Soft seal gate valves are divided intoFlush stem soft seal gate valveAnd dark rod soft seal gate valve two. Usually on the lifting rodTrapezoidal thread, through the middle of the gatenutAnd the guide groove on the valve body, which turns the rotation motion into linear motion, that is, the operating torque into the operating thrust. When the valve is opened, the height of the gate is equal to that of the valvesizeAt 1:1, the flow channel is completely free, but this position cannot be monitored during operation. In practice, it isThe valve stemAs the flag, that is, the unmovable position, as its fully open position. To account for temperature changes, locking occurs, usually at the top position, and then back to 1/2-1 turn, as the position of the fully open valve. Therefore, the full open position of the valve is determined by the position of the gate (stroke >). This kind of valve should be installed horizontally in the pipeline.