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The Pressure Reducing Valve is a hydraulic self-operated control valve used for pipeline pressure regulation. It is widely installed in water supply & drainage, fire protection and high-rise building piping systems. It automatically reduces and stabilizes high inlet pressure to a preset lower outlet pressure via the pilot valve. It runs purely by medium pressure and needs no external power supply. It has quick response, stable outlet pressure, wide adjustment range, low pressure loss and easy maintenance, ideal for constant pressure control of domestic water, fire protection and industrial water pipelines.
This valve set includes main valve, pilot valve, filter, needle valve and connecting piping. It detects downstream pressure variation by the pilot assembly, and drives the main valve diaphragm with water pressure difference to adjust the opening. No extra power is required.
Pressure reducing function: It automatically reduces unstable high inlet pressure to steady preset outlet pressure. It keeps downstream pressure constant even if upstream pressure or flow fluctuates, to protect downstream pipes, fittings and water equipment from high-pressure damage.
Pressure stabilizing function: It maintains the set outlet pressure continuously under normal working conditions, guaranteeing stable water supply for terminal users and fire fighting facilities.
With optimized internal flow channel design, the valve features small flow resistance, reliable operation and long service life.
Attribute Name | Attribute Value |
|---|---|
Product Name | Pilot-operated Diaphragm Type Pressure Reducing Valve |
Valve Type | Hydraulic Control Pressure Regulating Valve |
Connection Type | Flanged End |
Applicable Medium | Clean Water / Fire-fighting Water |
Nominal Pressure Rating | 300 psi (PN 16 equivalent) |
Available Nominal Sizes | DN50 / DN65 / DN80 / DN100 / DN150 / DN200 (2" / 2.5" / 3" / 4" / 6" / 8") |
Body Material | Ductile Iron AS1831 500-7 |
Valve Seat / Plate Material | Stainless Steel 304 |
Valve Disc / Cover Material | Ductile Iron AS1831 500-7 |
Sealing Gasket Material | EPDM AS1646 |
Diaphragm Material | EPDM Reinforced with Nylon |
Filter / Strainer Material | Stainless Steel 304 |
Needle Valve / Pilot Valve Material | Stainless Steel 304 |
Valve Shaft / Spring / Guiding Plug Material | Stainless Steel 304 |
Working Principle | Self-operated by medium pressure, no external power supply required |
Core Functions | Automatic upstream pressure reduction, stable downstream outlet pressure, anti pressure fluctuation protection for downstream pipelines |
Typical Application Scenarios | Municipal water supply & drainage, fire protection pipeline systems, high-rise building constant pressure water supply networks |
Pressure Adjustment Method | Adjustable via top pilot valve handwheel, settable outlet pressure range |
Installation Orientation | Horizontal pipeline installation |
Q1: What is the working principle of this pressure reducing valve?
A1: It is a diaphragm-type hydraulic self-operated control valve. It relies on water pressure difference to drive the diaphragm, no external power supply needed. The pilot valve senses downstream pressure and automatically adjusts valve opening to keep outlet pressure stable.
Q2: What materials are used for this pressure reducing valve?
A2: Body, valve disk, valve cover and diaphragm plate: Ductile Iron AS1831 500-7. Seat, plate, filter, needle, guiding plug, shaft, spring and pilot-relief valve: SS304. Seal gasket: EPDM AS1646. Diaphragm: EPDM+Nylon.
Q3: What sizes and pressure rating are available?
A3: Available DN50(2"), DN65(2.5"), DN80(3"), DN100(4"), DN150(6"), DN200(8"). Pressure rating: 300 psi.
Q4: What medium can this valve be used for?
A4: It is suitable for clean water, fire protection water. Not applicable for sewage, corrosive liquid or liquid with large solid impurities.
Q5: Where can this pressure reducing valve be installed?
A5: Widely used in water supply & drainage pipelines, fire fighting systems and high-rise building water supply systems. Install horizontally on the pipeline.
