Globe valve with flexible ferrule

Abstract

The invention discloses a cut-off valve with an elastic spiral ferrule. Including valve body, valve seat, disc, stem, packing, pin shaft, bonnet, stem nut and handwheel. An elastic spiral ferrule is arranged between the lower part of the valve stem located in the valve body and the valve clack. Some shortcomings of modern valves are solved by combining split flow decompression and anti-cavitation principles and sealing structures. The invention makes full use of the elastic spiral ferrule to keep the shut-off valve fully open for a long period of time, thereby achieving the functions of sealing, reducing pressure and diverting flow, preventing cavitation, reducing impact corrosion of the valve stem by fluid, and preventing vibration and noise. Acts as a safety valve in the event of stem nut failure. The impact resistance and noise resistance of the stop valve are improved, and the life of the stop valve is increased at the same time, so as to meet the performance requirements of various special fluid media for the stop valve. The invention can meet the needs of fields such as petroleum, chemical industry and water conservancy.

Description

technical field [0001] The invention relates to a shut-off valve, in particular to a shut-off valve with an elastic spiral ferrule. Background technique [0002] Due to the small friction between the sealing surfaces during the opening and closing process, it is relatively durable, the opening height is not large, it is easy to manufacture, and it is convenient to maintain. It is not only suitable for medium and low pressure, but also suitable for high pressure. 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. 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 the sealing reliability is not strong during long-term operation. [000...

AI Technical Summary

Problems solved by technology

[0004] However, during the design and processing of existing globe valves, the sealing performance of the valve body when the valve is fully open and the impact corrosion of the valve stem in special fluids are rarely considered, and there are few studies on keeping the valve open for a long time , thus affecting the performance and service life of the valve. Therefore, it is of great practical significance to develop a globe valve with an elastic spiral ferrule that can keep the valve working normally under the fully open state.

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