WO2018040704A1 - One-way valve adapted to highly corrosive environment - Google Patents

Abstract

A one-way valve adapted to a highly corrosive environment, comprising: an inlet valve body (1), an outlet valve body (2), and a valve seat (3), wherein the inlet valve body (1) is connected with the outlet valve body (2), the valve seat (3) is provided between the connection points of the inlet valve body (1) and outlet valve body (2), and is connected with a valve head (4) disposed in the valve body (2), and the valve head (4) is formed of a PTFE material. The contact surface of the valve head (4) and the valve seat (3) is a sealing surface (5) having the shape of a blade. In the outlet valve body (2), a spring A (6) is provided between the valve head (4) and the outlet valve body (2), with an end of the spring A being secured at an opening of the flow channel of the outlet valve body (2). In the valve head (4), a spring B (7) is further provided between the sealing surface (5) and the spring A (6). A layer of low temperature anticorrosive coating is further provided on the surfaces of the valve head (4) and the valve seat (3). The one-way valve addresses the issues of short service life of a valve in a low temperature corrosive environment, and the extremely high sealing pressure required for achieving a good sealing effect.

Description

One-way valve for highly corrosive media Technical field

This invention relates to the field of valves, and more particularly to a one-way valve suitable for use in highly corrosive media.

Background technique

The valve is a control component in the pipeline fluid delivery system, which is used to change the passage section and the flow direction of the medium, and has the functions of diversion, cutoff, throttling, check, split or overflow relief. The valve for fluid control can be used to control various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can be from 0.0013MPa to 1000MPa. The ultra-high pressure, the working temperature can be from c-270 ° C ultra-low temperature to 1430 ° C high temperature. Valve control can be used in a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, turbo, electromagnetic, electromagnetic hydraulic, electrohydraulic, gas-hydraulic, spur gear, bevel gear drive, etc.; can be under pressure, temperature Under the action of other forms of sensing signals, according to predetermined requirements, or simply open or close without relying on the sensing signal, the valve relies on a drive or an automatic mechanism to cause the opening and closing member to be lifted, slid, swung or swung. Movement, thereby changing the size of its flow path area to achieve its control function.

The main function of the check valve is to protect the upstream system when the system pressure is abnormal; set a pressure value to the valve artificially, when the upstream pressure is greater than the set value, the valve opens, the medium flows from the upstream to the downstream; when the downstream occurs abnormally In order to protect the upstream system, the check valve is closed to ensure the safety of the upstream system; in the prior art, the valve generally uses rubber as the sealing material, although the rubber has good elasticity and low hardness, in order to obtain a good seal only A small seal pressure is required, but rubber cannot be used in an ultra-low temperature working environment.

Summary of the invention

The object of the present invention is to provide a one-way valve suitable for a highly corrosive medium, which solves the problem that the valve has a short service life in a low temperature and corrosive environment, and a large sealing ratio is required for obtaining a good sealing effect. .

The invention is achieved by the following technical solutions:

A one-way valve suitable for a highly corrosive medium, comprising an inlet valve body, an outlet valve body, a valve seat, an inlet valve body connected to the outlet valve body, and a valve disposed between the connection point of the inlet valve body and the outlet valve body Seat, the valve seat is connected with the valve head located in the outlet valve body, the valve head is made of PTFE material; the contact surface of the valve head and the valve seat is a sealing surface, the sealing surface is set to a blade shape; and the sealing valve body is further disposed inside the outlet valve body There is a spring A, the spring A is located between the valve head and the outlet valve body, one end of the spring A is fixed at the flow passage opening of the outlet valve body; a spring B is further disposed inside the valve head, and the spring B is located between the sealing surface and the spring A A layer of low temperature anti-corrosion coating is also provided on the valve head and seat surface.

