Pneumatic pneumatic - valve Reduced pressure pneumatic valve is introduced and the related knowledge

the reduced pressure pneumatic valve ( Reducingvalve is opening and closing of using pneumatic control valve body opening to regulate the flow of medium to 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 injection after pneumatic valve body or pneumatic valve of 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 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.
the reduced pressure pneumatic regulating pneumatic valve pneumatic valve is a necessary accessories, main effect is to air pressure decompression and stability to a fixed value, in order to adjust the pneumatic valve to obtain stable gas source power for regulating control.
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.
one, the basic properties of the reduced pressure pneumatic valve
( Regulating range: it refers to the reduced pressure pneumatic valve output pressure P adjustable range, meet the precision within the scope of this requirement. Regulating scope mainly related to pressure regulating spring stiffness.
( Pressure feature: it refers to the flow fixed value for g, caused by the input pressure fluctuation characteristics of the output pressure fluctuations. The smaller the output pressure fluctuation, the characteristics of vacuum pneumatic valve, the better. The output pressure must be less than the input pressure - Constant value was basically not changes over the input pressure.
( Flow feature: it refers to the input pressure - Timing, the output pressure changes along with the change of output flow g resistance. G when the flow changes, the output pressure changes as small as possible. Generally the lower the output pressure, which fluctuates according to the change of output flow.
2, the selection of vacuum pneumatic valve
in accordance with the requirements of using the selected decompression pneumatic valve type and voltage regulation accuracy, then choose the size according to the maximum output flow required. Decided to pneumatic valve of air pressure, should make it is greater than the highest output pressure. MPa。 Reduced pressure pneumatic valve is generally installed in the water gas filter, oil mist device or setter, and pay attention to answer against its import and export; Pneumatic valve should relax the knob when not in use, in order to avoid diaphragm often compression deformation and affect its performance.
3, reduced pressure of the pneumatic valve installation and maintenance should be paid attention to the following:
, convenient for operation and maintenance, the pneumatic valve usually upright installation in horizontal pipe runs.
, when installation should pay attention to the medium inside the pipeline flow and the pneumatic valve take is shown in the same direction of the arrow.
, in order to prevent the pneumatic valve after pressure to overpressure, pneumatic valve should be in the outlet of not less than M a reduced pressure pneumatic valve installation.
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