Stop valve with high-temperature and high-pressure air leakage prevention function

Abstract

The stop valve comprises a valve pipe, a fixed box is fixedly arranged on the outer wall of the upper end of the valve pipe, a connecting box is fixedly connected to the lower end of the valve pipe, and a valve rod is rotationally connected into the valve pipe; a first valve and a second valve which are symmetrically distributed are fixedly connected to the outer wall of the valve rod, the first valve and the second valve are both in sliding connection with the valve pipe, the two ends of the valve pipe are both connected with flanges, an adjusting mechanism is arranged in the fixing box, and the valve rod is connected with the first valve through a dismounting mechanism. According to the stop valve, a medium can be prevented from making direct contact with the valve rod, the sealing performance of the stop valve is improved, gas leakage is further avoided, the practicability of the stop valve is improved, the service life of the stop valve body is prolonged, the alarm effect can be achieved when the first valve is abraded and leaks, and then the warning effect is achieved for workers.

Description

technical field [0001] The invention relates to the technical field of cut-off valves, in particular to a cut-off valve with a function of preventing gas leakage at high temperature and high pressure. Background technique [0002] The high-temperature and high-pressure globe valve, also known as the cut-off valve, is the most widely used valve. The reason why it is popular is that the friction between the sealing surfaces during the opening and closing process is small, it is more durable, the opening height is not large, and it is easy to manufacture. , easy maintenance, not only suitable for medium and low pressure, but also suitable for high pressure. Its closing principle is that relying on the pressure of the valve stem, the sealing surface of the valve disc and the sealing surface of the valve seat are closely fitted to prevent the flow of the medium. The insulation globe valve only allows the medium to flow in one direction, and has directionality during installation...

AI Technical Summary

Problems solved by technology

[0003] However, when the existing globe valve cuts off the medium in the pipeline, the valve stem is in direct contact with the medium, and the medium is easy to leak out from the gap between the valve stem and the valve body, and the leakage prevention effect is poor. , the sealing reliability is not strong, which affects the normal use of the stop valve and cannot meet people's needs. In view of the above defects in the prior art, it is necessary to further improve it to make it more practical

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