CN-224201183-U - Rotary-opening check valve with built-in slow-closing structure

CN224201183UCN 224201183 UCN224201183 UCN 224201183UCN-224201183-U

Abstract

The utility model relates to a swing check valve with a built-in slow-closing structure, which comprises a valve body, a valve clack, a rocker arm, a shifting fork and a valve cover, wherein the valve clack is fixedly connected with the rocker arm, the rocker arm is connected with the shifting fork through a cylindrical pin, the rocker arm can drive the valve clack to rotate, a slow-closing device is arranged in the valve body and comprises a support shaft, a support and a hook, the support is of a hollow structure so as to facilitate the valve clack to be normally opened and closed, U-shaped holes are formed in two sides of the support, the support shaft and the hook are placed in the U-shaped holes, an extension spring is arranged between the support shaft and the hook, and a sleeve is sleeved below the hook. When the valve is in a working state, the valve clack is changed from an opening state to a closing state, the valve clack is acted by self weight and reflux pressure and is acted by an extension spring, so that the valve clack is slowly closed, the valve clack is prevented from directly and rapidly falling back to be closed, the water hammer effect is avoided, and the service life of the valve is prolonged.

Inventors

TAN ZEMIN
SONG TAO
WANG ZHENGYIN
ZHANG YULONG
ZHOU ZUBIN
ZHANG YUN
Huang Tusen
Ye Aojie
FAN LIN

Assignees

湖北泰和流体控制技术股份有限公司

Dates

Publication Date: 20260505
Application Date: 20250514

Claims (7)

1. A swing check valve with a built-in slow-closing structure comprises a valve body (1), a valve clack (2), a rocker arm (3), a shifting fork (7) and a valve cover (8), wherein the valve clack (2) is fixedly connected with the rocker arm (3), the rocker arm (3) is connected with the shifting fork (7) through a cylindrical pin (6), the rocker arm (3) can drive the valve clack (2) to rotate, and the swing check valve is characterized in that a slow-closing device is arranged in the valve body (1) and comprises a supporting shaft (12), a support (15) and a hook (16), the support (15) is of a hollow structure, U-shaped holes (151) are formed in two sides of the support (15), the supporting shaft (12) and the hook (16) are placed in the U-shaped holes (151), a tension spring (14) is arranged between the supporting shaft (12) and the hook (16), and a sleeve (17) is sleeved below the hook (16).
2. The swing check valve with the built-in slow-closing structure according to claim 1, wherein the slow-closing structure is of a built-in structure, and the slow-closing device is fixedly connected with the inner wall of the valve cover (8) through a hexagonal nut (10) and a bolt (13).
3. The swing check valve with built-in slow closing structure as claimed in claim 1, wherein the upper surface of the rocker arm (3) is in contact with the lower surface of the sleeve (17) in the slow closing device.
4. The swing check valve with built-in slow closing structure as claimed in claim 1, wherein the end parts of the supporting shaft (12) and the hook (16) are provided with small holes (18).
5. The swing check valve with the built-in slow closing structure as claimed in claim 1, wherein the hook (16) comprises a rectangular plate, a cylindrical structural member is arranged below the rectangular plate, two grooves (161) are formed in the middle of the upper cylinder, two grooves (161) are formed in the corresponding positions of the supporting shaft (12) and the hook (16), one end of the tension spring (14) is sleeved in the groove (161) on the supporting shaft (12), and the other end of the tension spring is sleeved in the groove (161) on the hook (16).
6. The swing check valve with the built-in slow closing structure as claimed in claim 1 or 4, wherein the valve clack (2) is fixedly connected with the rocker arm (3) through a lock nut (5) and a gasket (4), and the rocker arm (3) is connected with the shifting fork (7) through a cylindrical pin (6).
7. The swing check valve with built-in slow closing structure as claimed in claim 1 or 5, wherein the rocker arm (3) is sleeved on the valve clack (2).

