What is a swing check valve

What is a swing check valve

Swing check valve is also called one-way valve or check valve, its function is to prevent the medium in the pipeline from flowing back. The valve whose opening and closing parts are opened or closed by the flow and force of the medium to prevent the medium from flowing back is called a check valve. Check valves belong to the category of automatic valves, which are mainly used in pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents. This type of valve should generally be installed horizontally in the pipeline.

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Structural features of swing check valve

The swing check valve adopts a built-in rocker swing structure. All the opening and closing parts of the valve are installed inside the valve body and do not penetrate the valve body. Except for the sealing gasket and sealing ring at the middle flange, the whole There is no leakage point, preventing the possibility of valve leakage. The swing arm of the swing check valve adopts a spherical connection structure at the connection between the rocker arm and the valve clack, so that the valve clack has a certain degree of freedom within the range of 360 degrees, and there is an appropriate trace position compensation. Swing check valves have been widely used in many fields such as chemical industry, metallurgy, and pharmaceuticals.

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The valve that opens or closes by the force of the flow of the medium to prevent the backflow of the medium is called the non-return valve source. Check valves belong to the category of automatic valves, which are mainly used in pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents. According to the structure, it can be divided into three types: lift check valve, swing check valve and butterfly check valve.

Attention points for installation and use of swing check valve 1. The steam extraction check valve is installed vertically on the horizontal pipeline and is generally in a fully open state. 2. The following work should be done before installation 1) Remove the stuffy cover and foam plate at both ends of the valve channel, clean the inner cavity, and remove the grease; 2) Peel off the grease paper on the surface of the valve disc to remove the grease on the surface of the valve disc; 3. The flow of media must be restricted during installation. 4. The medium passing through the pipeline should not contain hard particles, so as not to damage the sealing surface 5. The valve is inspected and tested one by one before leaving the factory, and the installation unit can directly pressure test or install it.

1. The valve should be stored in a dry and ventilated room to prevent moisture, rain and rust. 2. The opening and closing parts should be in the closing device during storage for monthly transportation, and the following work should be done at the same time: 1) The disc should be fixed in the open position 2) The inner ports at both ends of the diameter are blocked with foam plates, and the ports must be plugged tightly with stuffed caps to prevent dust and rust, keep the channels clean and the end faces flat; 3) Proper packaging protection, anti-vibration and anti-collision for the cylinder part; 4) The valve should be placed steadily, with the pneumatic drive device facing upwards, and should not be squeezed by each other. 3. It should be checked regularly when placed for a long time. Every three months, check the protection status of the dirt and rust on the two channels, the sealing surface, and the welding joint. After wiping the dirt and rust, repaint the anti-rust oil for protection. 8. The overall structure, simple and compact, beautiful appearance 9. Long service life and high reliability

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