Working principle of swing check valves

A swing check valve, also known as a one-way valve or check valve, is used to prevent the medium in the pipeline from flowing back. The valve that the opening and closing parts automatically open or close by media flow and force to prevent media backflow is called a check valve. The check valve belongs to the automatic valve category, which is mainly used in the pipeline with a one-way flow of the medium. Only one direction of medium flow is allowed to prevent accidents. This type of valve shall generally be installed horizontally in the pipeline.

Here is the content list:

●Purpose of swing check valves

●Structural features of swing check valves

Working principle of swing check valve

The swing check valve, like the lift check valve, is used in the transportation control of the pipeline system. However, lift check valves can only be used in horizontal pipelines, while swing check valves can be installed in water.

It can also be installed in vertical pipes. However, the working principle of the swing check valve is the same as that of the lift check valve, both of which are the pressure generated by medium flow and the pressure of the valve disc itself.

Usually, the inlet direction of the internal medium flow can impact the valve disc to rotate to the other side.

The swing check valve is mainly composed of four parts: valve body, valve cover, valve disc, and rocker. In addition, there is an auxiliary spring and weight structure to improve the tightness of the pipeline. This is because under low pressure, the swing check valve. The tightness of the type check valve is not enough. The metal seat of the swing check valve is often easy to wear, and the internal pressure of the pipe of the swing check valve will exceed the pressure reduction range of the disc check valve. Therefore, a damping knot is set on the valve disc inside the check valve.

When the medium in the pipeline flows, it is necessary to overcome the sudden closing of the valve disc caused by the rise and fall of the check valve, causing water hammer in the pipeline and causing wear on the valve seat.

The swing check valve controls the swing flow in the pipeline through the internal valve disc and rocker shaft. The channel in the valve is streamlined, so it can produce stronger flow resistance. Because of the gravity of the valve disc. The swing check valve will open and produce resistance to the flowing medium.

When the swing check valve is installed in a vertical pipe, the internal medium in the pipe flows from the bottom to the top. If an emergency stop occurs, the internal valve will also interact with the internal medium due to its own gravity.

Together, it flows back into the pipeline, and the internal valve will also automatically close to playing a command role. When the swing check valve is installed in a horizontal pipe, the internal medium in the pipe can also flow from Dynamic closing.

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