Overview of gate valve 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, is not suitable for adjusting and throttling. There are two gate sealing surface, the most popular wedge gate valve sealing surface to form two wedge, wedge angle with the valve parameters vary, usually 5o. 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. Gate valve with the valve stem with a straight line, called the lift rod valve (also called clear shot valve.) Often movements are trapezoidal threaded rod, nuts through the valve and the valve on the top of the guide slot, the rotary motion into linear motion, that is, the operation of torque, thrust into action. Some of the valve, the stem nut is located at the gate, hand-driven rotation of valve stem rotation, leaving the gate to upgrade, this valve is called the rotating rod valve or valve called the dark bar. Valve has the following advantages; 1. Fluid resistance, sealing surface by the media erosion and erosion. 2. Open and close more effort. 3. Medium flow unrestricted, non spoiler, do not reduce the pressure. 4. A simple shape, structure, length short, good manufacturing processes for a wide range. 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, gate-type double plate and elastic; parallel to the gate Plate gate valve can be divided into single-and double plate. Position by the valve stem threads are divided into clear shot valve and the dark bar gate two. Valve products of the Company are: wedge gate valve, knife gate valve, resilient seated gate valve, JIS JIS, ANSI American Standard valve, jacketed insulation valve, slurry valve, forged steel valve, flat gate valve , dark bar valve, vacuum valve and other products. Nominal pressure or stress level: PN1.0-16.0MPa, ANSICLASS150-300LB, JIS10-20K nominal diameter or caliber: DN10 ~ 1000, NPS1 / 2 ~ 36 "Connection: flange, butt welding, thread, etc. Temperature: -196 ℃ ~ 700 ℃ Drive Mode: Manual, bevel gear, pneumatic, electric, hydraulic, Pneumatic-hydraulic, electro-hydraulic linkage Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. use of different materials, can be separately applied to water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.