Principle of check valve type of check valve

2022-07-22
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Check valve, also known as one-way valve or check valve, is used to prevent the backflow of medium in the pipeline. The bottom valve of water pump suction is also a check valve. The valve that the opening and closing parts open or close by the medium flow and force to prevent the medium from backflow is called a check valve. It is an automatic valve, which is mainly used on the pipeline with one-way flow of medium. The medium is only allowed to flow in one direction to prevent accidents

check valve, also known as one-way valve or check valve, is used to prevent the backflow of medium in the pipeline. The bottom valve of water pump suction is also a check valve. The valve that the opening and closing parts open or close by the medium flow and force to prevent the medium from backflow is called a check valve. It is an automatic valve, which is mainly used on the pipeline with one-way flow of medium. The medium is only allowed to flow in one direction to prevent accidents. Next, I will introduce the principle and types of check valves

principle of check valve

check valve is an automatic valve. Its main function is to prevent medium backflow, reverse rotation of pump and drive motor, and discharge of container medium. The check valve can also be used to supply the auxiliary system whose pressure may rise above the system pressure. Check valves are mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis)

the function of this type of valve is to allow the medium to flow in one direction only, and to prevent the flow in the opposite direction. Usually, this valve works automatically. Under the pressure of fluid flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self weight of the valve disc act on the valve seat to cut off the flow

among them, check valve belongs to this type of valve, which includes swing check valve and lift check valve. Swing check valve has a hinge mechanism, and a valve disc like a door freely rests on the inclined valve seat surface. In order to ensure that the valve clack can reach the appropriate position of the valve seat surface every time, the valve clack is designed in the hinge mechanism, so that the valve clack has enough swing space and makes the valve clack truly and comprehensively contact the valve seat. The valve disc can be made of metal, or inlaid with leather, rubber or synthetic coverage, depending on the requirements of service performance. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small

type of check valve

1. Butterfly double disc check valve is mainly used in water supply pipelines of high-rise buildings and fluid pipe networks containing corrosive media and sewage

2. The lift silent check valve is used in pipelines with high quality requirements for water supply and drainage projects; At the same time, it can be installed at the outlet of the pump and requires a relatively high pressure (PN2.5MPa) pipe network; It is a good product of waterproof hammer check valve

3. The lift type silencing check valve is applicable to the water supply and drainage system of high-rise buildings and the outlet of pumps, and is not suitable for sewage pipelines

4. The horizontal check valve is suitable for submersible, drainage and sewage pumps, especially for sewage and sludge systems

5. Swing rubber check valve is applied in urban water pipe network system; It is not suitable for sewage pipelines with much sediment

6. The swing single disc check valve has a wide range of applications and can be installed on water supply and drainage, petroleum, chemical, metallurgical, industrial and other pipelines. It is most suitable for occasions with limited space

principle and structural characteristics of spherical check valve

1. The structural length is short, and its structural length is only 1/4~1/8 of the traditional flange check valve

2. It is small, light, and its weight is only 1/4~1/20 of the traditional micro resistance slow closing check valve

3. The valve disc closes quickly, and the water hammer pressure is small

4. Horizontal or vertical pipes can be used, and the installation is convenient

5. The flow path is smooth, and the fluid resistance is small

6. It is sensitive Good sealing performance

7, short valve clack stroke, small closing impact

8, overall structure, simple and compact, beautiful appearance

9, long service life, high reliability

editor's summary: This is the introduction of the principle and types of check valves, hoping to help you. If you want to know more, you can pay attention to information

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