CN112161089B - Waterproof hammer slow-closing check valve - Google Patents

Waterproof hammer slow-closing check valve Download PDF

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Publication number
CN112161089B
CN112161089B CN202010991158.5A CN202010991158A CN112161089B CN 112161089 B CN112161089 B CN 112161089B CN 202010991158 A CN202010991158 A CN 202010991158A CN 112161089 B CN112161089 B CN 112161089B
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Prior art keywords
valve
hole
rod
cover
valve core
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CN202010991158.5A
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CN112161089A (en
Inventor
李宗贤
王先菊
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Zhejiang Donghe Valve Manufacturing Co ltd
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Zhejiang Donghe Valve Manufacturing Co ltd
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Priority to CN202010991158.5A priority Critical patent/CN112161089B/en
Publication of CN112161089A publication Critical patent/CN112161089A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a water hammer preventing slow-closing check valve, which comprises a valve body, wherein a valve cavity is arranged in the valve body, a diaphragm is arranged in the valve cavity, the diaphragm divides the valve cavity into an upper valve cavity and a lower valve cavity, a valve cover is fixedly arranged at an opening at the upper end of the upper valve cavity, and an inlet pipe and an outlet pipe are arranged on the side surface of the valve body; a valve hole is formed in the diaphragm plate; the valve cover is internally provided with a piston hole, and the piston rod is provided with a shoulder which is in sliding connection with the piston hole; the cross-sectional area of the shoulder is A1, the cross-sectional area of the valve rod is A2, the cross-sectional area of the piston rod is A3, wherein A1-A2 = A3; the lower end of the piston rod is provided with a valve core for controlling the on-off of the valve hole, and the lower end of the piston rod is provided with a locking component and an unlocking component; the check valve is simple in structure, can be closed slowly, and prevents water hammer.

Description

Waterproof hammer slow-closing check valve
Technical Field
The invention belongs to the technical field of check valves, and particularly relates to a water hammer-proof slow-closing check valve.
Background
The check valve is a valve for preventing the medium from flowing backward by automatically opening and closing the valve flap depending on the flow of the medium itself. The check valve is an automatic valve and has the main functions of preventing the medium from flowing backwards, preventing the reverse rotation of the pump and the driving motor and preventing the medium in the container from leaking. The check valve is divided into three types of a lifting check valve, a swing check valve and a butterfly check valve according to the structure. The existing lifting check valve mainly comprises a valve body, a valve seat and a check valve core, when medium enters the inner cavity of the valve body from the inlet side of the valve (medium flows forward), the medium pushes the check valve core to rise to open, and when the medium enters the inner cavity of the valve body from the outlet side of the valve (medium flows reversely), the check valve core descends to close the valve port. The existing lifting check valve has the following problems in the use process: in the closing process of the check valve core, the too high closing speed can cause too large impact force of the valve core sealing surface to the valve seat sealing surface, and the sealing surface is easy to damage, so that the check valve cannot be effectively stopped, and the service life is reduced; meanwhile, when the check valve core is closed quickly, water hammer is easy to generate, and damage conditions such as damage to the valve are caused.
Disclosure of Invention
The invention aims to provide a check valve which is simple in structure and capable of achieving slow closing and preventing water hammer.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the waterproof hammer slow-closing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, a diaphragm is arranged in the valve cavity, the diaphragm divides the valve cavity into an upper valve cavity and a lower valve cavity, a valve cover is fixedly arranged at an opening at the upper end of the upper valve cavity, and an inlet pipe communicated with the lower valve cavity and an outlet pipe communicated with the upper valve cavity are arranged on the side surface of the valve body; a valve hole for communicating the upper valve cavity and the lower valve cavity is formed in the diaphragm plate; the valve cover is internally provided with a piston hole, the outer side of the piston rod close to the upper end is provided with a shoulder which is in sliding connection with the piston hole; the cross-sectional area of the shoulder is A1, the cross-sectional area of the valve rod is A2, the cross-sectional area of the piston rod is A3, wherein A1-A2 = A3; an upper chamber communicated with the upper valve cavity is formed between the shoulder and the upper end of the piston hole in the piston hole, a lower chamber is formed between the shoulder and the lower end of the piston hole, and the lower chamber is filled with compressible gas; the lower extreme of piston rod is equipped with the case that is used for controlling the valve opening break-make, the lower extreme of piston rod is equipped with locking subassembly and unblock subassembly, locking subassembly is used for locking the case with the piston rod together when the valve opening is opened completely to the case, unblock subassembly is used for when the case is close to the valve opening, and the case is separated with the piston rod unblock.
