Structural Characteristics of Power Station Gate Valves
A power station valve is also called a dedicated valve for power stations, which is mainly used in the pipeline of various systems in thermal power plants to cut off or connect pipeline media. It is suitable for non-corrosive media such as water and steam. Compared with other valve products, power station valves are characterized by high temperature and high pressure and unique self-sealing design. The higher the pressure is, the more reliable the seal becomes. Power station valves have characteristics which can't be replaced by other valves because of their special performance, technical characteristics and working conditions. Power station valves are divided into four categories: power station gate valves, power station globe valves, power station check valves and high temperature and high-pressure power station valves.
The characteristics of structure of power station gate valves are as follows:
The characteristics of structure of power station gate valves are as follows:1. Power station gate valves are designed according to the latest domestic and foreign standards, which have stable and reliable sealing performance, excellent performance and a long service life.
2. The valve plate of power station gate valves is classified into wedge type elastic single plates and wedge-type double plates.
3. The structure of wedge type elastic single plates and wedge-type double plates can avoid the deformation of the valve body due to temperature changes, resulting in jamming of valve plates. The elastic compensation effect of elastic grooves and free swing of double plates can compensate the sealing leakage caused by the deformation of the valve seat body, and the sealing performance is reliable.
4. The sealing surface of the valve plate and seat is welded with cobalt based hard alloy, which is wear-resistant, high-temperature resistant, corrosion-resistant, scratch-resistant and has a long service life.
5. The valve cavity adopts a pressure self-tightening seal. Under the action of the medium pressure, the valve bonnet moves upward to form a seal at the conical sealing ring. The higher the medium pressure is, the greater the sealing force becomes; sealing is reliable.
6. The valve stem is treated with anti-corrosion nitriding, and the surface hardness of the valve stem is as high as 800 to 1200HV, which makes the valve have good corrosion resistance and scratch resistance.
7. Top mounted stem nuts: The valve nut is equipped with a thrust bearing to reduce the valve opening and closing torque, and it is flexible and easy to open and close the valve.
3. The structure of wedge type elastic single plates and wedge-type double plates can avoid the deformation of the valve body due to temperature changes, resulting in jamming of valve plates. The elastic compensation effect of elastic grooves and free swing of double plates can compensate the sealing leakage caused by the deformation of the valve seat body, and the sealing performance is reliable.
4. The sealing surface of the valve plate and seat is welded with cobalt based hard alloy, which is wear-resistant, high-temperature resistant, corrosion-resistant, scratch-resistant and has a long service life.
5. The valve cavity adopts a pressure self-tightening seal. Under the action of the medium pressure, the valve bonnet moves upward to form a seal at the conical sealing ring. The higher the medium pressure is, the greater the sealing force becomes; sealing is reliable.
6. The valve stem is treated with anti-corrosion nitriding, and the surface hardness of the valve stem is as high as 800 to 1200HV, which makes the valve have good corrosion resistance and scratch resistance.
7. Top mounted stem nuts: The valve nut is equipped with a thrust bearing to reduce the valve opening and closing torque, and it is flexible and easy to open and close the valve.