High-temperature high-pressure brake valve

Abstract

A high-temperature high-pressure brake valve comprises a valve body, valve bases, a valve plate and a valve rod; the valve body is provided with an inlet portion, an outlet portion and a valve chamber, the inlet portion is provided with a first through hole, and the first through hole is communicated with a valve chamber; the outlet portion is provided with a second through hole, and the second through hole is communicated with the valve chamber; the inlet portion and the outlet portion are each provided with one valve base; the valve rod is arranged in the valve chamber, the lower end of the valve rod is connected with the valve plate, the flow flowing through the valve chamber is controlled through the vertically-moving valve plate, and the cross section of the valve plate is in a V shape; the valve plate comprises a V-shaped body which is provided with a closing portion and an opening portion; the opening portion is in pivot connection with a supporting and pulling mechanism which is connected to the valve rod; when the valve plate moves downwards to completely close the flow from the inlet portion to the outlet portion, the supporting and pulling mechanism can convert down force of the valve rod into horizontal force of opening of the opening portion towards the two sides and vertical down force of the valve plate so as to block the valve chamber; according to the high-temperature high-pressure brake valve, the V-shaped valve plate structure is designed, meanwhile, a connecting rod mechanism acts on the opening portion of the V-shaped valve plate, so that the boiler effect phenomenon of the valve plate is effectively avoided, the coordinative effect is achieved, and safety and effectiveness are achieved.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a high-temperature and high-pressure gate valve. Background technique [0002] High temperature and high pressure gate valves are more and more widely used in the field of nuclear power. In nuclear power plants, gate valves are subject to high-temperature and high-pressure fluids, which will inevitably produce deformation and stress, which is the gate valve boiler effect. In March 1991, when unit 5 of the French BUGEY nuclear power plant was conducting a sealing test of the containment isolation valve EAS014VB, it was found that it could not be opened. In 2003, a nuclear power plant imported from France also had an incident where the valve plate of the gate valve was seriously deformed due to the boiler effect and then lost its sealing. The boiler effect is essentially a temperature effect, some heat source will heat the water in the inner space of the closed gate valve, and mak...

AI Technical Summary

Problems solved by technology

In March 1991, when Unit 5 of the BUGEY nuclear power plant in France conducted the sealing test of the containment isolation valve EAS014VB, it was found that it could not be opened.

In 2003, a nuclear power plant imported from France also had an incident where the valve plate of the gate valve was seriously deformed due to the boiler effect and then lost its sealing.

This pressure rise will make the gate valve unable to open or the gate will be deformed and its tightness cannot be guaranteed.

[0003] CN2046647375U of Nantong Guodian Power Station Valve Co., Ltd. discloses a hard self-sealing gate valve for nuclear power island core with high pressure and piping for pressure relief. It adopts a hard self-sealing gate valve. The gate plate of this gate valve is easy to swell in a long-term high-temperature environment. Deformation, compression and adhesion with the valve seat, resulting in the fact that the actual required opening torque of the gate valve is greater than the design value of its electric head, which may cause the gate valve to fail to open or the gate plate to deform and lose its tightness

This is the boiler effect, and once there is an accident that cannot be opened, it will cause production to be stopped for maintenance and bring losses to the enterprise

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