Reducing pneumatic valve structure classification, reducing working principle of the pneumatic valve, pneumatic valve decompression decompression process how?

is reduced pressure pneumatic valve adopts pneumatic control valve body of the opening of the opening and closing of regulating the flow of medium, the medium pressure is reduced, at the same time with the aid of the role of the pneumatic valve after pressure adjust the opening of open-close part, keep the pneumatic valve after pressure within a certain range, and the spray after pneumatic valve body or pneumatic valve into the cooling water, reduce the temperature of medium, the pneumatic valve is called decompression desuperheating pneumatic valve. The characteristics of the pneumatic valve, is under the condition of the inlet pressure changing, keep exports to pressure and temperature in a certain range.
the reduced pressure pneumatic valve is widely used in high-rise buildings, the area of urban water supply pipe network pressure is too high, mines and other occasions, to ensure that each water point in water supply system water pressure and flow to have the appropriate services. In view of water leak rate and degree of waste almost as the water pressure is directly proportional to the size of feed water system, thus reduced pressure pneumatic valve have improve system operation condition and potential water-saving effect, according to statistics, the water saving effects about %.
the structure of the reduced pressure pneumatic valve type many, common in the past have a spring in the diaphragm, piston, etc. Reduced pressure pneumatic valve's basic principle is to rely on pneumatic valve port on the local resistance to reduce the water pressure, water pressure drop by connecting the range of pneumatic disc membrane or the import and export pressure difference on both sides of the piston automatic adjustment. In recent years appeared some new type of vacuum pneumatic valve, such as constant ratio type pneumatic valve to relieve stress. Constant ratio reduced pressure principle is to use the floating piston in the hydraulic pneumatic valve body ratio control, import and export side pressure ratio is inversely proportional to the import and export side piston area ratio. The reduced pressure pneumatic valve work smoothly without vibration; Pneumatic valve body without spring, so no spring corrosion, metal fatigue failure were evident; Good sealing performance, leakage and dynamic pressure reduction (both The water flow and static pressure reduction ( Traffic too; Especially in relief at the same time does not affect the water flow. MPa, the pressure regulating range of error is + / - % ~ %.
the reduced pressure pneumatic valve structure classification
the reduced pressure pneumatic valve can be divided into the form of the structure diaphragm, diaphragm spring, piston, lever and bellows type; According to the pneumatic seat number can be artificial single-seat type and two-seater type; According to the position of the pneumatic disc different can be divided into positive action and reaction type.
, direct acting diaphragm pressure pneumatic valve working principle of the

the export side pressure increases, the film upward movement, the pneumatic valve opening decreases, and the velocity increases, the pressure drop increases, pneumatic valve after pressure decreases, and the export side pressure drop. Film downward movement, the increase of the pneumatic valve opening, the flow velocity decreases, and the pressure drop decreases, pneumatic valve after pressure increased. Pneumatic valve outlet pressure always stay after setting of the constant pressure by adjusting the adjustable screw,
the guide piston vacuum pneumatic valve working principle

turn adjusting screw, the top channel pneumatic valve pneumatic disc, medium from the inlet side into the piston above, due to the piston area is greater than the area of main pneumatic disc, forces the pistons to move down, make the pneumatic valve is opened, a pneumatic valve pressure balance after adjust the spring pressure change the guide of the pneumatic valve opening, so as to change the piston at the top of the pressure, to control the main pneumatic valve opening, the pneumatic valve after pressure constant,
the forerunner diaphragm vacuum pneumatic valve working principle of the

when adjusting spring in a free state, the pneumatic valve and pneumatic valve is closed. Clockwise rotate the handwheel, pneumatic valve, pneumatic diaphragm valve top down channel guide medium through pneumatic valve flow guide to the above the diaphragm, pushing the main pneumatic valve, make the main pneumatic valve open, medium of exports, at the same time into the lead down to the bottom of the pneumatic diaphragm valve, outlet pressure rise to maintain a balance with the adjustable spring force. As exports increased pressure, pneumatic diaphragm valve guide is moving up, guide the pneumatic valve opening. At the same time to enter the main diaphragm below medium flow rate decreases, and pressure drop, outlet pressure lower reaching a new equilibrium, and vice versa,
combined vacuum pneumatic valve working principle of the

vacuum pneumatic valve, pneumatic valve by the main guide of pneumatic valve, by the pneumatic valve. When adjusting spring in a free state, the pneumatic valve and pneumatic valve is closed. Turn adjusting screw, pushed by the media channel, pneumatic valve, pneumatic valve rubber at the same time into the main film chamber and adjust the spring pressure balance, into the main chamber pneumatic valve rubber film, make the rubber diaphragm upward, the flow direction of medium main pneumatic valve opens, exports ( At this point by the pneumatic valve open, keep the chamber pressure. Export medium and feedback to the upper chamber rubber film and guide below the pneumatic valve chamber when the outlet pressure increased, guide of the diaphragm of the pneumatic valve, pneumatic valve guide opening decreases, the chamber of the medium pressure drop, chamber pressure drop at the same time, the pneumatic valve rubber film down, the main opening of pneumatic valve is reduced, the outlet pressure drop, reaching a new equilibrium. And vice versa,
lever decompression working principle of the pneumatic valve

the counterweight balance pressure on the lever of pneumatic valve to relieve stress. Its action principle: when the lever is in a state of freedom, and pneumatic double pneumatic seat of pneumatic valve seat valve in the closed state. Under the effect of inlet pressure, the upward push pneumatic 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, due to the medium pressure acting on the aerodynamic force on the seat to used for the aerodynamic force on the seat, form a certain differential pressure, pneumatic disc moves down, in order to reduce the area of throttling, outlet pressure drops, reaching a new equilibrium. And vice versa,
the forerunner bellows type pressure pneumatic valve working principle of the

structure theory with the guide piston vacuum pneumatic valve