The opening and closing parts of the high-pressure gate valve are the gate valve. The movement direction of the gate valve is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The movement form of the valve rod includes the lifting rod type - the valve rod lifting, the handwheel does not lift, and the lifting rotating rod type (the handwheel rotates with the valve rod to lift, and the nut is set on the valve body).
（1） Features of high pressure gate valve
1. The middle flange bolt connection is adopted, and the two ends of the branch pipe are of flange connection structure.
2. The sealing surface of valve seat is made of iron-based chromium nickel stainless steel by overlaying welding, which has good wear resistance and scratch resistance.
3. The surface of the valve rod is treated by anti-corrosion nitriding, which has good anti-corrosion and anti scratch properties.
4. The closing and opening of the valve are controlled by an electric device installed on the valve cover. The electric device is equipped with valve special motor, reducer, torque control mechanism, stroke control mechanism, field operation mechanism, manual and electric switching mechanism. The switch of the valve is adjusted by the stroke control mechanism, and the torque limiting mechanism is adjusted to protect the valve when the stroke control mechanism fails. Valve closing is mainly composed of electric device and adjustable wedge double ram, omnidirectional top, clamp ring, etc., which makes lifting movement by the guide of valve body.
5. In addition to local operation, the electric device can also be operated remotely.
（2） Structural characteristics and application of high pressure gate valve
1. The electric high-pressure gate valve has compact structure, reasonable design, good rigidity, smooth channel and small flow resistance coefficient.
2. The sealing surface of gate valve in high pressure power station is made of stainless steel and hard alloy, with long service life.
3. The electric high-pressure gate valve adopts flexible graphite packing, reliable sealing, easy and flexible operation.
4. The driving mode is divided into dynamic, electric, pneumatic and gear driving. The structural types are: elastic wedge single gate valve, rigid wedge single gate valve and double gate valve.
5. High pressure power station gate valve is widely used in petrochemical, thermal power plants and other oil and water steam pipelines as the opening and closing device to connect or cut off the medium in the pipeline.