What is a gate valve? What is his function?

Gate valve is an opening and closing member gate, the direction of movement of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully open and fully closed, not for regulation and throttling. The gate valve is sealed by contact between the valve seat and the gate plate, usually the sealing surface will be welded metal materials to increase wear resistance, such as welded 1Cr13, STL6, stainless steel, etc.. There are rigid gate and resilient gate, according to the gate, the gate valve is divided into rigid gate and resilient gate valve. It is widely used in chemical, petroleum, light industry, hospital, environmental protection and other fields.

Working principle:

Gate valve opening and closing member is the gate, the direction of movement of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully open and fully closed, not for regulation and throttling. Gate has two sealing surfaces, the most commonly used mode gate valve two sealing surfaces form a wedge, wedge angle varies with the parameters of the valve, usually 5 °, the medium temperature is not high when 2 ° 52 '. Wedge gate valve gate can be made into a whole, called rigid gate; can also be made into a gate that can produce a micro-deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle generated during processing, this gate is called a resilient gate. When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, rely on the medium pressure to the sealing surface of the gate plate to the other side of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of the gate valves are forced to seal, that is, when the valve is closed, rely on external force to force the gate plate to the valve seat to ensure the sealing surface sealing. The gate valve with the gate plate along with the stem for linear movement is called the lift rod gate valve, also called the bright rod gate valve. Usually there are trapezoidal threads on the lift rod, and the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust, by the nut on the top of the valve and the guide groove on the valve body. When the valve is opened, the passage of fluid is completely open when the gate is lifted to a height equal to 1:1 times the valve's passage diameter, but this position cannot be monitored during operation. In actual use, the top point of the valve stem is used as a marker, i.e., the position of open immobility, as its fully open position. In order to consider the locking phenomenon of temperature change, it is usually opened to the apex position and then reversed 1/2-1 turn as the fully open valve position. Therefore, the valve's fully open position, according to the position of the gate plate that is the stroke to determine. Some gate valves, the stem nut is located on the gate, the handwheel rotation drives the stem rotation, while the gate is lifted, this valve is called a rotary rod gate valve, or concealed rod gate valve. Movement way gate valve closed, the sealing surface can only rely on media pressure to seal, that is, only rely on media pressure to the sealing surface of the gate plate to the other side of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of the gate valves are forced to seal, that is, when the valve is closed, rely on external force to force the gate plate to the seat to ensure the sealing surface of the seal.

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