Gate (gate valve) is the gate opening and closing parts, the direction of movement of the fluid direction perpendicular to the gate, gate can only be fully open and fully closed, can not be adjusted and the throttle. Ram has two sealing surface, the two most common mode of sealing surface to form a wedge gate valve, wedge angle with the valve parameters vary, usually 50, the medium temperature is not high for 2 ° 52 '. Wedge gate valve can be made into a whole, called the rigid gate; can also be made to produce small quantities of deformation gate in order to improve its process, to make up the sealing surface angle deviations arising during processing, this gate board called the flexible gate. Stainless steel gate valve material is divided into 304, 316 stainless steel valve, 321 stainless steel valve. Representation for: Z41H-16P. Types of stainless steel gate valve, 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 plate and flexible gate type; parallel gate-type valve can be divided into single-gate type and double plate. Divided by the threaded stem position can be divided into two clear shot valve gate and dark bar. This type valve in the pipe should generally be installed horizontally. When the structure of stainless steel valve open the valve, when the gate valve lift height equal to diameter of 1: 1 times, the fluid channel is completely smooth, but at run time, this position is not monitored. Actual use, is the apex of the stem as a sign 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 position of the valve fully open. Therefore, the fully open position of the valve, according to gate position (ie, travel> to determine. Some valve stem nut located at the gate, handwheel drive stem rotation, leaving the gate to upgrade, this valve called the rotating rod valve or valve called the dark bar. The gate valve with the valve stem linear movement, called the lift rod valve (also called clear shot valve). Often movements are trapezoidal threaded rod through the top of the nut and valve guides on the body, the rotary motion into linear motion, which is the operating torque thrust into action. sealing surface can only rely on media pressure to seal, which rely on media pressure to ram pressure to the sealing surface of another side seat to ensure sealing surface, which is self-sealing. Most of the valve is sealed by force, that the valve is closed, to rely on external pressure to force the gate valve to ensure tight seal faces. 1, selected materials, in line with domestic and international standards, high overall quality of the material. 2, in line with the requirements of domestic and foreign advanced standards, reliable sealing, excellent performance, attractive appearance 3. Sealing pair advanced and reasonable, gate and seat sealing surface with different hardness Stellite (Stellite) cobalt-based alloy cladding made of reliable sealing, high hardness, wear resistance, high temperature resistance, corrosion resistance, good anti-abrasion performance and long life. 4, stem quenched and surface nitriding treatment, good corrosion resistance, scratch resistance and abrasion resistance. 5, the use of flexible wedge gate structure, medium and large caliber set of thrust bearings, friction force is small, and with a crash manually open and close with ease.