Further, the lower end of the piston rod is provided with a shaft hole, the locking assembly comprises a locking rod with a square cross section, a radial sliding hole is formed in the position, close to the shaft hole, of the upper end of the piston rod in the radial direction of the shaft hole, and a communication hole used for communicating the radial sliding hole and the shaft hole, the locking rod is slidably connected in the communication hole, one end of the locking rod extends into the shaft hole, the other end of the locking rod extends into the radial sliding hole, a flange is arranged on the outer side of the locking rod, extending into the radial sliding hole, a first spring used for forcing the flange to move the locking rod into the shaft hole is arranged between the flange and the telecentric end of the radial sliding hole, and a first inclined surface is formed at one end of the locking rod, extending into the shaft hole;
the unlocking component comprises a shaft rod which is connected with the shaft hole in a sliding way, and the lower end of the shaft rod extends out of the shaft hole and is provided with an unlocking cover; a lower sliding hole with an opening at the lower end and an upper sliding hole with an opening at the upper end are arranged in the shaft rod; the valve core is positioned in the unlocking cover, the upper end of the valve core is provided with a lower sliding rod extending into the lower sliding hole, the upper end of the lower sliding rod is provided with an upper sliding rod extending into the upper sliding hole, the upper end of the upper sliding rod is provided with a convex cover positioned at the upper end of the shaft rod, and a second spring for forcing the convex cover to move upwards is arranged between the convex cover and the lower end of the upper sliding hole in the upper sliding hole; the gravity of the valve core is larger than the pretightening force of the second spring;
when the check valve is opened, the valve core drives the convex cover to move upwards, when the valve core abuts against the unlocking cover, the valve core drives the unlocking cover to move upwards, when the convex cover abuts against the first inclined plane, the convex cover drives the convex cover to move upwards along with the valve core, the convex cover pushes the lock rod to compress the first spring to retract into the communication hole, and when the valve core completely opens the valve hole, the lock rod resets under the action of the first spring and stretches into the lower part of the convex cover; when the check valve is closed, the valve core drives the piston rod to move downwards, when the lower end of the unlocking cover is abutted against the diaphragm plate, the shaft rod moves upwards relative to the valve core along with the downward movement of the valve core, when the valve core is close to the valve hole, the upper end of the shaft rod is abutted against the first inclined surface, along with the downward movement of the valve core, the shaft rod pushes the lock rod to compress the first spring to retract into the communication hole, the upper end of the shaft rod is abutted against the lower end of the convex cover, and the piston rod moves upwards under the action of compressible gas.
Further, a through hole is formed in the unlocking cover.
Further, a first cavity is arranged between the upper end of the lower sliding rod and the upper end of the lower sliding hole in the lower sliding hole, and a first through hole used for communicating the first cavity with the upper valve cavity is arranged in the shaft rod.
Further, the lower end of the valve core is provided with an annular sealing ring.
