Small thrust straight pushing type dwell check valve under condition of ultrahigh pressure environment

Abstract

The disclosed valve includes small piston, small cylinder body, compression spring, large piston, air out cap, large cylinder body, connector, valve body and valve needle. Large cylinder body is fixed in back end of small cylinder body. Compression spring is setup on piston rod in front end of the large piston, and valve needle is connected to back end. The said piston rod is setup at back end of cavity of the small cylinder body. There is air out cap, connector, and valve body etc. at back end of the large cylinder body so as to form pressure chamber of small cylinder, pressure chamber of large cylinder, and spring cavity. Pressure chamber of small cylinder through a small hole is connected to pressure chamber of large piston. The disclosed small thrust switch in superhigh pressure loop realizes controlling the valve with no mechanical and electrical connection. Thus, it is convenient to use the valve in equipment for remote operation.

Description

technical field [0001] The invention relates to a pressure-maintaining stop valve, in particular to a low-thrust direct-push pressure-maintaining stop valve for a deep-sea sampler. It is used in the field of marine engineering instruments. Background technique [0002] There is a high-pressure or ultra-high-pressure environment in large-depth underwater or pressure vessels. In this environment, pressure loop control often requires a pressure-holding stop valve that can be operated by simple remote control and can be switched under this environment pressure. For example, most of the submarine hydrothermal fountains are distributed on the seabed at a depth of 1000-6000 meters. The chemical composition and microorganisms in the hydrothermal fluid ejected from them have attracted widespread attention in the scientific community. To study this liquid, it is necessary to collect it in situ real samples. The usual practice is to take samples by remote manned or special samplers o...

AI Technical Summary

Problems solved by technology

But this motor-driven on-off valve has the following three disadvantages: one, because it is driven by a motor, each sampler must be powered by the submersible and controlled separately. Because a large number of samplers need to be carried during deep-sea sampling, the interference of the power line is seriously serious. It affects the sampling operation and takes up the resources of the submersible. Second, due to the high pressure environment, the drive motor needs to be oil-filled and sealed, and a specific compensation mechanism must be used to balance the pressure difference between the inside and outside of the sealed cavity. The technology is complicated and the cost is high. Reliability Low; three, since the size of the valve port pressing force is determined by monitoring the current of the motor, the uncertainty of the pressing force is increased

Images