Threaded low resistance 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.

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products

Threaded low resistance backflow preventer

Model: DH12X, DH22X

Subtitle：Small diameter low resistance backflow preventer

The Threaded Low Resistance Backflow Preventer is a highly efficient device designed to protect potable water systems from backflow contamination while minimizing pressure loss. With a threaded connection (NPT) and low resistance design, the device is ideal for residential, commercial and light industrial applications where maintaining water pressure and flow...

Classification:backflow preventer

Working conditions:construction work, waterwork, water treatment plant

Product Overview

The Threaded Low Resistance Backflow Preventer is a highly efficient device designed to protect potable water systems from backflow contamination while minimizing pressure loss. Featuring a threaded connection (NPT) and low resistance design, the unit is ideal for residential, commercial and light industrial applications where maintaining water pressure and flow efficiency is critical.

Constructed of lead-free materials, this backflow preventer meets NSF/ANSI 372 and ASSE 1015 standards to ensure safe and reliable operation of potable water systems. Its compact design and threaded connections make it easy to install in tight spaces, while its optimized internal geometry reduces energy consumption by minimizing pressure drop.

Main characteristics

Low resistance design: optimized flow path ensures minimal pressure drop and maintains system efficiency. Ideal for pressure-sensitive applications such as high-rise buildings and long pipelines.

Threaded Connection: NPT threads for easy integration into existing piping systems. Compact design saves space and simplifies installation.

Dual Check Valve System: Two independent check valves provide redundant backflow protection. Test plug facilitates field testing and maintenance.

Lead-free construction: meets NSF/ANSI 372 and Safe Drinking Water Act (SDWA) requirements. Corrosion-resistant to ensure long-term durability of drinking water systems.

COMPACT AND LIGHTWEIGHT: Space-saving design ideal for residential and commercial installations.

Product Advantages

Energy saving: low pressure drop reduces pump energy consumption.

Reliable protection: double check valves ensure fail-safe and prevent backflow.

Easy to maintain: Test plugs can be quickly tested in the field without disassembly.

Corrosion resistance: lead-free construction ensures long life for drinking water systems.

Comparison with Traditional Backflow Preventers

specificities	Threaded low resistance backflow preventer	Conventional Backflow Preventer
pressure drop	Minimum (optimized for low drag)	Higher (due to complex internal design)
mounting	Compact threaded connection for easy installation	Larger size, takes up more space
appliance	Suitable for pressure sensitive systems	For high-risk applications
energy efficiency	High (reduced pressure loss)	Lower (increased pressure loss)

Medium of use

Water/hot water, Sewage/wastewater

working condition

construction work, waterwork, water treatment plant

summarize

The Threaded Low Resistance Backflow Preventer is a high-performance solution for potable water systems where pressure and flow efficiency are important. Its low resistance design, threaded connections and lead-free materials make it a reliable and affordable choice for residential, commercial and irrigation applications. The backflow preventer combines energy efficiency and durability to ensure long-term system reliability and water safety.

Product Parameters

Nominal diameter	½" to 2" (DN15 to DN50)
Nominal pressure	PN6-PN16, max. working pressure 150 LB (10.3 bar)
Applicable temperature	(-29°C to 80°C)
Valve Material	Lead-free copper alloy (C84400 or equivalent)
Seat Material	EPDM or NBR (FDA drinking water compliant)
connection method	Threaded (NPT)
direction of flow	Horizontal or vertical (upward flow)