According to the sealing surface configuration can be divided into wedge gate-type valve and gate valve, wedge gate-type valve can be divided into: single gate type, dual gate plate and elastic wedge type; parallel gate-type valve can be divided into single-ram type and double plate. By the valve stem thread position division, may divide into the bright and dark bar bar gate valve two. Valve closed, sealing surface can only rely on medium pressure to seal, which rely on medium pressure of the gate sealing surface pressure to the other side of the seat to ensure the sealing surface of the seal, which is a self sealing. Most of the valve is sealed by force, that the valve is closed, to rely on external pressure to force the gate to the seat, to ensure the sealing surface of the seal. Gate valve with the valve stem with a straight line, called the lift rod valve ( also called clear shot valve ). Usually in the lift are trapezoidal threaded rod, through the valve top nut and body guide groove, the rotary motion into linear motion, i.e. the operation torque, thrust into action. When the valve is opened, when the gate valve lift height is equal to size of 1:1 times, fluid in the channel completely, but at runtime, this position is unable to monitor. In practical use, is stem vertex as a symbol, i.e. open fixed position, as its full open position. Temperature changes appear to consider locking phenomenon, usually open to the vertex position, then back to1/2 1ring, as a fully open valve position. Therefore, the valve to open position, press the gate position (i.e. stroke > to determine. Stainless steel valve, forged steel valve, gate valve, ball, two ball valve or gate, located in gate valve stem nut, the hand wheel rotation to drive the valve rod, and the gate lifting, this valve is called the rotating rod gate valve or rising stem gate valve.

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