Stainless steel gate valve opening and closing pieces are, ram direction of motion perpendicular to the direction of the fluid, the valve can only be fully open and fully closed, can not be adjusted and cut expenditure. There are two gate sealing surface, the most common mode of gate valve sealing surface to form two wedge, wedge angle with the valve parameters vary, usually 50, the medium temperature is not high when 2 ° 52''''. Wedge gate valve can be made into a whole, called rigid gate; also be made to produce small deformation gate in order to improve its process, make up the sealing surface angle deviations arising during processing, which gate is called the flexible gate. 
 Valve closed, the sealing surface can only rely on media pressure to seal, in which the medium pressure to ram pressure to the other side of the sealing surface of the seat to ensure the sealing surface of the seal, 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 to the seat in order to ensure the sealing surface of the seal.