CN218236275U - water hammer relief valve - Google Patents

Abstract

The utility model discloses a water hammer relief valve, which comprises a main valve, a first pilot valve and a second pilot valve; a first control pipeline is connected between a water inlet of the main valve and a water inlet of the first pilot valve, a second control pipeline is connected between the water inlet of the main valve and a water inlet of the second pilot valve, a control chamber of the main valve is respectively connected with the water inlet of the first pilot valve and the water inlet of the second pilot valve through a third control pipeline and a fourth control pipeline, a water outlet of the first pilot valve is connected with a first drainage pipeline, a water outlet of the second pilot valve is connected with a water outlet of the main valve through a second drainage pipeline, a ball valve is installed on the second drainage pipeline, a fifth control pipeline is connected between the water inlet of the main valve and the control chamber of the main valve, and a needle valve is installed on the fifth control pipeline. The water hammer type slow-closing valve can adapt to low-pressure and high-pressure working conditions, effectively increases the adjustable range of the pressure relief value of the valve, can quickly react when water hammer occurs, is sensitive in action, can be stably and controllably slowly closed after pressure relief is finished, and is safe and reliable to use.

Description

water hammer relief valve

technical field

The utility model relates to the technical field of valves, in particular to a water hammer relief valve.

Background technique

In order to ensure the safe and stable operation of the pipeline, it is particularly important to set up a suitable water hammer relief system and deal with the accident conditions of the pipeline. The function of the water hammer relief system is to perform pressure relief protection when the pressure reaches or exceeds the pressure relief set value of the relief valve. Therefore, the relief valve is an important device to protect the safety of the pipeline.

Most of the existing water hammer relief valves adopt the pilot-operated structure of the main valve and the pilot valve. The first movement of the pilot valve drives the rear movement of the main valve, so as to realize the opening of the main valve to release water and reduce pressure. However, the above-mentioned water hammer relief valve has the following defects in use: it can only realize the opening of the main valve to release water and reduce pressure when the hydraulic power reaches a certain high pressure, the adjustment and use range is narrow, and the valve closing process is too fast, there is no The buffering process is prone to damage.

Utility model content

In order to solve the problems in the above-mentioned background technology, the utility model provides a water hammer relief valve, which is suitable for low pressure and high pressure working conditions, effectively increases the adjustable range of the valve pressure relief value, and can quickly Response, sensitive action, smooth and controllable slow closing after pressure relief, safe and reliable to use.

In order to achieve the above object, the utility model adopts the following technical solutions:

The utility model provides a water shock relief valve, which includes a main valve, a first pilot valve, a second pilot valve, a needle valve and a ball valve;

A first control pipeline is connected between the water inlet of the main valve and the water inlet of the first pilot valve, and a second control pipeline is connected between the water inlet of the main valve and the water inlet of the second pilot valve. control pipeline, the control chamber of the main valve is respectively connected to the water inlet of the first pilot valve and the water inlet of the second pilot valve through the third control pipeline and the fourth control pipeline, and the first pilot valve The water outlet of the valve is connected with the first drainage pipeline, the water outlet of the second pilot valve is connected with the water outlet of the main valve through the second drainage pipeline, and a ball valve is installed on the second drainage pipeline, so A fifth control pipeline is connected between the water inlet of the main valve and the control chamber of the main valve, and a needle valve is installed on the fifth control pipeline. When in use, the opening pressure of the main valve can be adjusted through the adjusting bolts on the first pilot valve and the second pilot valve.

A further improvement is that a pressure gauge is installed on the fifth control pipeline.

Through the cooperation of the pressure gauge and the needle valve, adjust the needle valve to control the closing speed.

A further improvement is that the main valve includes a valve body, a valve cover, a diaphragm, a drive assembly, a disc, a gasket and a valve seat, a valve cover is provided at the top of the valve body, and the diaphragm is sealed and press-fitted on the Between the valve body and the valve cover, a control chamber is formed between the diaphragm and the valve cover, an internal flow channel is formed between the diaphragm and the valve body, and the valve seat is located in the valve The inside of the body, and a medium passage port is formed in the internal flow channel. The drive assembly is located in the control chamber and connected to the diaphragm. There is a sealing pad at the end, and the bottom end of the sealing pad is in movable and sealing contact with the top of the valve seat to seal or open the medium channel opening.

