CN217056542U

CN217056542U - Pressure reducing valve

Info

Publication number: CN217056542U
Application number: CN202123386991.6U
Authority: CN
Inventors: 张军亚
Original assignee: Shanghai Woyuan Automatic Control Valve Co ltd
Current assignee: Shanghai Woyuan Automatic Control Valve Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-26
Anticipated expiration: 2031-12-30

Abstract

The utility model provides a pressure reducing valve, which comprises an upper cover and a lower valve body fixedly connected with the upper cover; the top end of the upper cover is provided with a handle, the top end of the handle is fixedly connected with a spring seat arranged in the upper cover, the bottom end of the spring seat is fixedly connected with a first spring, the bottom end of the first spring is fixedly connected with a piston, a secondary valve seat is fixed at the bottom end of the piston, a secondary valve port is arranged on the secondary valve seat and communicated with an exhaust port arranged at one side of the upper cover, the top end of the lower valve body is provided with a main valve seat, a valve core is arranged in the main valve port, the valve core is provided with a first ejector block and a second ejector block, the first ejector block is in contact connection with the secondary valve seat, the second ejector block is in contact connection with the main valve seat, a structure with the functions of an adjusting spring and air pressure is adopted, when the outlet pressure of the pressure reducing valve is abnormal or is larger than the spring force, the first ejector block in the middle of the piston is separated from the secondary valve seat, so that media are discharged from the secondary valve port, and the rise of the outlet pressure is limited.

Description

Pressure reducing valve

Technical Field

The utility model relates to the technical field of valves, specifically a relief pressure valve.

Background

With the development of industry, back pressure valves are used in gas-liquid pipelines of electronics, semiconductor petrochemical industry, biopharmaceuticals, laboratories, universities and the like, can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like, and mainly play a role in stabilizing pressure on pipelines, and commonly used systems include a reaction kettle, a fluid metering and dosing system, a hydraulic control system, chemical reaction conditions, critical state control of physical states and the like.

The conventional pressure reducing valve has a limited outlet pressure adjusting mode, has no relay function and deviation correcting function, is mainly adjusted by a spring, and cannot realize relay adjustment and deviation correction of pressure in different scenes.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems in the background art, the present invention provides a pressure reducing valve.

In order to achieve the above purpose, the utility model provides a following technical scheme: a pressure reducing valve comprises an upper cover and a lower valve body fixedly connected with the upper cover; the top end of the upper cover is provided with a handle, the top end of the handle is fixedly connected with a spring seat arranged in the upper cover, the bottom end of the spring seat is fixedly connected with a first spring, the bottom end of the first spring is fixedly connected with a piston, the bottom end of the piston is fixedly provided with a secondary valve seat, the secondary valve seat is provided with a secondary valve port, the secondary valve port is communicated with an exhaust port arranged on one side of the upper cover, a first pressure cavity is formed between the lower valve body and the piston, the top end of the lower valve body is provided with a main valve seat, the main valve seat is provided with a main valve port, a valve core is arranged in the main valve port, the valve core is provided with a first top block and a second top block, the first top block is in contact connection with the secondary valve seat, the second top block is in contact connection with the main valve seat, and the bottom end of the second top block is fixedly provided with a second spring; one side of the lower valve body is provided with an air inlet, the other side of the lower valve body is provided with an air outlet, and the air outlet is communicated with the first pressure cavity; a second pressure cavity is formed between the upper cover and the piston, and a pneumatic control port is arranged on the other side of the upper cover and communicated with the second pressure cavity.

Preferably, a 0-shaped ring is arranged between the piston and the upper cover.

Preferably, the handle is connected with the upper cover through a fixing nut, and a sealing gasket is arranged between the upper cover and the fixing nut.

Preferably, the secondary valve port is communicated with an exhaust port arranged on one side of the upper cover through an exhaust pipeline.