Description

Rotary-opening check valve with built-in slow-closing structure Technical Field The utility model belongs to the technical field of stop valves, and particularly relates to a swing check valve with a built-in slow-closing structure. Background The swing check valve is a one-way valve with the advantages of large opening, low cost, stability, reliability and the like, and because of the special structure in the swing check valve, the valve core in the swing check valve is quick in closing speed, can impact parts in a pipeline, is easy to accelerate the ageing and damage of parts, generates a water hammer phenomenon and reduces the service life of the parts. The existing slow-closing swing check valve mostly adopts a heavy hammer type, a slow-closing device is arranged outside a valve body, a swing arm and heavy hammer combined slow-closing device is arranged at the end part of a rotating shaft penetrating out of the valve body to generate a moment opposite to the closing direction of a valve clack so as to delay the closing time of the valve clack, and the structure is complex and the valve leakage point can be increased when the valve clack penetrates through the valve body. For example, chinese patent publication No. CN 221463016U discloses a low-temperature swing check valve capable of free check, which comprises a valve body, a valve clack, a rocker arm, a valve clack nut, a spring pin I, a spring pin II, a shifting fork, a hook, a valve rod, a cylindrical pin I, a cylindrical pin II and the like, wherein the valve clack is fixedly connected with the rocker arm through the valve clack nut, the rocker arm is fixedly connected with the shifting fork through the cylindrical pin, an extension spring is connected between the spring pin I and the spring pin II, and the valve rod is fixedly connected with the hook through an inner hexagon screw. The check valve is simple to operate and ingenious in structure, free check can be achieved in the LNG ship unloading process, and when the unloading arm pipeline is precooled or LNG is returned to be loaded, the valve clack can be lifted through the hand wheel operation, so that the pipeline full-diameter through flow is achieved. But the stop valve is lack of a slow closing structure, the valve clack is directly and rapidly closed to cause a water hammer effect, the total height is higher, an independent platform is required to be erected in site operation, a damping device is lack of a switch of the valve clack, and noise is larger in the application process. Disclosure of Invention Aiming at the problems in the prior art, the utility model provides the swing check valve with the built-in slow-closing structure, which reduces the running speed of a valve rod by arranging the heavy hammer device and the slow-closing oil cylinder assembly, plays a damping role, avoids the direct impact of a valve clack and a valve body when the valve is opened and closed, and prolongs the service life of the valve. The utility model provides a swing check valve with a built-in slow-closing structure, which comprises a valve body, a valve clack, a rocker arm, a shifting fork and a valve cover, wherein the valve clack is fixedly connected with the rocker arm, the rocker arm is connected with the shifting fork through a cylindrical pin, the rocker arm can drive the valve clack to rotate, a slow-closing device is arranged in the valve body and comprises a support shaft, a support and a hook, the support is of a hollow structure so as to facilitate the valve clack to be normally opened and closed, U-shaped holes are formed in two sides of the support, the support shaft and the hook are placed in the U-shaped holes, an extension spring is arranged between the support shaft and the hook, the acting force of the extension spring has a buffer effect on the valve clack when the valve clack is closed, and the extension springs with different specifications can be replaced according to different requirements, and a sleeve is sleeved below the hook. The slow-closing device is arranged in the valve body, so that the leakage point of the valve is reduced, the installation space of the valve is saved, and the support in the slow-closing device is of a hollow structure and does not influence the normal opening and closing of the valve clack. When the valve is in a working state, the valve clack is changed from an opening state to a closing state, the valve clack is acted by self weight and reflux pressure and is acted by an extension spring, so that the valve clack is slowly closed, the valve clack is prevented from directly and rapidly falling back to be closed, the water hammer effect is avoided, and the service life of the valve is prolonged. The valve is characterized in that the valve is provided with a valve cover, the valve cover is provided with a valve leakage point, the valve cover is provided with a valve opening and closing mechanism, the valve opening and closing mechanism is connected wit