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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Swing check valve

The disc of the swing check valve is disc-shaped and rotates around the shaft of the valve seat passage. Because the passage in the valve is streamlined, the flow resistance is smaller than that of the lift check valve. It is suitable for low flow rates and non-return valves. Large diameter occasions with frequent changes, but not suitable for pulsating flow, and its sealing performance is not as good as the lifting type.

Swing check valve category

Swing check valves are divided into three types, single-leaf type, double-leaf type and multi-half type. These three types are mainly classified according to the valve diameter. The purpose is to prevent the medium from stopping or flowing backwards and weaken the hydraulic shock.

Swing check valve structure

The swing check valve is composed of a valve body, a valve cover, a valve clack and a rocker. The valve clack is in the shape of a disc and rotates around the pin shaft outside the valve seat channel. The channel in the valve is streamlined, and the flow resistance is smaller than the straight-through lift check valve, which is suitable for large-diameter pipelines.

Swing check valve applicable occasions

The swing check valve can be made into a higher working pressure, <PN420, the nominal size can be larger, and it can be DN2000 or above. According to the different materials of the shell and the sealing parts, it can be applied to most working media and most working temperature ranges. The medium is water, steam, gas, corrosive medium, oil, food, etc. The working temperature of the medium is in the range of -196~800℃, and the specific working temperature needs to be confirmed according to the material of the valve body and the internal sealing material.

Frequently Asked Question

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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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