Further, a second through hole used for communicating the upper valve cavity and the upper cavity is formed in the valve cover.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the invention, the compressible gas is filled in the lower cavity, when the valve core closes the valve hole, the valve core drives the piston rod to move downwards, so that the valve core is prevented from being rapidly closed, the phenomenon of damage to the sealing surface caused by too large impact force is prevented, and the service life of the check valve is prolonged;
2. according to the invention, the compressible gas is filled in the lower cavity, so that when the valve core closes the valve hole, the valve core is prevented from being quickly closed, the occurrence of water hammer is prevented, and the valve is protected from damage such as damage;
3. the valve core is only buffered in the closing process of the valve core, no acting force is generated on the valve core when the valve core is opened, and the piston rod is separated from the valve core when the valve core is completely closed, so that the sealing performance of the valve core is not affected when the valve core is closed.
Drawings
FIG. 1 is a cross-sectional view of the present invention with the valve spool in a closed position;
FIG. 2 is a cross-sectional view of the invention when fully opened;
FIG. 3 is a cross-sectional view of the invention with the unlock cover moved to the bottom when closed;
fig. 4 is a cross-sectional view of the present invention with the valve spool moved to the closed position and the piston rod disengaged from the valve spool.
Detailed Description
Referring to fig. 1-4, a water hammer preventing slow closing check valve comprises a valve body 1, wherein a valve cavity is arranged in the valve body 1, a diaphragm 11 is arranged in the valve cavity, the diaphragm 11 divides the valve cavity into an upper valve cavity 13 and a lower valve cavity 14, a valve cover 2 is fixedly arranged at an opening at the upper end of the upper valve cavity 13, and an inlet pipe 15 communicated with the lower valve cavity 14 and an outlet pipe 16 communicated with the upper valve cavity 13 are arranged on the side surface of the valve body 1; a valve hole 12 for communicating the upper valve cavity 13 and the lower valve cavity 14 is arranged in the diaphragm 11; the valve cover 2 is in sliding connection with a piston rod 3, the lower end of the piston rod 3 extends into the upper valve cavity 13, the upper end of the piston rod 3 is provided with a valve rod 31 extending out of the valve cover 2, the outer side of the piston rod 3 in the valve cover 2 is provided with a piston hole 21, and the outer side of the piston rod 3 close to the upper end is provided with a shoulder 32 in sliding connection with the piston hole 21; the cross-sectional area of the shoulder 32 is A1, the cross-sectional area of the valve rod 31 is A2, and the cross-sectional area of the piston rod 3 is A3, wherein a1—a2=a3; an upper chamber 2b communicated with the upper valve cavity 13 is formed between the shoulder 32 and the upper end of the piston hole 21 in the piston hole 21, a lower chamber 2a is formed between the shoulder 32 and the lower end of the piston hole 21, and the lower chamber 2a is filled with compressible gas; the valve cover 2 is internally provided with a second through hole 22 for communicating the upper valve cavity 13 and the upper chamber 2 b; the lower extreme of piston rod 3 is equipped with the case 5 that is used for controlling valve opening 12 break-make, the lower extreme of piston rod 3 is equipped with locking subassembly and unblock subassembly, locking subassembly is used for locking case 5 and piston rod 3 together when case 5 opens valve opening 12 completely, unblock subassembly is used for when case 5 is close to valve opening 12, unblock separation with case 5 and piston rod 3.
The lower extreme of piston rod 3 is equipped with shaft hole 3a, locking subassembly includes that the cross section is square locking lever 7, be equipped with radial slide hole 3b along the radial of shaft hole 3a in the upper end position that is close to shaft hole 3a in the piston rod 3 to and be used for the communication hole 3c of radial slide hole 3b and shaft hole 3a, locking lever 7 sliding connection is in communication hole 3c and one end stretches into in the shaft hole 3a, the other end stretches into in the radial slide hole 3b, locking lever 7 extends in the outside that stretches into in the radial slide hole 3b and is equipped with flange 7a, radial slide hole 3b is equipped with between flange 7a and radial slide hole 3 b's distal end and is used for forcing flange 7a to drive locking lever 7 to stretch to the first spring 8 in the shaft hole 3a, locking lever 7 is equipped with first inclined plane 71 in the one end that stretches into in the shaft hole 3 a.
