IFAN Gate Valve

The opening and closing part of a medium pressure gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and closed, and cannot be adjusted and throttled. The gate has two sealing faces. The two sealing faces of the most common type of gate valve form a wedge. The wedge Angle varies with the valve parameters, usually 50, and 2°52' when the medium temperature is not high. Wedge gate valve disc can be made into a whole, called rigid disc; Can also be made into a trace deformation of the gate, in order to improve its technology, make up for the Angle of the sealing surface in the process of the deviation, this kind of gate is called elastic gate.

When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, only rely on the medium pressure to press the sealing surface of the gate to the other side of the seat to ensure the sealing surface of the sealing surface, which is self-sealing. Most GATE valves are forced sealed, that is, when the valve is closed, to rely on external force to force the gate to the seat, to ensure the sealing surface of the sealing.

The gate valve with the valve stem for linear motion, called lift rod gate valve (also known as Ming rod gate valve). Usually there are trapezoidal threads on the lifting rod, through the nut at the top of the valve and the guide groove on the body, the rotary motion into straight motion, that is, the operation torque into the operation thrust.

When THE VALVE IS OPENED, WHEN THE GATE LIFT HEIGHT EQUALS 1:1 TIMES THE VALVE DIAMETER, THE FLOW PASSAGE IS COMPLETELY CLEAR, BUT THIS POSITION CANNOT BE MONITORED DURING OPERATION. In practice, the apex of the stem is used as a mark, that is, the position of the unmoving, as its full open position. In ORDER TO ACCOUNT FOR TEMPERATURE CHANGES IN THE OCCURRENCE OF LOCKING PHENOMENON, USUALLY OPEN TO THE VERTEX position, AND THEN REVERSE 1/2-1 turn, as the full open valve position. Therefore, the full open position of the valve, according to the position of the ram (that is, stroke > to determine.

Some gate valves, the stem nut is located on the gate plate, the handwheel turns to drive the stem to rotate, and the gate plate is lifted, this valve is called rotating stem gate valve or dark stem gate valve.

Turn the HANDwheel TO open and close the valve plate connected with the stem by advancing or retreating the handwheel and the stem

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