Gate valve structure diagram Working principle of gate valve

Gate valve refers to the valve in which the gate closing part moves in the vertical direction along the center line of the passage. Generally composed of valve body, valve seat, valve stem, gate plate, valve cover, sealing ring several parts, can be converted into a variety of electric gate valve and pneumatic gate valve through the transmission device and gate valve equipped, in the pipeline can only be used for full opening and full closing cut off, can not be adjusted and throttling.

Gate valve working principle:

The gate valve's gate plate moves in a straight line with the valve stem, usually there is a trapezoidal thread on the lifting rod, and through the nut at the top of the valve and the guide groove on the valve body, the rotating motion becomes a straight line motion, that is, the operating torque becomes the operating thrust.

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

 

Gate valve open

When the lift height of the gate is equal to 1:1 times the diameter of the valve, the channel of the fluid is completely unblocked, but this position can not be monitored during operation. In actual use, it is the vertex of the valve stem as a sign, that is, the position of the opening cannot be moved, as its full open position. In order to consider the temperature change, the locking phenomenon is usually opened to the apex position, and then reversed 1/2-1 turns, as the position of the fully opened valve. Therefore, the fully open position of the valve is determined by the position of the ram (that is, the stroke >)