Description of the movement mode of the vacuum butterfly valve

Vacuum butterfly valve movement

The gate of the gate valve moves linearly with the valve stem, also known as the open gate valve. Usually, trapezoidal threads are provided on the lifting rod, and the rotation is made linear by the valve nut and the guide groove on the valve body, that is, the operating torque is changed to the operating thrust.

When the valve is opened, when the lifting height of the gate is equal to 1:1 times the diameter of the valve, the passage of the fluid is unblocked, but this position cannot be monitored during operation.

In actual use, the apex of the valve stem is used as a mark, that is, the position where the valve is opened, as its fully open position. In order to consider the temperature change, there is a lock-up phenomenon, usually at the position of the opening to the apex, and then back to 1/2-1 lap as the position of the fully open valve.

Therefore, the full open position of the valve is determined according to the position of the gate (ie, stroke). Some gate valve stem nut is set on the gate, and the rotation of the hand wheel drives the valve stem to rotate, so that the gate is lifted. Rotary lever gate valve or dark rod gate valve.