The unlocking component comprises a shaft lever 4 which is connected with the shaft hole 3a in a sliding way, a second inclined surface 4a matched with the first inclined surface 71 is arranged at the upper end of the shaft lever 4, and the lower end of the shaft lever 4 extends out of the shaft hole 3a and is provided with an unlocking cover 41; a lower sliding hole 42 with an opening at the lower end and an upper sliding hole 43 with an opening at the upper end are arranged in the shaft lever 4; the valve core 5 is positioned in the unlocking cover 41, the upper end of the valve core is provided with a lower sliding rod 55 extending into the lower sliding hole 42, the upper end of the lower sliding rod 55 is provided with an upper sliding rod 56 extending into the upper sliding hole 43, the upper end of the upper sliding rod 56 is provided with a convex cover 51 positioned at the upper end of the shaft lever 4, and a second spring 6 for forcing the convex cover 51 to move upwards is arranged between the convex cover 51 and the lower end of the upper sliding hole 43 in the upper sliding hole 43; the gravity of the valve core 5 is larger than the pretightening force of the second spring 6.
When the check valve is opened, the valve core 5 drives the convex cover 51 to move upwards, when the valve core 5 is abutted against the unlocking cover 41, the valve core 5 drives the unlocking cover 41 to move upwards, when the convex cover 51 is abutted against the first inclined plane 71, the convex cover 51 is driven to move upwards along with the valve core 5, the convex cover 51 pushes the lock rod 7 to compress the first spring 8 to retract into the communication hole 3c, and when the valve core 5 completely opens the valve hole 12, the lock rod 7 is reset under the action of the first spring 8 and stretches into the lower part of the convex cover 51; when the check valve is closed, the valve core 5 drives the piston rod 3 to move downwards, when the lower end of the unlocking cover 41 is abutted against the diaphragm 11, the shaft lever 4 moves upwards relative to the valve core 5 along with the downward movement of the valve core 5, when the valve core 5 is close to the valve hole 12, the upper end of the shaft lever 4 is abutted against the first inclined surface 71, the shaft lever 4 pushes the lock rod 7 to compress the first spring 8 to retract into the communication hole 3c along with the downward movement of the valve core 5, the upper end of the shaft lever 4 is abutted against the lower end of the convex cover 51, and the piston rod 3 moves upwards under the action of compressible gas.
A through hole 402 is provided in the unlocking cover 41. A first cavity 222 is arranged between the upper end of the lower slide bar 55 and the upper end of the lower slide hole 42 in the lower slide hole 42, and a first through hole 401 for communicating the first cavity 222 with the upper valve cavity 13 is arranged in the shaft lever 4. The lower end of the valve core 5 is provided with an annular sealing ring 18.
According to the invention, by setting a1-a2=a3, the medium in the outlet pipe 16 enters the cavity chamber 2b on the cavity and acts on the annular area A1-A2 to form downward acting force on the piston rod 3, meanwhile, the medium in the outlet pipe 16 acts on the area A3 to generate upward acting force on the piston rod 3, and the resultant force of the medium in the outlet pipe 16 on the piston rod 3 is 0 because of the fact that the medium in the outlet pipe 16 is subjected to the acting force of the gas pressure in the lower cavity chamber 2a, and the piston rod 3 is only subjected to the acting force of the gas pressure in the lower cavity chamber 2 a. At the same time, the resultant force of the medium of the outlet pipe 16 acting on the unlocking hood is also 0.
