Rotary starting type check valve of water hammer prevention mechanism for pipelines

Abstract

The invention relates to a rotary starting type check valve of a water hammer prevention mechanism for pipelines. The rotary starting type check valve comprises a valve body, wherein a valve part and a valve base are mounted in the valve body; the valve part is mounted in the valve body through a swing arm and a lifting plate; the lifting plate is n-shaped, and is mounted in the valve body through a support plate; the support plate is transversely placed in an inner cavity of the valve body, and is fixedly connected with the inner side wall of the valve body; the swing arm is arranged at the lower end of the lifting plate, and is fixed on the lifting plate through a pin shaft; the lower end of the swing arm is fixedly connected with the valve part; and the pin shaft is coated with a compression spring. The rotary starting type check valve has the following advantages: as the internal compression spring is added, preopening force is provided to the valve part when a medium normally flows, the valve is quickly opened, and the flow resistance is reduced; and when the medium flows back, slow closing force is provided to the valve part at the moment of closing the valve part, so that the closing speed is slowed down, the collision force of the valve part to a sealing surface is reduced, the water hammer phenomenon can be effectively prevented, the safe operation of the pipelines is guaranteed, and the service life of the pipelines is prolonged.

Description

technical field [0001] The invention relates to a check valve, in particular to a swing check valve with anti-hammer mechanism for pipelines. Background technique [0002] As the name implies, the check valve is a one-way check valve. When the medium flows forward, the valve disc opens under the action of fluid pressure; when the medium flows in the reverse direction, the valve disc closes under its own gravity and reverse fluid pressure, blocking the channel. , to prevent the backflow of medium from damaging the equipment after the valve. For example, in the most common pump water supply system, when the system suddenly stops running for some reason, the pressure in the pump disappears, and the high-pressure water connected to the pump outlet will flow back to the pump in reverse. If there is no check valve at the pump outlet, the high-pressure The water will flow back to the pump in reverse, and the impeller of the pump will reverse under the impact of high-pressure water...

AI Technical Summary

Problems solved by technology

When the water pump is running again, the impeller may fly out, which poses a great threat to safe production

[0003] At present, the micro-resistance slow-closing heavy hammer check valve is used for the check valve installed on the pipeline, but the micro-resistance slow-closing heavy hammer check valve currently in use on the market needs to extend the pin shaft out of the valve body. , and then equipped with a heavy hammer; the valve body of this structure needs to process the stuffing box, and the pin shaft needs to add packing, packing pressure sleeve, packing pressure plate, anti-rotation key, rocker, heavy hammer, bolts and nuts and other parts; processing and assembly It is cumbersome and costly, and the valve with this structure has an extra leakage point at the pin shaft. At the same time, because the rocker and the weight protrude out of the valve body, the valve will put forward higher requirements for the installation space. And the heavy hammer rotates at high speed outside the valve body, which also has great safety hazards

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