Basic introduction of swing check valves

The swing check valve is applicable to the pipeline with a working temperature of - 29 ℃ to 425 ℃ and the medium of water, steam, oil, etc. It is used as a single hoist to prevent the reverse flow of the medium on the pipeline.

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●Basic introduction of swing check valves

Basic introduction of swing check valves

The rotary check valve is a kind of check valve, in which the valve disc rotates around the rocker shaft in the body cavity. The opening and closing principle of the rotary check valve is the same as that of the lifting gem check valve, but it will move automatically according to the fluid pressure and the weight of the valve disc, but the valve disc will open and close by rotating instead of moving up and down. When moving, the inlet direction of the fluid must be on the side that will affect the rotation of the valve disc. The closed part of a swing check valve is the valve disc or valve disc. The diameter is the same as the pipe and is suspended in the valve chamber. As the fluid flows forward, the pressure of the emergency shutoff valve fluid will open the valve disc. When the pressure drops, the disc will open. It closes under the pressure of dead weight and countercurrent fluid. The swing check valve is composed of a valve body, valve cover, valve disc, and rocker. The valve crack is disc-shaped and rotates around the pin shaft outside the valve seat channel. The channel in the valve has been simplified, and its flow resistance is lower than that of the straight-through lift check valve applicable to large-diameter pipes. However, under low pressure, its sealing performance is not as good as that of the lift check valve. An auxiliary spring or heavy hammer structure can be used for auxiliary sealing to improve sealing performance. Due to the weight of the valve disc, opening the swing check valve can provide relatively high fluid resistance. In addition, the disc is suspended in the fluid, which may cause turbulence. This also indicates that the hydraulic pressure drop from the rotary check valve is greater than that from other types of check valves. A sudden change in the flow direction may cause the valve disc on the valve seat to close violently, resulting in greater wear on the valve seat and water hammer along the pipeline. To solve this problem, damping devices can be installed on the disc and metal. The valve seat reduces wear of the valve seat.

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