Stop valve

Abstract

The invention provides a stop valve, which is provided with a valve body, a valve cover is fixedly arranged on the valve body and is internally provided with sealing filler, a valve-stem nut is arranged above the valve cover, a valve stem penetrates through the valve-stem nut, the sealing filler and the valve cover, and extends into the valve body, the lower tail end of the valve stem is connected with a valve clack, and a valve clack sealing surface of the valve clack is matched with a valve seat sealing surface in the valve body. The stop valve is characterized in that the upper end of the valve cover is fixedly connected with a valve-stem nut stopper which is provided with a circular groove, an annular protruded wall of the valve-stem nut is embedded into the circular groove, the valve-stem nut is capable of rotating, external threads of the valve stem are in screw arrangement with internal threads of the valve-stem nut, the inner wall of the valve cover is provided with a guide groove, and a locating pin, extending towards the lateral direction, of the valve stem extends into the guide groove to cause the valve stem to perform axial movement. The stop valve, disclosed by the invention, is long in service life, good in sealing performance and low in cost.

Description

technical field [0001] The invention relates to a stop valve structure. Background technique [0002] Globe Valve (stop valve, Globe Valve), also called cut-off valve, is one of the most widely used valves. The reason why it is popular is that the friction between the sealing surfaces is small during the opening and closing process, and it is relatively durable. The opening height is small, easy to manufacture and easy to maintain, not only suitable for medium and low pressure, but also suitable for high pressure. [0003] The closing principle of the globe valve is to rely on the pressure of the valve rod to make the sealing surface of the disc and the sealing surface of the valve seat fit closely to prevent the flow of medium. [0004] The stop valve only allows the medium to flow in one direction, and it is directional when installed. The structural length of the stop valve is longer than that of the gate valve, and at the same time, the fluid resistance is large, and t...

AI Technical Summary

Problems solved by technology

[0013] The packing gland 13' of this valve is exposed type, and the sealing packing 19' is a conventional sealing type, which can easily cause medium leakage during the opening and closing process of the valve.

[0014] Disc cover 4' is welded and fixed on disc 2', which is not convenient for maintenance, and the welding surface 24' is easy to corrode, and disc 2' cannot be disassembled after being fixedly connected with disc cover 4' and valve stem 5' , the disc sealing surface 20' cannot be replaced

[0015] This kind of valve is very easy to form bubbles, bubbles, leaks and drops of the medium after being used for a certain period of time, which greatly affects energy saving.

If it is used in pharmaceuticals, it will increase the probability of bacterial contamination of traditional Chinese medicine in pharmaceutical production, and the product quality cannot be guaranteed.

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