A reversing valve used in underground fluid sampling process

Abstract

The invention provides a reversing valve applied to an underground fluid sampling process. The reversing valve comprises a valve body top cover, a valve body, a valve element, a spring and a valve body bottom cover. A valve body gas inlet connected with a high-pressure gas source is formed in the middle of the valve body top cover. A valve body fluid inlet and a valve body fluid outlet are formed in the middle of the valve body. An L-shaped through hole is formed in the top end of the valve element, and a transverse straight-through hole is formed in the middle of the valve element. A spring is mounted on the lower portion of the valve element and the protrusion portion of the inner side of the valve body bottom cover. In a natural state, the valve body fluid inlet, the straight-through hole of the valve element and the valve body fluid outlet communicate to form a passageway, and outside environment fluid naturally flows in. After high-pressure gas enters the L-shaped through hole through the valve body gas inlet, the valve element is pushed to move downwards, finally a valve element L-shaped through hole gas outlet communicates with the valve body fluid outlet, and the outside fluid cannot flow in. According to the reversing valve, a gas channel and a fluid channel are separated, the fluid channel is in a normally opened state, underground water can freely flow into a sampling device, no pressure sensitive element is arranged, and no start pressure is generated.

Description

technical field [0001] The invention relates to the technical field of instrument valve control, in particular to a reversing valve used in an underground fluid sampling process. Background technique [0002] In the field of underground environmental pollution monitoring and control, it is necessary to collect underground fluid at a certain depth for testing and analysis. At the same time, in hydrogeological investigation, monitoring of underground storage of garbage and waste, and CO 2 Fields such as geological storage require sampling and monitoring of groundwater. However, the existing monitoring technology in China cannot fully meet the needs. Among them, the gas-driven U-tube sampler is one of the most effective sampling devices, but due to its core component—one-way valve or similar functional components The performance is unstable, and it is easy to be blocked by sand and cause component failure. Once such components fail, it means that the entire sampling layer is...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, in order to solve the defects of unstable service life and easy blockage and failure of the one-way valve, the traditional one-way conduction idea is expanded to the idea of ​​direction control. Reversing valve, the structure design of this device is ingenious and novel, which separates the gas channel and the liquid channel, and the liquid channel is in a normally open state, the sampling liquid can freely flow into the sampling device, no pressure sensitive components, no starting pressure, and can withstand higher pressure , has low requirements on the liquid environment of the application, and has good application value

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