Double-sealing wash-free high-pressure stop valve

Abstract

A dual-sealing high-pressure cut-off valve without flush is composed of valve body and dual-sealing unit. Said dual-sealing unit features that the circular valve rod under the upper sealer passes through spring holder, compressed spring and protecting cover of valve flap and then connected to the valve flap. Under the action of spring and valve rod, the outlet channel is controlled by said protecting cover of valve flap and the inlet channel is controlled by valve flap.

Description

Technical field: [0001] The invention relates to a valve in a pipeline system, in particular to a double-seal, scour-free high-pressure cut-off valve that protects the sealing pair. Background technique: [0002] At present, most of the sealing pairs of high-pressure globe valves of similar products are single-sealed, that is, a sealing pair composed of a disc and a valve seat is used to open and close the fluid. This single-sealed pair operates under harsh conditions such as high temperature and high pressure. The surface is severely damaged by erosion, especially when the valve is opened and closed, the sealing surface of the sealing pair is more severely damaged by the erosion of high-speed fluid. This phenomenon directly affects the service life and safe operation of the valve. Sealing rings are used to realize auxiliary sealing valves. For example, the CN2367863Y Chinese utility model patent specification announced on March 8, 2000 discloses such a "multi-stage sealing ...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the sealing pairs of high-pressure globe valves of similar products are single-sealed, that is, a sealing pair composed of a disc and a valve seat is used to open and close the fluid. This single-sealed pair operates under harsh conditions such as high temperature and high pressure. The surface is severely damaged by erosion, especially when the valve is opened and closed, the sealing surface of the sealing pair is more severely damaged by the erosion of high-speed fluid. This phenomenon directly affects the service life and safe operation of the valve. Sealing rings are used to realize auxiliary sealing valves. For example, the CN2367863Y Chinese utility model patent specification announced on March 8, 2000 discloses such a "multi-stage sealing valve". The main seal of this valve is a conventional single sealing form, so The added auxiliary seal is that the sealing ring installed on the main valve clack cooperates with the side of the middle hole of the valve body to seal and uses its lower end to block the fluid. Strictly speaking, this method has not jumped out of the range of single seal, and increases the valve’s capacity. Sealing specific pressure, especially in the case of high pressure difference and large diameter, the closing moment of the valve is relatively large. When the valve is in the normally open state, the main disc is inevitably washed by the fluid like the single-sealed valve.

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