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Gate Valve types, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Double Gate Plate and flexible gate-type; parallel gate-type valve can be divided into single-ram type and double plate. Position by the valve stem threads are divided into clear and dark bar bar gate valve two. Valve closed, sealing surface can only rely on media pressure to seal, that only rely on media pressure to ram pressure to the other side of the sealing surface of the valve 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. The gate valve with the valve stem with a straight line, the name (also called clear shot valve). Usually in the lift rod with trapezoidal thread, through the valve body on top of the nut and the guide groove, the rotary motion into linear motion, that is, the operation of torque thrust into action. Open the valve, when the gate valve lift height is equal to 1:1 times the diameter, the fluid channel completely smooth, but at run time, this position is not monitored. Actual use, is the culmination of the stem as a symbol, which means that the fixed position, as its fully open position. Temperature appears to consider locking phenomenon, usually open to the vertex position, and then rewind 1/2-1 circle, as the fully open valve position. Therefore, the valve fully open position, according to gate position (ie, travel> to determine. Some valve, located in the ram on the stem nut, hand-driven wheel rotating valve stem rotation, Er Shi ram upgrade, this valve is called the rotating rod valve or valve called the dark bar. Domestic production gate valve manufacturers are more connected mostly non-uniform size. Mainly consists of the following categories: To JB/T2203-1999 "gate structure length"-based utility category. Currently most of the safety valve manufacturer designed and manufactured in accordance with this standard. Manual valve works: Handwheel handwheel and the valve stem through the thread forward, back, raise or lower the valve plate and valve connections, to the role of open and closed. By shell / main material categories, valve can be divided into: 1. Metal Valves: valves, such as carbon steel, alloy steel valves, stainless steel valves, cast iron valves, titanium valves, Monel valves, copper alloy valves, aluminum valves, lead alloy valve and so on. 2. Metal valve body lining: If rubber lined valves, valve fluorine, lead lined valves, lined valves, valves lining enamel. 3. Non-metallic material valve: the valve, such as ceramics, glass valve, plastic valve.