Hydraulic Safety

Hydraulic Adjustable Pressure Reducing Valve (500X)

Wanlian 500X Hydraulic Operated Adjustable Pressure Reducing Valve. Automatically reduces a higher inlet pressure to a steady lower downstream pressure, regardless of flow fluctuations or inlet pressure variations.

Key Features

Maintains stable downstream pressure automatically via hydraulic pilot system
Completely self-operated, no external electrical power required
Smooth slow-closing design avoids high pressure surges and water hammer
Heavy-duty ductile iron body with corrosion-resistant brass pilot and fittings

Technical Specifications

Nominal Diameter: DN20 - DN600 (3/4" to 24")
Pressure Adjustment: 0.1 MPa to 1.6 MPa
Nominal Pressure: 1.0 MPa / 1.6 MPa / 2.5 MPa
Design Standard: ANSI / JIS / GB
Body Material: Ductile Iron (QT450-10)

Parts & Materials List

Main Valve Body: Ductile Iron (QT450-10)
Diaphragm: Nylon Reinforced High Elastic EPDM
Internal Stem: Stainless Steel 304
Adjustable Pilot: Solid Forged Brass Alloy
Tubes & Fittings: Copper / Stainless Steel 304

Applications

Water reservoir level control
Pressure management in water networks
Drinking water backflow protection
Pump suction protection

Quality & Testing

Function and pressure tests per applicable standards; diaphragm and seal assemblies tested for durability.

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Frequently Asked Questions

Does the 500X pressure reducing valve need electricity?

No. It is fully self-operated: a hydraulic pilot system senses downstream pressure and modulates the main valve, so it works anywhere pipe pressure exists — no external power or control system required.

What downstream pressure range can the 500X maintain?

The set downstream pressure is adjustable from 0.1 MPa to 1.6 MPa via the pilot assembly, holding a steady value despite flow changes or inlet pressure variation across PN10, PN16 and PN25 inlet ratings.

What sizes are available for the 500X?

DN20 to DN600 (3/4 inch to 24 inch) in ductile iron QT450-10 with a nylon-reinforced EPDM diaphragm, stainless steel 304 internal stem and solid forged brass pilot — designed to ANSI, JIS or GB as required.

How does the 500X prevent water hammer?

The main valve closes slowly and smoothly through the pilot-controlled diaphragm, avoiding the sudden pressure surges that fast-closing valves can create in long water mains.