Gate valve with the valve stem with a straight line, called (also
called clear shot valve.) Often movements are trapezoidal threaded rod,
nuts through the valve and the valve on the top of the guide slot, the
rotary motion into linear motion, that is, the operation of torque,
thrust into action.

Open the valve, when the gate valve lift height is equal to 1:1 times the diameter, the fluid channel
completely smooth, but at run time, this position is not monitored.
Actual use based on the apex of stem as a sign that the fixed position,
as its fully open position. Temperature changes appear to consider
locking phenomenon, usually open to the vertex position, and then
rewind 1/2-1 circle, as a fully open valve position. Therefore, the
valve fully opens position, according to damper position (that is, the
process "to determine.

Some valve, the stem nut is located at the gate, hand-driven rotation
of valve stem rotation, leaving the gate to upgrade; this valve is
called the rotating rod valve or valve called the dark bar.

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