When working, through the cooperation of the pipeline outside the main valve, the first pilot valve and the second pilot valve are controlled to open, and the pressure in the control room of the main valve is adjusted. When the pressure in the control room of the main valve is greater than the pressure at the water inlet of the main valve , the driving assembly and the diaphragm move downwards, and then drive the disc at the bottom of the diaphragm to move downwards smoothly. Seal the medium channel opening in the main valve, thereby disconnecting the internal flow channel in the main valve, and the main valve is in a closed state; when the pressure in the control room of the main valve is lower than the pressure at the water inlet of the main valve, the driving component and the diaphragm move upward , and then drives the disc at the bottom of the diaphragm to move upwards steadily. When the disc moves upward until the gasket at the bottom is separated from the top of the valve seat, the medium passage port in the main valve can be opened, and the main valve can be opened. The opening of the medium channel is adjusted, so that the internal flow channel in the main valve is opened, and the main valve is in an open state.

A further improvement is that the drive assembly includes a guide sleeve, a valve stem and an elastic member, the top end of the valve stem is slidably arranged in the guide sleeve at the inner top of the valve cover, and the bottom end of the valve stem passes through the membrane The plate and disc are movably connected with the valve seat, the elastic member is located in the control chamber of the main valve, and the elastic member is sleeved on the outside of the valve stem.

Through the cooperation of the guide sleeve, valve stem and elastic parts in the drive assembly, the diaphragm and valve disc can move up and down smoothly, which can buffer and protect the main valve and prolong the service life of the main valve.

A further improvement is that a diaphragm pressure plate is provided at the top end of the diaphragm, and a gasket pressure plate is provided at the bottom end of the gasket.

A further improvement is that the valve body is fixedly connected to the valve cover through a plurality of bolt assemblies.

By setting, it is convenient to assemble the valve body and the valve cover.

Compared with the prior art, the utility model has the following beneficial effects:

The water hammer relief valve in the utility model is provided with a first pilot valve and a second pilot valve, and the two pilot valves are respectively connected with the control pipeline. The water flow is discharged from the first control pipeline, the first pilot valve and the first drainage pipeline, thereby realizing the water discharge and pressure reduction; under high pressure conditions, the second pilot valve is opened, and the water flow in the main valve control chamber is controlled by the third The pipeline and the first pilot valve, the fourth control pipeline and the second pilot valve are quickly discharged, and the first pilot valve and the second pilot valve assist in quickly opening the main valve to quickly release water and reduce pressure; after pressure relief, the first The pilot valve and the second pilot valve are in the closed state, and the water flow at the water inlet of the main valve enters the main valve control chamber through the fifth control pipeline, and the closing speed of the valve is controlled by the needle valve, realizing the stable and controllable slow closing of the main valve ;

The water hammer relief valve is suitable for low pressure and high pressure working conditions, effectively increases the adjustable range of the pressure relief value of the valve, and can react quickly when water hammer occurs, with sensitive action, and can be smoothly and controllably closed slowly after the pressure relief is completed. , It is safe and reliable to use.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Fig. 1 is the structural representation of water hammer relief valve in the utility model;

Wherein, the specific reference signs are: main valve 1, first control pipeline 2, first pilot valve 3, second control pipeline 4, second pilot valve 5, third control pipeline 6, fourth control pipeline 7. Fifth control pipeline 8, pressure gauge 9, needle valve 10, first drainage pipeline 11, second drainage pipeline 12, ball valve 13, valve body 14, valve cover 15, diaphragm 16, diaphragm pressure plate 17. Guide sleeve 18, valve stem 19, elastic member 20, valve seat 21, medium passage port 22, valve disc 23, gasket 24, gasket pressure plate 25, bolt assembly 26.

detailed description

The embodiment of the utility model discloses a water hammer relief valve, as shown in Figure 1, comprising a main valve 1, a first pilot valve 3, a second pilot valve 5, a needle valve 10 and a ball valve 13; the main valve 1 The first control pipeline 2 is connected between the water inlet of the main valve 1 and the water inlet of the first pilot valve 3, and the second control pipeline 4 is connected between the water inlet of the main valve 1 and the water inlet of the second pilot valve 5. The control chamber of the valve 1 is connected to the water inlet of the first pilot valve 3 and the water inlet of the second pilot valve 5 through the third control pipeline 6 and the fourth control pipeline 7 respectively, and the water outlet of the first pilot valve 3 is connected to There is a first drainage pipeline 11, and the water outlet of the second pilot valve 5 is connected to the water outlet of the main valve 1 through the second drainage pipeline 12. A ball valve 13 is installed on the second drainage pipeline 12, and the inlet of the main valve 1 A fifth control pipeline 8 is connected between the water port and the control chamber of the main valve 1 , and a needle valve 10 is installed on the fifth control pipeline 8 . During use, the cracking pressure of the main valve 1 can be adjusted through the adjusting bolts on the first pilot valve 3 and the second pilot valve 5 .

