One-piece backflow preventer

Backflow preventer is mainly used to prevent the medium in the pipeline from backflow due to pressure inversion, applicable to water, air and non-corrosive liquids, widely used in municipal water supply, building water supply and drainage, fire-fighting and industrial circulation system. Working temperature is generally 0 ℃ to 80 ℃, special materials can withstand higher temperatures. It is suitable for normal pressure to low and medium pressure working conditions. The main function is to realize double protection through the internal non-return and pressure relief structure to prevent backflow of contaminated media. Commonly used materials include copper alloy, stainless steel and ductile iron, compact structure, easy maintenance, to protect the system water quality safety and operational stability.

fig. beginning

products

One-piece backflow preventer

Model: DH41X

Subtitle：Combined backflow preventer

The Integrated Backflow Preventer is a compact, high-performance device designed to prevent backflow and protect water systems from contamination. It combines the functions of a check valve, pressure relief valve and shut-off valve in one unit to ensure reliable operation and compliance with water safety standards.

Classification:backflow preventer

Working conditions:waterwork, water treatment plant

Overview of production assessment

Made of stainless steel, bronze or ductile iron, this backflow preventer is suitable for potable water systems, fire protection networks and industrial processes. Its integrated design simplifies installation and maintenance and is ideal for applications where space efficiency and high reliability are important.

Applicable working conditions

Drinking water systems: protect municipal water supply networks from backflow contamination.

Fire protection: Installation in sprinkler systems and hydrant networks.

Industrial processes: protection of process water systems in the chemical, pharmaceutical and food industries.

Irrigation: prevent fertilizers and chemicals from entering the water supply.

Product Characteristics

All-in-one design: Integrates multiple functions (check, relief, and globe valves) into a single unit. Reduces installation space and simplifies piping layout.

Reliable backflow prevention: double check valves with intermediate relief chamber ensure zero backflow. Meets ASSE 1013, CSA B64.4 and EN 1717 standards.

Durable construction: Valve body material: stainless steel (316L), bronze (C83600), or ductile iron (EN-GJS-400-18). Internal components: Stainless steel components for corrosion resistance and long service life.

Low Maintenance: Self-cleaning design and easily accessible inspection ports simplify maintenance. Replaceable seals and springs reduce downtime and repair costs.

Compliance: Meets international standards such as ASSE 1013, CSA B64.4 and EN 1717.

Product Advantages

Space saving: compact design reduces installation space and simplifies piping layout.

Water safety: Double check valves and pressure relief chamber ensure zero backflow contamination.

Energy saving: low resistance to flow minimizes pump energy consumption.

Easy maintenance: self-cleaning design and replaceable components reduce downtime.

Comparison with standard check valves

specificities	Integrated backflow preventer	Standard Backflow Preventer
devise	One-piece (check valve, pressure relief valve, globe valve)	single component
mounting space	Compact and space-saving	Need more space
safeguard	Easy access inspection ports	More complex maintenance
appliance	Drinking water, firefighting, industry	Universal water supply system

Medium of use

Water/hot water, Sewage/wastewater

working condition

waterwork, water treatment plant

summarize

The Integrated Backflow Preventer is a versatile, high-performance solution for preventing backflow and ensuring safe water quality in drinking water, fire protection and industrial systems. Its integrated design, robust construction and compliance with international standards make it ideal for applications where space efficiency and reliable performance are important. The backflow preventer combines advanced technology with user-friendly operation to ensure long-term system protection and water quality.

Product Parameters

Nominal diameter	DN15 to DN300 (?" to 12")
Nominal pressure	PN16 to PN25 (EN 1092) or Class 150 to Class 300 (ASME B16.34)
Applicable temperature	-10°C to 120°C (EPDM seals) / -20°C to 80°C (NBR seals)
Valve Material	Stainless steel (316L), bronze (C83600), ductile iron (EN-GJS-400-18)
sealing material	EPDM, NBR or PTFE for zero leakage
connection method	Flanges (EN 1092, ASME B16.5)