Pressure reducing valve is by regulating, reduced the inlet pressure to a needed discharge pressure, and to rely on the energy of the medium itself, make the valve outlet pressure automatic remained stable. From fluid mechanics point of view, pressure reducing valve is a throttling element, local resistance to change that by changing the throttling area, change the kinetic energy of the flow velocity and fluid, different pressure loss, so as to achieve the goal of decompression. And then rely on the adjustment of the control and regulation system, make the valve after pressure fluctuations and spring force equilibrium, the valve after pressure constant within a certain error range. There are different kinds of pressure reducing valve is simple for you to introduce different pressure reducing valve works: 1, diaphragm pressure reducing valve used to directly export side pressure increases, the film upward movement, the valve opening is reduced, increased flow velocity, pressure drop, the Canadian valve after pressure decreases, and the export side pressure drop. Thin film downward movement, increase the valve opening, velocity decreases, and the pressure drop decreases, valve after pressure increased. After the valve outlet pressure keeps setting of constant pressure by adjusting the adjustable screw. 2, direct acting bellows type pressure reducing valve: the export side pressure increases, the upward movement of corrugated pipe, reducing valve, flow rate increases, the pressure drop, the Canadian valve after pressure decreases, and the export side pressure drop. Increase the downward movement of corrugated pipe, valve opening, velocity decreases, and the pressure drop decreases, valve after pressure increased. After the valve outlet pressure keeps setting of constant pressure by adjusting the adjustable screw. 3, the guide piston type pressure reducing valve: turn adjusting screw, the top channel valve disc, medium from the inlet side into the piston above, due to the piston area is greater than the main valve disc area, promote the piston moves down, the main valve opens, a valve pressure balance after adjust the spring pressure change pilot valve opening, so as to change the piston at the top of the pressure, to control the main valve opening, the valve after pressure constant. 4, the forerunner diaphragm pressure reducing valve when adjusting spring in a free state, the main valve and pilot valve are closed. Rotating the handwheel clockwise, pilot valve diaphragm downward channel valve, medium flow through the pilot valve to the above the diaphragm, so as to promote the main valve, make the main valve opens, media of exports, at the same time into the pilot valve beneath the diaphragm, the outlet pressure rise to and the spring force balance. Such as export pressure increased, pilot valve diaphragm is moving up, the pilot valve opening. At the same time to enter the main diaphragm below medium flow rate decreases, and pressure drop, outlet pressure lower reaches a new equilibrium. 5, combined type pressure reducing valve, pressure reducing valve by the main valve, pilot valve, cut-off valve. When adjusting spring in a free state, the main valve and pilot valve is closed. Turn adjusting screw, pushed by the media channel valve, at the same time to enter the main valve rubber film chamber 1 to adjust the spring pressure balance, to enter the main valve rubber film chamber 2, make the rubber diaphragm, upward to the flow direction of medium the main valve opens, exports ( The cut-off valve open, keep the chamber 2 certain pressure) 。 Export medium feedback to rubber film chamber 3 above and below the pilot valve chamber 4 when the outlet pressure increased, of the diaphragm of the pilot valve, pilot valve opening, the medium pressure chamber 1 drop, chamber pressure drop 2 at the same time, the main valve rubber film down, the opening of the main Industrial Valves is reduced, the outlet pressure drop, reaching a new equilibrium. Vice versa orbit ball valve 6, lever type pressure reducing valve when the hammer on the lever balance pressure reducing valve. Its action principle: when the lever is in a state of freedom, double seat disc and seat closed. Under the effect of inlet pressure, the upward push disc, outlet pressure, balance weight on the lever, adjust the important message to the desired outlet pressure. When the outlet pressure over a given pressure, the medium pressure compared to the force acting on the seat for the seat of his great strength, forming a differential pressure, the valve moves down, in order to reduce the area of throttling, outlet pressure drops, reaching a new equilibrium. 7 and vice versa, the forerunner of bellows type pressure reducing valve structure principle with the guide piston type pressure reducing valve.
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