Preferably, the first top block is matched with the secondary valve port in shape, when the first top block is contacted with the secondary valve seat, the secondary valve port is closed, and when the first top block is separated from the secondary valve seat, the secondary valve port is opened; the shape of the second ejector block is matched with that of the main valve port, when the second ejector block is in contact with the main valve seat, the main valve port is closed, and when the second ejector block is separated from the main valve seat, the main valve port is opened.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model provides a pressure reducing valve, which solves the technical problems of the prior pressure reducing valve that the outlet pressure adjusting mode is single and the accurate adjustment cannot be satisfied, the utility model adopts the structure of adjusting the action of the spring and the air pressure, when the outlet pressure of the pressure reducing valve is abnormal or the outlet pressure is larger than the spring force, the first top block in the middle of the piston is separated from the secondary valve seat, so that the medium is discharged from the secondary valve port, thereby limiting the rise of the outlet pressure; meanwhile, the pressure can be adjusted by a handle to perform manual deviation correction and relay.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1, the utility model provides a pressure reducing valve, which comprises an upper cover 1 and a lower valve body 2 fixedly connected with the upper cover 1; the top end of the upper cover 1 is provided with a handle 3, the top end of the handle 3 is fixedly connected with a spring seat 4 arranged in the upper cover 1, the bottom end of the spring seat 4 is fixedly connected with a first spring 5, the bottom end of the first spring 5 is fixedly connected with a piston 6, a secondary valve seat 7 is fixed at the bottom end of the piston 6, a secondary valve port 8 is arranged on the secondary valve seat 7, the secondary valve port 8 is communicated with an exhaust port 9 arranged at one side of the upper cover 1, a first pressure chamber 10 is formed between the lower valve body 2 and the piston 6, a main valve seat 11 is arranged at the top end of the lower valve body 2, a main valve port 12 is arranged on the main valve seat 11, a valve core 13 is arranged in the main valve port 12, a first ejector block 14 and a second ejector block 15 are arranged on the valve core 13, the first ejector block 14 is in contact connection with the secondary valve seat 8, the second ejector block 15 is in contact connection with the main valve seat 11, and a second spring 16 is fixed at the bottom end of the second ejector block 15; one side of the lower valve body 2 is provided with an air inlet 17, the other side of the lower valve body 2 is provided with an air outlet 18, and the air outlet 18 is communicated with the first pressure cavity 10.

A second pressure cavity 19 is formed between the upper cover 1 and the piston 6, an air control port 20 is arranged on the other side of the upper cover 1, and the air control port 20 is communicated with the second pressure cavity 19.

The shape of the first top block 14 is matched with that of the secondary valve port 8, when the first top block 14 is contacted with the secondary valve seat 7, the secondary valve port 8 is closed, and when the first top block 14 is separated from the secondary valve seat 7, the secondary valve port 8 is opened; the second ejector block 15 is matched with the main valve port 12 in shape, when the second ejector block 15 is contacted with the main valve seat 11, the main valve port 12 is closed, and when the second ejector block 15 is separated from the main valve seat 11, the main valve port 12 is opened; normally, the pressures of the first pressure chamber 10 and the second pressure chamber 19 are balanced, when the first ejector block 14 contacts with the secondary valve seat 7, the secondary valve port 8 is closed, the second ejector block 15 contacts with the main valve seat 11, the main valve port 12 is closed, gas is introduced from the gas control port 20, the pressure in the second pressure chamber 19 is greater than the pressure in the first pressure chamber 10, the piston 6 moves downwards, the second ejector block 15 is separated from the main valve seat 11, the main valve port 12 is opened, and the gas flows to the gas outlet 18 through the main valve port 12.

It should be noted that when the pressure at the outlet 18 of the pressure reducing valve is abnormal or the pressure at the outlet 18 is greater than the pressure of the first spring 5, the gas is introduced into the first pressure chamber 10 from the outlet 18, the pressure in the first pressure chamber 10 is greater than the pressure in the second pressure chamber 19, the piston 6 moves upward, at this time, the secondary valve seat 7 is separated from the first top block 14, the secondary valve port 8 is opened, and the medium is discharged through the secondary valve port 8, the exhaust pipe 24 and the exhaust port 9, thereby limiting the increase of the pressure at the outlet 18.

