Hydraulic pressure reducing valve: Also known as reduced pressure regulator valve) Piston type pressure reducing valve and diaphragm type pressure reducing valve two kinds. Piston type pressure reducing valve is a complex and changeable conditions can be self adjusting valve regulated by hydraulic valve, at the time of inlet pressure and flow change keep stable outlet pressure and flow rate. The realization of self control, debugging is simple, reliable operation. Hydraulic pressure reducing valve is an essential part of hydropower station unit a safety equipment, pressure reducing valve manufacturer small make up today say to everyone choose the basic knowledge of pressure reducing valve:

1, the spring pressure level at a given range, between the outlet pressure on the big value and small, can adjust continuously must not have jam and abnormal vibration;

2, for soft sealing pressure reducing valve, within the prescribed period of time can not have leakage. For metal sealing Industrial Valves, the leakage should be not more than large flow rate of 0. 5%;

3, outlet flow changes, direct acting type of outlet pressure deviation is not more than 20%, guiding type is not more than 10%;

4, inlet pressure changes, direct acting type of outlet pressure deviation is not more than 10%, the forerunner of not greater than 5%;

5, usually, the pressure reducing valve valve after the zero pressure should be less than the former. 5 times;

6, a wide range of application of the pressure reducing valve, the industrial steam, compressed air, gas, water, oil, and many other liquid medium is applicable to equipment and piping, the quantity of medium flows through the valve outlet, usually expressed in mass flow rate or volumetric flow;

7, corrugated pipe direct acting type pressure reducing valve is suitable for low voltage, small and medium caliber steam medium;

8, film in the direct acting type pressure reducing valve is suitable for low pressure, medium and small size of air and water;

9, the guide piston type pressure reducing valve, suitable for all kinds of pressure, all kinds of caliber, all kinds of medium temperature of steam, air and water, if use stainless acid-resistant steel manufacturing, can be applied to all kinds of corrosive medium.

10, the forerunner of bellows type pressure reducing valve, suitable for low voltage, small and medium caliber media such as steam, air,

11, the forerunner diaphragm pressure reducing valve, suitable for low pressure, medium pressure, small and medium caliber media such as steam or water;

12, pressure reducing valve inlet pressure fluctuations should be controlled in 80% ~ 105% of inlet pressure set value, such as more than the scope, the relief of performance will be affected;

13, usually after the valve of the pressure reducing valve before pressure should be less than the pressure of 0. 5 times;

14, each leg of the pressure reducing valve spring applies only within a certain range of outlet pressure, beyond the scope of spring should be changed;

15, to work in the medium temperature is higher, generally choose the guide piston type pressure reducing valve or pilot bellows type pressure reducing valve;

16, medium for air or water, Liquid) Occasions, general appropriate chooses direct action film type pressure reducing valve or pilot diaphragm pressure reducing valve;

17, medium for steam, appropriate chooses the guide piston or pilot bellows type pressure reducing valve;

18, convenient for operation, adjustment and maintenance, pressure reducing valve should be installed in horizontal pipe runs in general.

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