The main purpose

The products cover the main steam and main water supply conditions of 600MW to 1000MW super (super) critical units, with the pressure level up to Class 4500, meeting the requirements of steam and water medium isolation in large-size pipes for main steam and main water supply of super (super) critical units.

Features

• The valve body is integrally forged from the same material as the pipeline, with reliable pressure bearing and beautiful appearance;

• The gate plate adopts the same fully forged structure as the valve body. The sealing surface of the gate plate and valve seat is overlayed with STL carbide, which is high temperature resistant and has a tight and reliable seal;

• Using a combination of braided and reinforced graphite packing, the compression nut is equipped with a pair of butterfly springs to continuously provide compression force and the valve stem seals reliably;

• The pressure self-sealing part of the valve cover adopts an anti-ablation reinforced self-sealing ring, which can reliably seal at 650°C;

• For gate valves used for main steam parameters, a self-sealing ring preloaded stud external structure is adopted to ensure the safe operation of the product under ultra-high temperature and high pressure conditions;

• For the main steam working condition, the high-temperature material column bracket is used to improve the heat dissipation effect of the bracket, effectively reduce the temperature of the actuator, and improve the reliability of the valve;

• For large-diameter main water supply gate valves, design inlet and outlet bypass valves to effectively reduce valve opening and closing torque.

Main design specifications