Further, the conventional one-way valve generally uses rubber as a sealing material, although the rubber sealing material has a good bomb. Sex, low hardness, it is only necessary to obtain a good seal and only need a small sealing pressure, but rubber can not be used in a low temperature working environment of -196 °C. The invention is mainly a one-way stop valve, and a valve seat is arranged between the connection point of the inlet valve body and the outlet valve body, and the valve seat is connected with the valve head located in the outlet valve body. In order to be able to transport low temperature and highly corrosive media, the valve head is made of PTFE material as the sealing material. PTFE is a good low temperature sealing material that can be used in the working environment as low as -196 °C for a long time. However, PTFE or PCTFE has a higher hardness than rubber. PTFE as a sealing element, in the process of contact with the medium, has the influence of water absorption, linear expansion coefficient, etc., resulting in microscopic unevenness of the sealing surface. Moreover, PTFE as a sealing element, due to the unevenness of the instantaneous force under the scouring of the medium, causes the sealing element to jump, resulting in poor contact of the sealing surface and poor sealing performance. Therefore, PTFE as a sealing element determines that it requires a relatively large sealing specific pressure to obtain a good seal. In order to solve the problem that a large sealing specific pressure is required to obtain a good sealing performance, the contact surface of the valve head and the valve seat is set to a blade shape. The use of a blade-shaped sealing surface reduces the sealing area, so that a large sealing force can be obtained with a small applied force, which can obtain a good and stable sealing effect and also reduce the opening pressure of the valve. A spring A is arranged between the valve head and the outlet valve body. When the system pressure is abnormal, the low temperature and high corrosive medium impacts the valve head. When the valve head is opened, the valve head contacts the spring A, compresses the spring, and the spring A generates a The reverse force can effectively reduce the impact force of the low temperature medium conveying, thereby protecting the outlet valve body and protecting the sealing between the outlet valve body and the inlet valve body, so that the valve is not easy to generate a gap, resulting in a low temperature and high corrosive medium. leakage. The valve head and the valve body are the most easily damaged parts of the check valve. A spring B is arranged inside the valve head to reduce the impact of the low temperature and high corrosive medium on the valve head and protect the valve head. Applying a layer of low-temperature anti-corrosion coating on the valve head and seat surface effectively protects the blade-type sealing surface and seat on the valve head, so that the sealing surface and the valve seat are not corroded, thus extending the valve head and valve The service life of the seat can achieve the effect of prolonging the life of the valve, saving economic costs.

Both the spring A and the spring B employ a butterfly spring. The butterfly spring has the advantages of short stroke, heavy load, small required space, convenient combination, easy maintenance and replacement, economy, safety, and long service life.

A sawtooth pattern is arranged on the inner wall of the inlet valve, and a zigzag pattern is arranged on the outer wall of the outlet valve body, and the inlet valve body and the outlet valve body are matched and connected according to the same. Through the connection method, the connection between the inlet valve body and the outlet valve body is tighter, the sealing performance is stronger, and the leakage problem is greatly reduced.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. A one-way valve suitable for a highly corrosive medium according to the present invention, wherein the valve head is made of a PTFE material as a sealing material. PTFE is a good low temperature sealing material. It can be used in the working environment as low as -196 °C for a long time. It replaces the rubber sealing material and is good for conveying low temperature and high corrosive medium. The contact surface between the valve head and the valve seat is set as the edge. The shape of the shape reduces the sealing area, so a large sealing force can be obtained with a small applied force, which can obtain a good and stable sealing effect, and also reduce the opening pressure value of the valve; In a corrosive environment, the valve is good. Good sealing effect, the problem of required sealing is too large;

2. The one-way valve suitable for high corrosive medium has a low-temperature anti-corrosion coating on the valve head and the valve seat surface, effectively protecting the blade-type sealing surface and the valve seat on the valve head, so as to seal The surface and the valve seat are not corroded, thereby prolonging the service life of the valve head and the valve seat, thereby extending the life of the valve and saving economic cost;

3. A one-way valve suitable for a highly corrosive medium, a spring A is arranged between the valve head and the outlet valve body, and a spring B is arranged inside the valve head, thereby effectively reducing the low temperature and high corrosive medium to the valve. The impact of the head protects the valve head and the valve body.

DRAWINGS

The drawings are intended to provide a further understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the invention. In the drawing:

Figure 1 is a schematic view of the structure of the present invention.