Specifically, a 0-ring 21 is provided between the piston 6 and the upper cover 1, so as to ensure the sealing of the first pressure chamber 10 and the second pressure chamber 19 with each other, thereby ensuring the accuracy of pressure adjustment.

The handle 3 is connected with the upper cover 1 through the fixing nut 22, the sealing gasket 23 is arranged between the upper cover 1 and the fixing nut 22, and the sealing performance in the upper cover 1 is guaranteed by the sealing gasket 23. The secondary valve port 8 is communicated with an exhaust port 9 arranged at one side of the upper cover 1 through an exhaust pipe 24, and a medium of the secondary valve port 8 is discharged into the exhaust port 9 through the exhaust pipe 24.

In a normal state, when the handle 3 is reversely rotated, the elastic force of the first spring 5 is reduced, the piston 6 moves upwards, the manual auxiliary secondary valve seat 7 is separated from the first ejector block 14, the secondary valve port 8 is opened, the pressure reduction action is repeated, and the pressure of the outlet 18 can be manually adjusted.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A pressure reducing valve, characterized by: comprises an upper cover (1) and a lower valve body (2) fixedly connected with the upper cover (1);

the top end of the upper cover (1) is provided with a handle (3), the top end of the handle (3) is fixedly connected with a spring seat (4) arranged in the upper cover (1), the bottom end of the spring seat (4) is fixedly connected with a first spring (5), the bottom end of the first spring (5) is fixedly connected with a piston (6), the bottom end of the piston (6) is fixedly provided with a secondary valve seat (7), the secondary valve seat (7) is provided with a secondary valve port (8), the secondary valve port (8) is communicated with an exhaust port (9) arranged on one side of the upper cover (1), a first pressure cavity (10) is formed between the lower valve body (2) and the piston (6), the top end of the lower valve body (2) is provided with a main valve seat (11), the main valve seat (11) is provided with a main valve port (12), a main valve core (13) is arranged in the main valve port (12), and a first top block (14) and a second top block (15) are arranged on the main valve core (13), the first ejector block (14) is in contact connection with the secondary valve seat (7), the second ejector block (15) is in contact connection with the primary valve seat (11), and a second spring (16) is fixed at the bottom end of the second ejector block (15);

an air inlet (17) is formed in one side of the lower valve body (2), an air outlet (18) is formed in the other side of the lower valve body (2), and the air outlet (18) is communicated with the first pressure cavity (10);

a second pressure cavity (19) is formed between the upper cover (1) and the piston (6), a pneumatic control port (20) is arranged on the other side of the upper cover (1), and the pneumatic control port (20) is communicated with the second pressure cavity (19).

2. A pressure reducing valve according to claim 1, wherein: and a 0-shaped ring (21) is arranged between the piston (6) and the upper cover (1).

3. A pressure reducing valve according to claim 2, wherein: the handle (3) is connected with the upper cover (1) through a fixing nut (22), and a sealing gasket (23) is arranged between the upper cover (1) and the fixing nut (22).

4. A pressure reducing valve according to claim 3, wherein: the secondary valve port (8) is communicated with an exhaust port (9) arranged on one side of the upper cover (1) through an exhaust pipe (24).

5. The pressure reducing valve according to claim 4, wherein: the shape of the first top block (14) is matched with that of the secondary valve port (8), when the first top block (14) is contacted with the secondary valve seat (7), the secondary valve port (8) is closed, and when the first top block (14) is separated from the secondary valve seat (7), the secondary valve port (8) is opened;

the shape of the second ejector block (15) is matched with that of the main valve port (12), when the second ejector block (15) is in contact with the main valve seat (11), the main valve port (12) is closed, and when the second ejector block (15) is separated from the main valve seat (11), the main valve port (12) is opened.