The opening and closing part of the vacuum gate valve is a gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. Its products have fixed price advantages and technical advantages in the industry. The gate has two sealing surfaces. The two sealing surfaces of the commonly used model gate valves form a wedge. The wedge angle varies according to the valve parameters, usually 50. When the medium temperature is not high, it is 2°52. The gate of the wedge gate valve can be made into a whole, which is called a rigid gate. It can also be made into a slightly deformed gate to change its manufacturability and make up for the deviation of the angle of the sealing surface during processing. This kind of gate is called an elastic gate. The valve is generally installed horizontally.
The types of vacuum gate valves, national standard gate valves, and cast steel gate valves can be divided into wedge gate valves and parallel gate valves according to the configuration of the sealing surface. Wedge gate valves can be divided into single gate, double gate and elastic gate valves, and parallel gate valves can be divided into Single gate type and double gate type. According to the thread position of the valve stem, it can be divided into bright stem gate valve and dark stem gate valve.
When the vacuum valve gate valve is closed, the sealing surface can only be sealed by the medium pressure, that is, the sealing surface of the gate is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, that is, self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the gate should be forced against the valve seat by external force to ensure the tightness of the sealing surface.
The gate of the vacuum gate valve moves linearly with the valve stem, which is called the lifting stem gate valve (also called the rising stem gate valve). Usually, there is a trapezoidal screw on the lifting rod, through the nut on the top of the valve and the guide groove of the valve body, the rotation becomes linear motion, that is, the operating torque becomes the operating thrust.