The use of the water pressure test of pneumatic valve

plugging pneumatic valve is a kind of form a complete set of power plant boiler commonly used pneumatic valve, one of the main structure form has wall plate and worm gear transmission frame type. At present, the domestic is fully able to MW subcritical, supercritical and ultra supercritical units under complete production this kind of hydraulic pressure test of pneumatic valve. MW below the unit has been basically achieve localization, through years of operation, use in good condition. Using method of hydrostatic test pneumatic valve plate hydrostatic test pneumatic valve ( Also referred to as blocking pneumatic valve is typically used in the thermal power factory steam pipe and reheat steam pipe, as a boiler, superheater, main steam pipe and reheat device and reheat pipe when the water pressure test isolation device. After water pressure test, pneumatic valve can be used as a channel on the pipe wall. Blocking pneumatic valve is a kind of form a complete set of power plant boiler commonly used pneumatic valve, one of the main structure form has wall plate and worm gear transmission frame type. At present, the domestic is fully able to MW subcritical, supercritical and ultra supercritical units under complete production this kind of hydraulic pressure test of pneumatic valve. MW below the unit has been basically achieve localization, through years of operation, use in good condition. Hydrostatic test pneumatic valve structure wall plate: hydrostatic test pneumatic valve by pneumatic valve, pneumatic valve cover, sealing ring, four ring opening, test boards, support plate, screw and nozzle, etc, the specific structure and the working state. Pipe test condition, supporting plate and the internal boards installed in the pneumatic valve, tighten the screw, the boards to produce certain initial seal between the sealing surface pressure, the flow direction of medium blocking the export side, medium pressure between the boards and pneumatic valve sealing surface produce enough sealing pressure, regardless of pipeline test medium pressure high and low, all can ensure the seal, meet to test support plate on one side of the pipe. End of the test, remove the boards, installation of nozzle and pneumatic valve cover, etc. , as a pneumatic valve pipe at this time. Test again, still in for the boards. Boards to the sealing surface material can adopt stainless steel, hard alloy, or o-ring, lumen sealing ring can be used to enhance flexible graphite or metal sealing ring internal pressure since the seal structure. Wall plate is similar to a normal use pneumatic valve pipe, pneumatic valve flow resistance can be ignored, the unit thermal efficiency does not have any effect. Remove the pneumatic valve cover test is weakness, sealing ring, etc, takes work, easy to damage the sealing ring especially metal sealing ring, need to have spare parts. Worm gear type: turning worm wheel transmission frame type hydraulic test pneumatic valve by pneumatic valve, pneumatic valve seat, valve cover, sealing ring, four ring opening, pneumatic valve, rocker and worm gear drive, etc. When pipe test, turn the worm gear drive wheel, to turn over to the closed position, the valve flap of pneumatic pressure and produce certain preload, medium later by medium pressure to achieve high pressure seal, meet the piping test. After test, to flip to the lowest position, pneumatic disc does not affect the normal flow of work medium. Wall plate and frame structure has obvious advantages and disadvantages. Flap type pneumatic valve has the advantage of test do not need to disassemble parts, just turn the handwheel of the worm gear device, save work opening and closing time, its disadvantage is that will produce a certain fluid resistance, pneumatic valve body lumen approximate square cross-section at the same time, guarantee the high voltage test pneumatic valve body has enough rigidity, it must increase pneumatic valve body lumen wall thickness or add reinforcement. Pneumatic valve flap type plugging compared with wall plate plugging pneumatic valve flow resistance is big, cause energy waste, but has little effect on the unit efficiency. http://www pneumatic pneumatic valve manufacturer. /。