What are the motion modes of the gate valve

Movement mode: the gate valve and the seat of the straight line movement, also known as the rod gate valve. Usually, elevator rods have trapezoidal threads. According to the Nut at the top of the valve and the guide grooves in the body, the rotational motion becomes straight, that is, the operating torque becomes the operating thrust.When the valve is opened and the lift height of the gate is equal to 1:1 times the diameter of the valve, the flow passage is completely clear, but it is difficult to monitor during operation.  In practice, the end of the seat should be marked, that is, the position that cannot be opened as the full open position. In order to account for the locking phenomenon of temperature changes, it is usually adjusted to the end position and then RE wound 1/2-1 turn as the full open valve position.  Therefore, the fully open position of the valve should be determined according to the gate position (i.e., stroke) >.  Some gate valve nuts are set on the gate and the hand wheel rotates to push the SEAT around and then raise the gate.  These valves are called rotary stem gate valves or dark stem gate valves.