The markings in the drawing and the corresponding part names:

1-inlet valve body, 2-outlet valve body, 3-valve seat, 4-valve head, 5-sealing surface, 6-spring A, 7-spring B, 8-flow port.

detailed description

The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. As a limitation of the invention.

Example 1:

A check valve suitable for a highly corrosive medium as shown in FIG. 1 includes an inlet valve body 1, an outlet valve body 2, a valve seat 3, and an inlet valve body 1 connected to the outlet valve body 1, which is characterized in that A valve seat 3 is disposed between the connection point of the inlet valve body 1 and the outlet valve body 2. The valve seat 3 is connected to the valve head 4 located in the outlet valve body 2, and the valve head 4 is made of PTFE material; the valve head 4 is The contact surface of the valve seat 3 is a sealing surface 5, and the sealing surface 5 is provided in a blade shape; a spring A6 is further disposed inside the outlet valve body 2, and the spring A6 is located between the valve head 4 and the outlet valve body 2, and one end of the spring A6 It is fixed at the flow port 8 of the outlet valve body 2; a spring B7 is disposed inside the valve head 4, the spring B7 is located between the sealing surface 5 and the spring A6; and a layer of low temperature anticorrosion is further disposed on the surface of the valve head 4 and the valve seat 3 coating. Both the spring A6 and the spring B7 employ a butterfly spring. A serration is provided on the inner wall of the inlet valve body 1, and a serration is provided on the outer wall of the outlet valve body 2, and the inlet valve body 1 and the outlet valve body 2 are connected by the matching.

In order to be able to transport low temperature and highly corrosive media, the valve head 4 is made of a PTFE material that can be used in a working environment as low as -196 ° C for a long time. The PTFE used has a high hardness and requires a large sealing pressure to obtain Good sealing performance, the contact surface of the valve head 4 and the valve seat 3 is set to a blade shape to reduce the sealing area, and a small pressure is applied to the sealing surface 5 to obtain a large sealing specific pressure, and also Reduce the opening pressure of the valve. A spring A6 is arranged between the valve head 4 and the outlet valve body 2, which effectively reduces the impact force of the low temperature and high corrosive medium, thereby protecting the outlet valve body 2, and protecting the outlet valve body 2 and the inlet valve body 1 The tightness between the seals makes the valve less prone to gaps and causes media leakage. The spring B7 is disposed inside the valve head 4 to reduce the impact of the low temperature and high corrosive medium on the valve head 4, and protect the valve head 4. Applying a layer of low-temperature anti-corrosion coating on the surface of the valve head 4 and the valve seat 3 effectively protects the blade-shaped sealing surface 5 and the valve seat 3 on the valve head 4, so that the sealing surface 5 and the valve seat 3 are not corroded.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (3)

A check valve suitable for a highly corrosive medium, comprising an inlet valve body (1), an outlet valve body (2), a valve seat (3), and an inlet valve body (1) connected to the outlet valve body (1), The utility model is characterized in that a valve seat (3) is arranged between the connection point of the inlet valve body (1) and the outlet valve body (2), the valve seat (3) and the valve head (4) located in the outlet valve body (2) Connected, the valve head (4) is made of PTFE material; the contact surface of the valve head (4) and the valve seat (3) is a sealing surface (5), the sealing surface (5) is set to a blade shape; at the outlet valve body (2) A spring A (6) is also arranged inside, a spring A (6) is located between the valve head (4) and the outlet valve body (2), and one end of the spring A (6) is fixed to the outlet valve body (2) At the runner port (8); a spring B (7) is also arranged inside the valve head (4), the spring B (7) is located between the sealing surface (5) and the spring A (6); at the valve head (4) and The surface of the valve seat (3) is also provided with a layer of low temperature anticorrosive coating. A check valve suitable for a highly corrosive medium according to claim 1, wherein both the spring A (6) and the spring B (7) employ a butterfly spring. A check valve suitable for a highly corrosive medium according to claim 1, characterized in that a zigzag pattern is provided on the inner wall of the inlet valve body (1), and a serration is provided on the outer wall of the outlet valve body (2). The pattern, the inlet valve body (1) and the outlet valve body (2) are connected by the matching.

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