Double seal valve

Abstract

This invention provides a dual-sealing valve, which is used under the condition that the controlled liquid is flowed in double-way, and can realize opening function under less opening power. The dual-sealing valve includes valve body with in-outlet, and two sealing elements disposed in a valve cavity which is in the valve body and matched with the inlet and the outlet. A linkage synchronization unit is disposed between the two sealing elements, and a pressure relieving device is connected between the valve cavity and the in-outlet. The valve reduces not only the opening-closing moment greatly, but also the volume of the outside operation device and the requirement of the power source, thus the operation speed of the valve and the service life of the valve are improved. Moreover, the valve has realized self-dual-sealing in double-way, and achieved no damage rapid switch by the linkage synchronization unit. Thus the reliability of the inside operation of the valve is improved, and the cost of the valve is reduced. This invention applies especially in the environment of large flux and high pressure, which requires good sealing performance, intrinsically safe, and frequently rapid switch.

Description

technical field

[0001] The invention relates to a valve, especially a double-seal valve used in the environment where the controlled fluid flows in two directions. Background technique

[0002] The common valves in the existing industry have three basic structural types: gate valve, flat valve and butterfly valve. For large-scale program-controlled valves, the pressure on the valve plate is very huge, for example: pipe diameter = 400mm, pressure = 25kg / cm 2 , the valve plate pressure is about 30000KG. Therefore, there are four main indicators to measure its performance: action and regulation, sealing, reliability and valve resistance.

[0003] 1. For action and adjustment: the structure type and working principle of the valve determine the limit that the above indicators can achieve. The main resistance of the gate valve during the valve switching process comes from the frictional resistance between the valve plate and the sealing surface; the main resistance of the flat v...

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