seal gate valves are generally of the elastic base seat of flange, flange connection, of course. Seal gate valves of the elastic base seat is also called the lifting lever gate valve ( Was also called gate valve) 。 Stem usually with trapezoidal thread of ascension. Through the valve body at the top of the nut and guide, make rotation movement into linear motion, namely work torque thrust into work. Open the valve, when the gate hoisting height is equal to the valve diameter was 1:1, port open completely, but at runtime, the position cannot be monitored. In practice, marked by the stem apex, that is, not moving the valve stem position as its full open position. In order to consider the temperature change of locking phenomenon, often open the valve to the vertex positions, and its inversion to 1/2 - 1 the location of the circle as a fully open valve. Therefore, the position of the valve in full open position by the gate ( The trip) Decision.

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