Low-Resistance Backflow Preventer LHS743X is a backflow prevention device specifically designed for water supply systems, featuring a combination of a two-way check valve and an external drain. It controls the flow of the medium through a safe pressure difference ΔP≥0.005MPa, preventing water quality backflow contamination. Its core advantages include:

Core Features

‌Air Break: When the main valve is closed, the drain valve automatically opens to form an air break, blocking the reverse flow path of the medium.‌

Automatic Drainage: When the pressure difference is insufficient (ΔP ≤ 0.005 MPa), the drain valve releases the accumulated water in the intermediate chamber to restore a safe pressure difference.

Low-friction design: Head loss ≤ 0.03 MPa, suitable for scenarios with sudden drop in water supply pressure.

Technical Specifications

Nominal Pipe Size: DN40 - DN600 (some models support DN1200)

Nominal Pressure: PN1.0 - PN2.5 (equivalent to 1.0 - 2.5 MPa)

‌Main Material: Carbon Steel, Stainless Steel‌

Connection Type: Flange Connection

Application Scenario

For scenarios requiring anti-reverse pollution protection in municipal water supply, fire protection systems, reclaimed water treatment, and industrial pipelines.