A high temperature and high pressure gate valve

Abstract

A high-temperature and high-pressure gate valve, including a valve body, a valve seat, a valve plate and a valve stem, the valve body has an inlet, an outlet and a valve chamber, the inlet has a first through hole, and the first through hole communicates with the valve chamber; the outlet has a The second through hole, the second through hole communicates with the valve chamber; the inlet part and the outlet part are respectively provided with valve seats; the valve rod is arranged in the valve chamber and the lower end is connected to the valve plate to move the valve plate up and down to control the flow through the valve chamber The cross-section of the valve plate is V-shaped; the valve plate includes a V-shaped body, the V-shaped body has a closed portion and an opening portion, and the opening portion is pivotally connected to a stretching mechanism; the stretching mechanism is connected to the valve stem When the valve plate moves down to completely close the flow from the inlet to the outlet, the stretching mechanism can convert the downward pressure of the valve stem into the horizontal force of the mouth opening to both sides and the vertical downward force of the valve plate To seal the valve chamber. The high-temperature and high-pressure gate valve not only has a V-shaped valve plate structure, but also effectively solves the boiler effect phenomenon of the valve plate through the action of the connecting rod mechanism on the opening of the V-shaped valve plate. The synergistic effect of the two is safe and effective.

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

Images