The dark bar gate is a gate opening and closing parts, RAM direction of motion perpendicular to the direction of the fluid, valve can only be fully open and fully closed, can not be adjusted and the throttle. The gate has two sealing surface, the most commonly used mode gate valve of the two sealing surface to form a wedge, wedge angle varies with the valve parameters, usually 50, medium temperature is not high to 2 degrees 52''''. Wedge gate valve can be made into a whole, called the rigid gate; can also be made to produce micro deformation of ram, in order to improve its process of deviation, make up the sealing surface angle in the process, the gate is called the flexible gate.
Dark bar gate valve is called the rotating rod gate valve (also called the dark bar wedge gate valve). The stem nut is located at the gate, the hand driven rotation of the valve rod, leaving gate to upgrade, with trapezoidal thread is usually in the stem of the bottom, the bottom end of the thread through the valve and the valve on the guide groove, the rotary motion into linear motion, which is the operating torque for operating thrust. When the valve is opened, when the gate height is equal to 1:1 times the diameter of the valve, the fluid passage is completely free, but at the time of operation, the position can not be monitored. Actual use, is the apex of the stem as a sign, that is, the open 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 open position, according to the location of the gate (that is, stroke) to determine.
Note: parameters are for reference only, or are not full. Valve can be used in accordance with the requirements of different pressure, material, diameter, drive, etc.. Specific please contact or online advisory contact.