Advantages and purpose There isn't water hammer. The sensitivity is high. Reasonably be controlled by the hydraulic pressure. Can use for long time.  For reliefing the pressure of the production systems of the mining enterprises and fire systems of the high buildings in, order to prevent the system failure caused by the too high hydraulic pressure. Can keep the water supply upper pressure of the main valve in a preset pressure to, ensure the pressure of upper supply zone of the main valve.  Standard and regulation Flange connection dimension: GB/T 17241.6-1998, GB/T 9113.1-2000  Nominal pressure: PN0.6MPa, PN1.0MPa, PN1.6MPa, PN2.5MPa Nominal diameter: Diaphragm type DN20-450mm, Piston type DN500-900mm Suitable medium: Water Suitable temperature: ≤80  Inspection and test: GB/T 13927, API598 Body material: Cast iron, Ductile cast iron, Carbon Steel, Stainless steel

Component list:1.Pilot valve 2.Needle valve 3.Ball valve 4.Main valve 5.Pressure gage
Main connection dimensions