distributed of valve seat 11 to make things convenient for operator's use tool to dismantle valve seat 11. Meanwhile, the valve seat 11 is provided with a pressure relief hole 111 communicated with the inner cavity of the valve sleeve 1 on the bottom wall of the dismounting groove 112, so that hydraulic oil can flow in the whole valve sleeve 1 conveniently, the possibility that the pressure is too high on one side of the valve seat 11 departing from the sealing plate 13 is reduced, and the sealing plate 13 can be opened normally.

The implementation principle of the one-way valve in the embodiment of the application is as follows: check valve during use hydraulic oil needs to enter the valve housing 1 through the inlet 101. When hydraulic oil enters the valve housing 1, the hydraulic oil pushes the sealing plate 13 to be separated from the inlet 101, so that the hydraulic oil enters the valve housing 1. At this time, part of the hydraulic oil is liable to seep through the gap between the guide sleeve 15 and the valve rod 12 to the side of the valve seat 11 facing away from the sealing plate 13. Then the sealing plate 13 pushes the valve rod 12 to extrude the hydraulic oil on the side, away from the sealing plate 13, of the valve seat 11, so that the hydraulic oil flows back to the inner cavity of the valve sleeve 1 through the pressure relief hole 111, the possibility of pressure holding on the side, away from the sealing plate 13, of the valve seat 11 is avoided, and the sealing plate 13 is conveniently and normally opened.

Meanwhile, the sealing plate 13 compresses the abutting spring 14, and when the hydraulic oil flows back, the abutting spring 14 pushes the sealing plate 13 to seal the inlet 101 under the action of elastic restoring force, so that the possibility of backflow of the hydraulic oil is avoided, and a hydraulic system is protected.

The embodiment of the application also discloses a valve block.

Referring to fig. 3 and 4, the valve block includes a seat body 2, and the seat body 2 has a rectangular parallelepiped shape. The mounting hole 201 that is used for installing the check valve is seted up along length direction's one end to pedestal 2, and inlet 203 has been seted up to one side that pedestal 2 kept away from the mounting hole 201 open end, and inlet 203 is used for hydraulic system to communicate, and inlet 203 and mounting hole 201 intercommunication. Two liquid outlets 204 are formed in one side of the base body 2 along the length direction, one of the liquid outlets 204 is directly communicated with the liquid inlet 203, and the other liquid outlet 204 is communicated with the liquid outlet 204 through the mounting hole 201.

Meanwhile, the inner wall of the mounting hole 201 is provided with a buffer groove 205 communicated with one of the liquid outlets 204 along the circumferential direction, and when the check valve is mounted in the mounting hole 201, the outlet 102 of the valve sleeve 1 is communicated with the buffer groove 205, so that the hydraulic oil flowing out of the outlet 102 can smoothly flow out of the liquid outlet 204. The seat body 2 is provided with an installation groove 206 at one end of the installation hole 201 far away from the liquid inlet 203, and the installation groove 206 and the installation hole 201 are coaxial. A positioning plate 21 for sealing the mounting hole 201 is arranged in the mounting groove 206, and a sealing ring 22 abutting against the inner wall of the mounting groove 206 is embedded in the positioning plate 21 along the peripheral direction. The sealing ring 22 is made of rubber, the rubber is soft and elastic, and deformation is easy to generate, so that the sealing ring 22 can fill the gap between the positioning plate 21 and the mounting groove 206 to increase the sealing performance between the positioning plate 21 and the mounting groove 206.

Referring to fig. 3 and 4, a limiting member 3 for fixing the positioning plate 21 is disposed in the mounting groove 206, and the limiting member 3 includes a clamp spring 31. An annular limiting groove 202 is formed in the side wall of the mounting groove 206 in the circumferential direction, and the limiting groove 202 is located on one side of the positioning plate 21 away from the one-way valve. In the process of fixing the one-way valve, an operator inserts the inlet 101 of the one-way valve into the mounting hole 201, so that the inlet 101 can be communicated with the liquid inlet 203. Then, the operator places the positioning plate 21 into the mounting groove 206 so that the positioning plate 21 abuts against the open end of the valve housing 1 to achieve the effect of fixing the check valve. Then the operator inlays jump ring 31 and locates in big spacing groove 202, and the spacing jump ring 31 of part is contradicted on locating plate 21 this moment to having played spacing effect to locating plate 21, and then increased locating plate 21 and pedestal 2's fastness to be connected. And the operator can take out the positioning plate 21 from the mounting groove 206 by reverse operation, so that the operator can replace the check valve conveniently.

Example 2

Referring to fig. 5 and 6, the difference between the present embodiment and embodiment 1 is that the limiting member 3 includes a positioning pin 32, a return spring 33 and a shift lever 34, two sliding slots 211 are formed on a side wall of the positioning plate 21 along the circumferential direction, the two sliding slots 211 are symmetrically arranged along the axis of the positioning plate 21, and the positioning pin 32, the return spring 33 and the shift lever 34 are provided with two sets, one set is matched with one of the sliding slots 211, and the other set is matched with the other sliding slot 211. The positioning pin 32 is slidably disposed in the sliding slot 211, and a part of the positioning pin 32 extends to the outside of the sliding slot 211. The return spring 33 is disposed in the slide groove 211, and one end of the return spring 33 is fixed to the bottom wall of the slide groove 211, and the other end is fixed to the positioning pin 32.

