Balance sleeve reduced pressure pneumatic valve (4)

two-stage throttling balance sleeve reduced pressure pneumatic valve has many advantages: (1) can achieve two throttling, so as to solve the high pressure drop cases decompression topic, slows down the hydraulic impact, to avoid the cavitation occurrence, reduces the noise, can also be adapted to the low pressure drop of the reduced pressure. (2) through the simple structure design, making the pneumatic disc in the balance of horizontal direction at the same time, also keep a good balance in vertical direction, reduces the design and manufacture of capital. (3) lateral thrust balance, pneumatic valve guide is smooth, pneumatic seat joint face life growth, reasonable structure optimization. (4) pneumatic disc can quickly remove, maintenance. (5) elastic element corresponding to the outlet pressure of the secondary throttling only can progress not disorderly of reduced pressure pneumatic valve outlet pressure.
the reduced pressure pneumatic valve is a kind of self-reliance type pneumatic valves, regulating it by pneumatic trims throttling, the inlet pressure drop to the required outlet pressure. When the inlet pressure and flow rate changes, with the aid of elastic element and the strength of the medium itself keep the outlet pressure constant. Map decompression is widely used in the pneumatic valve is commonly primary throttling, pneumatic disc for cone. Primary throttling decompression of pneumatic valve has good using effect in low pressure lowered, but in high pressure drop produce angry easily corrosion lead to throttle a premature failure. So often is two or more reduced pressure pneumatic valves used in parallel, to increase the system the operation of the capital and not not disorderly. Decompression subject in order to solve the high pressure, we design a two-stage throttling balance sleeve reduced pressure pneumatic valve. Reduced pressure pneumatic valve in the form of the structure direct action film type, direct acting bellows type, the forerunner diaphragm, the forerunner of corrugated tube and the guide piston, etc. No matter what kind of structure form, are automatically by the elastic element balance medium pressure to adjust the opening of pneumatic valve throttling decompression, including pneumatic valve is the most core decompression pneumatic valve parts, its design is reasonable or not directly affects the stress function of the use of pneumatic valve. Reduced pressure pneumatic valve pneumatic disc structure of two level balance sleeve throttling sleeve pneumatic disc in the middle of a ring of the same orifice area and to the uniform distribution, as primary throttling mouth. Sleeve type pneumatic valve disc, the department each a ring of the same orifice area and to the uniform distribution, for the second orifice. Medium from the reduced pressure pneumatic valve inlet end by pneumatic disc in the middle of a throttling orifice level after entering the pneumatic disc tubular space, because of the tubular space, the area under the same, upper and lower casing liquid under pressure offset balance, thus throttling area is not affected by inlet pressure change, medium by pneumatic disc again after the upper and lower secondary throttle orifice into the vacuum pneumatic valve outlet. The area of the upper and lower two level orifice and middle level of the total area of the orifice are the same, two-stage throttling pressure close, namely vacuum pneumatic valve throttle pressure always basic uniform distribution, control the flow velocity. Top, middle and under each an orifice ring to the uniform arrangement, eliminating the side force.