Under normal working conditions, the first pilot valve 3 and the second pilot valve 5 are in a closed state, and the main valve 1 is also in a reliable closed state;

Under low-pressure conditions, the pressure of the water flow is transmitted to the lower part of the inner diaphragm of the main valve 1, and also to the lower parts of the diaphragms of the first pilot valve 3 and the second pilot valve 5. Since the diaphragm sensitivity of the first pilot valve 3 is relatively Strong, at this time, the elastic member in the first pilot valve 3 is compressed and moves upward under the increased upward action, the fluid passage in the first pilot valve 3 is opened, and the water flow at the water inlet of the main valve 1 is controlled by the first control tube. 2, the first pilot valve 3 and the first drainage pipeline 11, so as to achieve a certain degree of drainage and pressure reduction;

Under high-pressure conditions, the pressure of the water flow increases until the elastic member in the second pilot valve 5 is compressed and moves upward under a large upward action, and the fluid channel in the second pilot valve 5 is opened. At the same time, the main The force under the inner diaphragm of valve 1 also increases, which drives the water flow in the control chamber of main valve 1 to be quickly discharged by the third control pipeline 6 and the first pilot valve 3, the fourth control pipeline 7 and the second pilot valve 5, respectively. The first pilot valve 3 and the second pilot valve 5 assist in quickly opening the main valve 1 to quickly release water and reduce pressure;

After the pressure relief is completed, the first pilot valve 3 and the second pilot valve 5 are in the closed state, and the water flow at the water inlet of the main valve 1 enters the control room of the main valve 1 through the fifth control pipeline 8, and is controlled by the needle valve 10. The valve speed realizes the smooth and controllable slow closing of the main valve 1.

Wherein, a pressure gauge 9 is installed on the fifth control pipeline 8 . Through the cooperation of the pressure gauge 9 and the needle valve 10, the needle valve 10 is adjusted to control the closing speed.

Wherein, the main valve 1 includes a valve body 14, a valve cover 15, a diaphragm 16, a driving assembly, a disc 23, a gasket 24 and a valve seat 21, the top of the valve body 14 is provided with a valve cover 15, and the diaphragm 16 is sealed and pressed on Between the valve body 14 and the valve cover 15, a control chamber is formed between the diaphragm 16 and the valve cover 15, and an internal flow channel is formed between the diaphragm 16 and the valve body 14, and the valve seat 21 is located inside the valve body 14, and the internal flow A medium channel opening 22 is formed in the channel, and the drive assembly is located in the control room and connected to the diaphragm 16. The bottom end of the diaphragm 16 is provided with a valve disc 23, and the bottom end of the valve disc 23 is provided with a gasket 24, and the bottom end of the gasket 24 is connected to the valve. The top of the seat 21 is in movable sealing contact to seal or open the medium channel opening 22 . When working, the pressure in the control room of the main valve 1 is adjusted through the cooperation of the external pipeline of the main valve 1. When the pressure in the control room of the main valve 1 is greater than the pressure at the water inlet of the main valve 1, the drive assembly and the diaphragm 16 are downward As a result, the disc 23 located at the bottom of the diaphragm 16 moves downward steadily. When the disc 23 moves down until the gasket 24 at the bottom contacts with the top of the valve seat 21 to form a sealing surface, the main valve 1 The medium channel port 22 in the main valve 1 is sealed, so that the internal flow channel in the main valve 1 is disconnected, and the main valve 1 is in a closed state; 16 moves upward, and then drives the disc 23 at the bottom of the diaphragm 16 to move upward steadily. When the disc 23 moves upward to the point where the gasket 24 at the bottom is separated from the top of the valve seat 21, the medium channel in the main valve 1 can be closed. The port 22 is opened, and the opening degree of the medium channel in the main valve 1 can be adjusted, thereby opening the internal flow channel in the main valve 1, and the main valve 1 is in an open state.

