Hydraulic Safety

Anti-Pollution Backflow Preventer (HS41X-16)

HS41X Anti-pollution Backflow Preventer is an advanced water security valve consisting of two series-connected check valves and a drainage cavity. It strictly prevents medium backflow to protect drinking water networks from pollution.

Key Features

Double independent check valves ensure absolute backflow cutoff
Central automatic drain valve drains water immediately if upstream pressure drops
Low head loss design with optimal fluid channels
EPDM seat encapsulation ensures long life and complete sealing

Technical Specifications

Nominal Diameter: DN50 - DN600
Nominal Pressure: 1.0 MPa / 1.6 MPa / 2.5 MPa
Body Material: Ductile Iron / Cast Steel / Stainless Steel
Applicable Medium: Drinking Water, Potable Water
Working Temperature: 0°C to 80°C

Parts & Materials List

Body & Bonnet: Ductile Iron QT450
Check Valve Discs: Stainless Steel 304 / EPDM covered
Intermediate Drain Valve: Solid Brass / Stainless Steel 304
Main Springs: 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

Do hydraulic control valves require electrical power?

Most hydraulic control valves (e.g. F745X level control, 500X pressure reducing) are fully self-operated by pipeline pressure and require no external power. Solenoid-controlled models such as GKZF-1 use AC220V or DC24V.

What is the pressure adjustment range of the 500X valve?

The 500X pressure reducing valve adjusts downstream pressure from 0.1 MPa to 1.6 MPa and works with inlet pressures up to the nominal rating (PN10/PN16/PN25).

What materials are used for potable water applications?

For drinking water networks, models such as the HS41X backflow preventer use ductile iron bodies with EPDM seals and stainless steel internals, compliant with GB/T17219 sanitary requirements.

How is water hammer prevented in hydraulic valves?

Pilot-controlled valves close smoothly and slowly, which avoids sudden pressure surges. Needle valves allow adjustment of the closing speed to match the specific pipeline conditions.