As shown in fig. 1, the valve core 5 is in a closed position, under the action of the air pressure in the lower chamber 2a, the shoulder 32 is in the uppermost position, when the medium flows into the inlet pipe 15, the valve core 5 moves upwards, the lower end of the unlocking cover is abutted against the diaphragm 11 under the action of the second spring 6, the convex cover 51 is separated from the upper end of the shaft rod 4, when the valve core 5 moves to the position shown in fig. 2, the locking rod 7 is retracted outwards into the communication hole 3c against the action of the first spring 8 through the cooperation of the first inclined surface 71 of the locking rod 7 and the convex cover 51, and when the convex cover 51 moves above the locking rod 7, the locking rod 7 extends inwards under the action of the first spring 8 and is clamped between the upper end of the shaft rod 4 and the convex cover 51, so that the piston rod 3, the unlocking cover and the valve core 5 are connected together.
When the medium in the inlet pipe 15 stops flowing in, under the pressure of the outlet pipe 16 and the gravity action of the valve core 5, the valve core 5 drives the piston rod 3 and the unlocking cover to move downwards, and the compressible gas pressure in the lower chamber 2a is increased due to the volume reduction of the lower chamber 2a, so that the closing of the valve core 5 is blocked, and the closing speed of the valve core 5 is delayed; when the valve core 5 drives the unlocking cover to move to the position shown in fig. 3, the lower end of the unlocking cover collides with the diaphragm 11 and cannot move downwards continuously, the valve core 5 drives the piston rod 3 to move downwards continuously, the lock rod 7 is retracted outwards into the communication hole 3c through the cooperation of the second inclined surface 4a and the first inclined surface 71, when the valve core 5 moves to the fully closed position, as shown in fig. 4, the upper end of the shaft rod 4 is buckled with the convex cover 51, the valve core 5 and the piston rod 3 are unlocked, and the piston rod 3 moves upwards to the position of fig. 1 under the pressure action in the lower cavity 2 a. Thus, when the valve element 5 is in the closed position, the pressure of the lower chamber 2a does not exert an upward force on the valve element 5, and thus the sealing performance of the valve element 5 when closed is not affected.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (3)

1. The waterproof hammer slow-closing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, a diaphragm is arranged in the valve cavity, the diaphragm divides the valve cavity into an upper valve cavity and a lower valve cavity, a valve cover is fixedly arranged at an opening at the upper end of the upper valve cavity, and an inlet pipe communicated with the lower valve cavity and an outlet pipe communicated with the upper valve cavity are arranged on the side surface of the valve body; a valve hole for communicating the upper valve cavity and the lower valve cavity is formed in the diaphragm plate; the valve is characterized in that a piston rod with the lower end extending into the upper valve cavity is connected in the valve cover in a sliding manner, the upper end of the piston rod is provided with a valve rod extending out of the valve cover, a piston hole is formed in the outer side of the piston rod in the valve cover, and a shoulder connected in the piston hole in a sliding manner is arranged on the outer side, close to the upper end, of the piston rod; the cross-sectional area of the shoulder is A1, the cross-sectional area of the valve rod is A2, the cross-sectional area of the piston rod is A3, wherein A1-A2 = A3; an upper chamber communicated with the upper valve cavity is formed between the shoulder and the upper end of the piston hole in the piston hole, a lower chamber is formed between the shoulder and the lower end of the piston hole, and the lower chamber is filled with compressible gas; the lower end of the piston rod is provided with a valve core for controlling the on-off of the valve hole, the lower end of the piston rod is provided with a locking component and an unlocking component, the locking component is used for locking the valve core and the piston rod together when the valve core completely opens the valve hole, and the unlocking component is used for unlocking and separating the valve core and the piston rod when the valve core approaches the valve hole;