Meanwhile, the positioning plate 21 is provided with a waist-shaped hole 212 communicated with the sliding groove 211 on one side departing from the mounting hole 201, and the sliding groove 211 and the waist-shaped hole 212 are both arranged along the radial direction of the positioning plate 21. The shift lever 34 is inserted and slidably disposed in the slotted hole 212, and the shift lever 34 is fixed on the positioning pin 32.

Referring to fig. 5 and 6, the circumferential side wall of the mounting slot 206 is provided with an annular positioning slot 207, and the positioning slot 207 is located on a side of the positioning plate 21 facing away from the one-way valve. During the process of fixing the positioning plate 21, the operator simultaneously pulls the two levers 34 to move to the opposite side. At this time, the shift lever 34 drives the positioning pin 32 to compress the return spring 33, and the return spring 33 is compressed to have an elastic restoring force. Until the positioning pins 32 are completely inserted into the slide grooves 211, the operator places the positioning plate 21 into the mounting grooves 206 and aligns the slide grooves 211 with the positioning grooves 207. Then, the operator releases the shift lever 34, so that the return spring 33 pushes a portion of the positioning pin 32 to be inserted into the positioning slot 207 under the action of the elastic restoring force, and the positioning slot 207 limits the positioning pin 32, thereby achieving the effect of fixing the positioning plate 21. The operator can take the positioning plate 21 out of the mounting groove 206 by reverse operation.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A one-way valve characterized by: including valve barrel (1) and disk seat (11), disk seat (11) set up in valve barrel (1), pressure release hole (111) have been seted up on disk seat (11), wear to be equipped with valve rod (12) on disk seat (11), the one end that disk seat (11) were kept away from in valve rod (12) is equipped with closing plate (13) that are used for sealed import (101), be equipped with between closing plate (13) and disk seat (11) and support tight spring (14), support the one end of tight spring (14) and contradict on closing plate (13), the other end contradict in on disk seat (11).

2. The one-way valve of claim 1, wherein: one side of the valve seat (11) facing the sealing plate (13) is provided with a guide cylinder (15), the valve rod (12) penetrates through the guide cylinder (15), and the abutting spring (14) is sleeved on the guide cylinder (15).

3. The one-way valve of claim 2, wherein: the inner wall of guide cylinder (15) inlays and is equipped with rubber circle (151), on valve rod (12) were located to rubber circle (151) cover.

4. The one-way valve of claim 1, wherein: one side of the sealing plate (13) facing the valve seat (11) is provided with a positioning column (16), and the abutting spring (14) is sleeved on the positioning column (16).

5. The one-way valve of claim 1, wherein: the sealing plate (13) is provided with an inclined surface (131) towards one side of the inlet (101), and the inclined surface (131) is arranged along the peripheral direction of the sealing plate (13).

6. The one-way valve of claim 1, wherein: the valve seat (11) is in threaded connection with the valve sleeve (1).

7. The one-way valve of claim 1, wherein: the side, deviating from the sealing plate (13), of the valve seat (11) is provided with a dismounting groove (112), and the pressure relief hole (111) is formed in the bottom wall of the dismounting groove (112).

8. A valve block using the check valve of any one of claims 1 to 7, wherein: the valve sleeve is characterized by comprising a base body (2), wherein one end of the base body (2) is provided with a mounting hole (201), the valve sleeve (1) is arranged in the mounting hole (201), a positioning plate (21) used for sealing the mounting hole (201) is arranged on the base body (2), and a limiting part (3) used for fixing the positioning plate (21) is arranged in the mounting hole (201);

the valve seat is characterized in that a liquid inlet (203) and a liquid outlet (204) which are communicated with the mounting hole (201) simultaneously are formed in the seat body (2), the liquid inlet (203) is communicated with an inlet (101) of the valve sleeve (1), and the liquid outlet (204) is communicated with an outlet (102) of the valve sleeve (1).

9. The valve block of claim 8, wherein: the limiting piece (3) comprises a clamp spring (31), a limiting groove (202) used for fixing the clamp spring (31) is formed in the side wall of the mounting hole (201), and the clamp spring (31) is embedded in the limiting groove (202).

10. The valve block of claim 8, wherein: the limiting piece (3) comprises a positioning pin (32), a sliding groove (211) is formed in the side wall of the positioning plate (21) along the peripheral direction, the positioning pin (32) is arranged in the sliding groove (211) in a sliding mode, a return spring (33) is arranged on the bottom wall of the sliding groove (211), and one end, far away from the bottom wall of the sliding groove (211), of the return spring (33) abuts against the positioning pin (32);

one side, away from the valve sleeve (1), of the positioning plate (21) is provided with a waist-shaped hole (212) communicated with the sliding groove (211), the waist-shaped hole (212) is formed along the length direction of the sliding groove (211), a shifting rod (34) is arranged in the waist-shaped hole (212) in a sliding mode, and the shifting rod (34) is installed on the positioning pin (32);

a positioning groove (207) is formed in the side wall of the mounting hole (201), and when the positioning plate (21) abuts against the valve sleeve (1), part of the positioning pin (32) is inserted into the positioning groove (207).