gas valves valve: Pilot valve

When the high pressure gas valve output diameter or larger, with a direct regulator regulator spring, the spring stiffness necessarily too large, flow changes, the output pressure hydraulic cutting machine fluctuations, the structure will also increase the size of the valve . To overcome these shortcomings, can be pilot valve. basically the same gas valves pilot valve works with direct-acting. pilot valves used is determined by a small direct-acting valve sealing fitting supply. If the small direct acting pressure reducing valve mounted inside the body, it is called an internal pilot valve; If small direct acting pressure reducing pilot operated safety valve installed in the main body outside, then called external pilot valve . Compared with the bsp thread fittings direct-acting valve, the valve is increased by the nozzle 4, 9 and fixed orifice baffle chamber consisting of a nozzle flapper B amplification link. When the distance between the nozzle and the baffle when small changes, it will cause pressure in the chamber B significant changes roots occur, thus causing the diaphragm 10 has a larger displacement, to control the vertical movement of the spool 6, the inlet 8 large or open valve port off small, to improve the sensitivity control on the spool, which improves the regulation accuracy....