Supply Zhejiang Chengyi American standard self-sealing gate valve

r, >When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing surface sealing, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, external force must be relied on to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface.
<:rr, , The gate plate of the gate valve moves linearly with the valve stem, which is called a lifting stem gate valve (also called a rising stem gate valve). Usually there is a trapezoidal thread on the lift rod, and through the nut on the top of the valve and the guide groove on the valve body, the rotational motion is changed into linear motion, that is, the operating torque is changed into the operating thrust.
<:rr, , When opening the valve, when the lift height of the gate plate is equal to : times of the valve diameter, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open, as its fully open position. In order to consider the locking phenomenon due to temperature changes, the valve is usually opened to the top position and then retracted/turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (that is, the stroke). Stainless steel gate valves, forged steel gate valves, flange gate valves, flange ball valves, and two-piece ball valves. In some gate valves, the valve stem nut is located on the gate plate. , the rotation of the handwheel drives the valve stem to rotate, which lifts the gate. This kind of valve is called a rotating rod gate valve or a concealed rod gate valve.