Special stop valve for oxygen

Abstract

The invention is suitable for the technical field of valves, and provides a special stop valve for oxygen, a bypass channel is arranged between an inlet flange joint and an outlet flange joint of the stop valve, the opening and closing of the valve are operated under the condition of pressure balance, airflow impact is avoided, and the use safety is improved; the valve rod adopts a non-rising stem type structure, is isolated from the outside, is not polluted by the external environment, is safe and reliable, and is long in service life; the sealing part on the valve rod adopts a double-layer stuffing box structure, so that the sealing is more reliable; the valve clack can slightly swing relative to the valve rod, so that the sealing reliability between the valve clack and the valve seat can be ensured under the condition of reducing the form and position precision processing and assembling difficulty; the electrostatic grounding screw is arranged on the valve body and can be connected with a wire to realize electrostatic grounding during installation, thereby being safe and reliable; the valve rod only makes contact with the guide friction copper ring in the vertical movement process, and the service life is effectively prolonged; the valve clack is made of Monel alloy surfacing stellite alloy, the hardness of the sealing face is effectively improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to an oxygen-specific stop valve. Background technique [0002] Globe valve, also called cut-off valve, has small friction force between sealing surfaces during opening and closing, relatively durable, small opening height, easy manufacture, and convenient maintenance. 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 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. [0003] Oxygen is a strong oxidant medium, and safety accidents often occur in oxygen supply systems, so users have higher...

AI Technical Summary

Problems solved by technology

[0004] However, the above valves are difficult to meet the increasingly higher safety requirements. The material of the conventional manual globe valve has strict restrictions on the pressure and flow rate of oxygen. There are potential safety hazards in contact with oxygen; the main seal of the ball valve is made of non-metallic material, and its ignition point is very low in an oxygen-enriched environment, which poses a large safety hazard; the switching speed of the pneumatic switch is fast, and it is easy to generate shock and heat, and the electric switch is easy to generate electric sparks , greater security risks

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