Wherein, the driving assembly includes a guide sleeve 18, a valve stem 19 and an elastic member 20. The top end of the valve stem 19 is slidably arranged in the guide sleeve 18 at the inner top of the valve cover 15, and the bottom end of the valve stem 19 passes through the diaphragm 16 and the valve disc 23. , and is movably connected with the valve seat 21 , the elastic member 20 is located in the control chamber of the main valve 1 , and the elastic member 20 is sleeved on the outside of the valve stem 19 . Through the cooperation of the guide sleeve 18, the valve stem 19 and the elastic member 20 in the driving assembly, the diaphragm 16 and the valve flap 23 can move up and down smoothly, which can buffer and protect the main valve 1 and prolong the service life of the main valve 1 .

Wherein, the top end of the diaphragm 16 is provided with a diaphragm pressing plate 17 , and the bottom end of the sealing pad 24 is provided with a sealing pad pressing plate 25 .

Wherein, the valve body 14 is fixedly connected to the valve cover 15 through a plurality of bolt assemblies 26 . By setting, it is convenient to assemble the valve body 14 and the valve cover 15 .

In summary, the water hammer relief valve can be applied to low-pressure and high-pressure working conditions, effectively increase the adjustable range of the valve pressure relief value, and can react quickly when water hammer occurs, with sensitive action, and can be stable and controllable after the pressure relief is completed. The slow closing is safe and reliable.

The above uses specific examples to illustrate the utility model, which is only used to help understand the utility model, and is not intended to limit the utility model. For those skilled in the technical field to which the utility model belongs, some simple deduction, deformation or replacement can also be made according to the idea of the utility model.

Claims (6)

1. A water hammer relief valve is characterized in that it comprises a main valve, a first pilot valve, a second pilot valve, a needle valve and a ball valve; A first control pipeline is connected between the water inlet of the main valve and the water inlet of the first pilot valve, and a second control pipeline is connected between the water inlet of the main valve and the water inlet of the second pilot valve. control pipeline, the control chamber of the main valve is respectively connected to the water inlet of the first pilot valve and the water inlet of the second pilot valve through the third control pipeline and the fourth control pipeline, and the first pilot valve The water outlet of the valve is connected with the first drainage pipeline, the water outlet of the second pilot valve is connected with the water outlet of the main valve through the second drainage pipeline, and a ball valve is installed on the second drainage pipeline, so A fifth control pipeline is connected between the water inlet of the main valve and the control chamber of the main valve, and a needle valve is installed on the fifth control pipeline. 2. The water hammer relief valve according to claim 1, wherein a pressure gauge is installed on the fifth control pipeline. 3. The water hammer relief valve according to claim 1, wherein the main valve comprises a valve body, a valve cover, a diaphragm, a drive assembly, a disc, a gasket and a valve seat, and the top end of the valve body A valve cover is provided, the diaphragm is sealed and pressed between the valve body and the valve cover, a control chamber is formed between the diaphragm and the valve cover, and the gap between the diaphragm and the valve body is An internal channel is formed between them, the valve seat is located inside the valve body, and a medium passage port is formed in the internal channel, the driving assembly is located in the control chamber and connected with the diaphragm, the A valve disc is provided at the bottom of the diaphragm, and a sealing pad is provided at the bottom of the valve disc, and the bottom of the sealing pad is in movable and sealing contact with the top of the valve seat to seal or open the medium channel opening. 4. The water hammer relief valve according to claim 3, wherein the driving assembly includes a guide sleeve, a valve stem and an elastic member, and the top end of the valve stem is slidably arranged on a guide at the inner top of the valve cover. In the sleeve, the bottom end of the valve rod passes through the diaphragm and the disc, and is movably connected with the valve seat. The elastic member is located in the control chamber of the main valve, and the elastic member is sleeved in the outside of the valve stem. 5. The water hammer relief valve according to claim 3 or 4, characterized in that a diaphragm pressure plate is provided at the top of the diaphragm, and a gasket pressure plate is provided at the bottom end of the gasket. 6. The water hammer relief valve according to claim 5, wherein the valve body and the valve cover are fixedly connected by a plurality of bolt assemblies.

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