When the valve is closed, the sealing surface can only rely on media pressure to seal, which rely on the sealing surface of the medium pressure to ram pressure to the other side of the seat to ensure the sealing surface, which is self-sealing. Most of the valve is sealed by force, that is, when the valve is closed, to rely on external pressure to force the gate valve seat wholesale dish to ensure tight seal faces. Gate valve with the valve stem linear movement, called the lift rod valve also called clear shot valve. Often movements are trapezoidal threaded rod through the top of the valve guides and valve nut on the rotary motion into linear motion, which is the operating torque thrust into action. Open the valve, when the gate valve lift height equal to the diameter of the 1: 1 times, the fluid channel completely smooth disc valves, but at runtime supply valve disc, this position is not monitored. Valve is a gate opening and closing pieces, the direction of movement of the fluid direction perpendicular to the gate, gate can only be fully open and fully closed, the door does not apply to vary both parameters can be closed to traffic in less demanding situations linear , you can adjust the flow rate. Just off valve because of its structural characteristics that make a large flow resistance, so the throttle a place requirements on the use of the valve a little more. In addition, the cut-off valve, whether formal or anti-loaded disc valve supply, at the opening and closing process is always a very laborious, and therefore can not do much, or not easy to open and close. In addition, there is a one-way shut-off valves and good sealing effect, so the working fluid to prevent backflow of the occasion, it also has its uses wholesale disc valves, disc valves, electromechanical England by City Electrical Equipment Co., Ltd. of England. England City Electrical Equipment Co., Ltd. (www.gdyinglun.com) strong, credible, hydraulic machinery and components industry in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead England into the brilliant electromechanical and you work for a better future!