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Gate Valve

Gate Valve

Summary of Gate Valve 

Gate valve is a gate with opening and closing parts. The moving direction of the gate valve is perpendicular to the direction of the fluid. the gate valve can only be fully opened and closed. The parameters of the gate valve are different, usually 5 degrees. When the medium temperature is not high, it is 2 degrees 52'. Improve its technicality and make up for the deviation caused by the angle of sealing surface in the process of processing. This kind of gate is called the elastic gate.
Working principle
 
Gate valve's opening and closing parts are gates, whose moving direction is perpendicular to the direction of the fluid. the gate valve can only be fully opened and closed, and can not be adjusted and throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valves form wedges. The wedge angle varies with the valve parameters, usually 5 degrees, and the medium temperature is 2 degrees 52'. Wedge gate valve gate can be made into a whole, called rigid gate; it can also be made into a gate which can produce slight deformation to improve its workability and make up for the deviation of sealing surface angle in the process of processing. This kind of gate is called the elastic gate. When gate valve closes, the sealing surface can be sealed only by the medium pressure, that is to say, the sealing surface of the gate can be pressed to the seat on the other side to ensure the sealing surface, which is self-sealing. Most gate valves are forced to seal, that is, when the valve closes, the gate must be forced to the seat by an external force to ensure the sealing of the sealing surface. Gate valve's gate moves in a straight line with the stem. It is called the lift gate valve, or open gate valve. Usually, there are trapezoidal threads on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is to say, the operating torque is changed into the operating thrust. When opening the valve, when the gate lifting height is equal to 1:1 time the valve diameter, the flow passage is completely open, but when running, this position can not be monitored. In practical use, the vertex of the valve stem is used as the sign, that is, the position of the valve stem that is not moving is used as its fully open position. To consider the locking phenomenon of temperature change, the valve is usually opened to the vertex position and reversed to 1/2-1 turn as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate, that is, the stroke. Some gate valves, stem nuts set on the gate plate, hand wheel rotation to drive the rotation of the valve stem, and make the gate lift, this valve is called rotary bar gate valve, or hidden bar gate valve.


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