Gate valve is the closing member (gate) along the centerline of the vertical movement of the valve. Gate valve in the pipeline can only be fully open and all off with off, not for regulation and throttling. Gate valve is to use a wide range of valves, the general caliber DN ≥ 50mm cutting devices are used it, and sometimes a small caliber shut-off device is also used gate valve,
Electric stainless steel gate valve has two sealing surfaces, the most commonly used gate valve form two wedge sealing surface, wedge angle varies with the valve parameters, usually 50, medium temperature is not high, 2 ° 52 '. Wedge gate valve gate can be made as a whole, called the rigid gate; can also be made to produce a slight deformation of the gate, to improve its technology to make up for sealing surface angle in the process of deviation, this gate The board is called a flexible gate.
Gate valve is closed, the sealing surface can only rely on medium pressure to seal, that is, rely on media pressure to the sealing surface of the gate pressure to the other side of the valve seat to ensure that the sealing surface of the seal, which is self-sealing. Most of the gate valve is forced seal, that is, when the valve is closed, it must rely on external force to force the gate to the valve seat to ensure the sealing surface of the seal.
Gate valve gate with the stem for linear motion, called lifting rod gate valve (also known as rod gate valve). Trapezoidal thread is usually on the lifting rod, through the nut on the top of the valve product and the guide groove on the valve body, the rotary motion becomes a linear motion, that is, the operating torque becomes the operating thrust force.
When the valve is opened, the fluid path is completely clear when the ram height is equal to 1: 1 of the plumbing path, but this position can not be monitored during operation. The actual use is based on the top of the valve stem as a sign, that is, an open position, as its fully open position.
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