Flat gate valve purposes: flat gate valve for natural gas, petroleum, chemical, environmental protection, urban pipelines, gas pipelines and other pipeline, venting system and steam storage device, used as hoist equipment. Z43 single gate with diversion gate plate valve for natural gas extraction and purification of long-distance pipeline. Flat gate valve Diameter range: DN25 ~ 1200 Pressure range: 0.6MPa ~ 45MPa 150Lb ~ 3000Lb Diversion orifice plate gate valve for the need for the ball through the pipeline, no diversion hole for the pipe does not require the ball through the pipe. Characteristics of flat gate valve: 1, the sealing structure of the valve seat should be elastic pre-tightening, upstream and downstream seals at the same time sealed structure. Seat and seal are always face-to-face seals. 2, the seat has a self-cleaning function, and the valve is not open or closed during the direct flow of air erosion. Seat should be made of lubricated, non-abrasive material. 3, the valve actuator failure does not affect the rest of the valve, maintenance and replacement work can be carried out without removing the valve. (1) Yoke Sleeve - The aluminum bronze yoke sleeve is equipped with a needle thrust bearing to minimize operating torque. (2) Stem - thread length up to bracket; pin and spot welding; stable. (3) Pressure Sealed - Simple to assemble, with sectional buckle and silver-plated mild steel washers to help disassemble and achieve the best bonnet seal. (4) Seat Ring - Welded seat ring is perpendicular to the flow path for easy maintenance. (5) Actuators - These valves can be equipped with electric, hydraulic or pneumatic actuators. DN300 following the standard configuration handwheel, DN350 above configuration helical gear operating mechanism. (6) Yoke - The fully assembled yoke passes the seismic test for easy maintenance and installation of the actuator. (7) Gland - Two-piece, self-adjusting gland to avoid being ejected. (8) overall rear seat - hard surface, the longest service life. (9) Flap - The spring-loaded flap regulates itself to reduce actuator torque demand. (10) The overall stop - the overall casting bracket stopper device, positioning the assembly of the bracket valve, making the valve seat more stable and reliable. 4, the valve body has two structures of casting and welding. 5, the seat with O-ring seal and the preload force applied to the floating valve seat structure, so that the two-way valve inlet and outlet seal; and the structure of the opening and closing torque only ordinary valve 1/2, to easily open, valve. 6, metal to metal seal valve, the body has a grease injection structure, grease through the grease, valve seat into the valve sealing surface, the valve to zero leakage. 7, the seat with PTFE seal on the surface, with PTFE pairs of metal and metal to metal seal, PTFE sealing surface at the same time remove the role of the gate dirt. 8, the gate, valve seat by a special process, spray welding carbide, wear-resistant PTFE, to achieve double seal. And grease-assisted double seal oil seal, seal more reliable, longer service life. 9, with diversion hole valve gate, whether it is fully open or fully closed with the sealing surface is always consistent with the sealing surface to be protected from direct erosion of the media, thereby extending the service life. 10, the valve is fully open, the channel is smooth to a straight line, the flow resistance coefficient is minimal, no pressure loss, can pass the hair ball cleaning pipeline. 11, The valve adopts self-sealing packing structure, without frequent adjustment, open and close extremely light, and the sealing is reliable, the stuffing box is equipped with an auxiliary seal grease injection structure, the sealing performance is absolutely reliable, and truly achieve zero leakage; General valve packing at the most easy to leak the ills. 12, when the valve is closed, the lumen pressure can be automatically removed to ensure safe operation. 13, fully enclosed structure, protective performance, can adapt to all-weather requirements. 14, the valve has a rod or observation window to indicate the valve opening and closing situation.