High-pressure check valve

Abstract

The invention discloses a high-pressure check valve. The high-pressure check valve comprises a valve body, wherein a water inlet is formed in one end of the valve body, a water outlet is formed in theother end of the valve body, a gate seat is arranged on one side of the water inlet, a valve plug A is arranged on one side of the gate seat, a first chute is formed in one side of the valve plug A,a water flow channel is formed between the first chute and the valve body, a first fixed pin is arranged on the valve plug A, a second fixed pin is arranged in the first chute, a spring A is connectedbetween the first fixed pin and the second fixed pin, a connecting rod is arranged on one end of the valve plug A, the other end of the connecting rod passes through the first chute and is fixed to avalve plug B, a second chute is formed in one side of the valve plug B, a third fixed pin is arranged on the valve plug B, a fourth fixed pin is arranged in the second chute, and a spring B is connected between the third fixed pin and the fourth fixed pin. The high-pressure check valve has the advantages of convenience in use, simple structure, long service life and good sealing performance.

Description

technical field [0001] The invention relates to a high-pressure single-flow valve, and specifically belongs to the technical field of valves. Background technique [0002] The check valve is that the fluid can only flow along the water inlet, but the outlet medium cannot flow back, commonly known as the check valve. Check valve is also called check valve or check valve. Used in hydraulic systems to prevent reverse flow of oil flow, or used in pneumatic systems to prevent reverse flow of compressed air. There are two types of check valves, straight-through and right-angle. The straight-through check valve is installed on the pipeline with a threaded connection. There are three types of right-angle check valves: threaded connection, plate connection and flange connection. The high-pressure check valve is used in the process flow of water injection wells to prevent the backflow of the oil casing caused by the difference in pressure in the oil-cassette injection well. Howeve...

AI Technical Summary

Problems solved by technology

The high-pressure check valve is used in the process flow of water injection wells to prevent the backflow of the oil casing caused by the difference in pressure in the oil-cassette injection well. However, when the existing check valve faces high-pressure water flow for a long time, the valve body It is easy to be damaged, the sealing performance of the valve body is poor, and the phenomenon of backflow is easy to occur when the valve plug is closed; some high-pressure single-flow valves are installed vertically in actual use, and the water inlet is easy to accumulate water, and the internal spring is under the pressure of water for a long time , the stiffness coefficient of the spring will decrease, causing the valve plug to fail to close completely, and there will be problems with the sealing of the check valve.

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