Views: 0 Author: Site Editor Publish Time: 2019-07-30 Origin: Site
The gate of the gate valve moves linearly with the valve stem, called the lift gate valve (also called the open gate valve). Usually, trapezoidal threads are provided on the lifting rod, and the rotary motion is changed into a linear motion by the nut at the top end of the valve and the guide groove on the valve body, that is, the operating torque is changed to the operating thrust. The sealing surface can be sealed only by the pressure of the medium, that is, the sealing surface of the ram is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self-sealing. Most of the gate valves are forced to seal, that is, when the valve is closed, the external force is forced to press the gate to the valve seat to ensure the sealing of the sealing surface.