the locking assembly comprises a locking rod with a square cross section, a radial sliding hole and a communication hole are formed in the position, close to the upper end of the shaft hole, of the piston rod in the radial direction of the shaft hole, the communication hole is used for communicating the radial sliding hole and the shaft hole, the locking rod is slidably connected in the communication hole, one end of the locking rod extends into the shaft hole, the other end of the locking rod extends into the radial sliding hole, a flange is arranged on the outer side of the locking rod extending into the radial sliding hole in an extending mode, a first spring used for forcing the flange to move the locking rod to extend into the shaft hole is arranged between the flange and the distal end of the radial sliding hole, and a first inclined surface is formed at one end of the locking rod extending into the shaft hole;
the unlocking component comprises a shaft rod which is connected with the shaft hole in a sliding way, and the lower end of the shaft rod extends out of the shaft hole and is provided with an unlocking cover; a lower sliding hole with an opening at the lower end and an upper sliding hole with an opening at the upper end are arranged in the shaft rod; the valve core is positioned in the unlocking cover, the upper end of the valve core is provided with a lower sliding rod extending into the lower sliding hole, the upper end of the lower sliding rod is provided with an upper sliding rod extending into the upper sliding hole, the upper end of the upper sliding rod is provided with a convex cover positioned at the upper end of the shaft rod, and a second spring for forcing the convex cover to move upwards is arranged between the convex cover and the lower end of the upper sliding hole in the upper sliding hole; the gravity of the valve core is larger than the pretightening force of the second spring;
when the check valve is opened, the valve core drives the convex cover to move upwards, when the valve core abuts against the unlocking cover, the valve core drives the unlocking cover to move upwards, when the convex cover abuts against the first inclined plane, the convex cover drives the convex cover to move upwards along with the valve core, the convex cover pushes the lock rod to compress the first spring to retract into the communication hole, and when the valve core completely opens the valve hole, the lock rod resets under the action of the first spring and stretches into the lower part of the convex cover; when the check valve is closed, the valve core drives the piston rod to move downwards, when the lower end of the unlocking cover is abutted against the diaphragm plate, the shaft rod moves upwards relative to the valve core along with the downward movement of the valve core, when the valve core is close to the valve hole, the upper end of the shaft rod is abutted against the first inclined surface, along with the downward movement of the valve core, the shaft rod pushes the lock rod to compress the first spring to retract into the communication hole, the upper end of the shaft rod is abutted against the lower end of the convex cover, and the piston rod moves upwards under the action of compressible gas;
a through hole is formed in the unlocking cover; a first cavity is arranged between the upper end of the lower sliding rod and the upper end of the lower sliding hole in the lower sliding hole, and a first through hole used for communicating the first cavity with the upper valve cavity is arranged in the shaft rod.
2. The water hammer preventing slow closing check valve according to claim 1, wherein the lower end of the valve core is provided with an annular sealing ring.
3. The water hammer preventing slow closing check valve according to claim 1, wherein a second through hole for communicating the upper valve cavity and the upper chamber is arranged in the valve cover.
CN202010991158.5A 2020-09-20 2020-09-20 Waterproof hammer slow-closing check valve Active CN112161089B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010991158.5A CN112161089B (en) 2020-09-20 2020-09-20 Waterproof hammer slow-closing check valve

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Application Number Priority Date Filing Date Title
CN202010991158.5A CN112161089B (en) 2020-09-20 2020-09-20 Waterproof hammer slow-closing check valve

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CN112161089A CN112161089A (en) 2021-01-01
CN112161089B true CN112161089B (en) 2023-05-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114382945B (en) * 2021-12-29 2024-02-27 无锡汇田水务科技有限公司 Valve core deflection type waterproof hammer valve
CN115978212B (en) * 2023-03-20 2023-05-16 天津市塘沽沃特斯阀门有限公司 Stop valve with non-return function

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240036A (en) * 1992-06-22 1993-08-31 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Check valve with poppet dashpot/frictional damping mechanism
CN105003694B (en) * 2015-07-17 2018-11-09 纽威石油设备（苏州）有限公司 Protecting against shock check-valves
CN110260002B (en) * 2019-08-01 2020-12-04 凯瑞特阀业有限公司 Check valve
CN111396394A (en) * 2020-03-30 2020-07-10 邵延荣 Locking oil cylinder

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