Stainless Steel Internal Thread Low Resistance Backflow Preventer Valve LHS712X

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Stainless Steel Internal Thread Low Resistance Backflow Preventer Valve LHS712X

Product Name: Stainless Steel Internal Thread Low Resistance Backflow Preventer Valve Model: LHS712X    Nominal Diameter: 32-50mm     

Nominal Pressure: 1.0~1.6MPa   Applicable Temperature: 0~95℃    Valve Body Material: Ductile Iron/Carbon Steel/Stainless Steel Seal Material: EPDM/Q       Applicable Medium: Clean Water

Product Introduction:

The HS711X low resistance backflow preventer consists of two check valves (front and rear) and an intermediate automatic drain valve. In the event of backflow, both check valves automatically close, and the drain valve opens, creating an atmospheric break in the intermediate chamber. If leakage occurs in either check valve, the system automatically drains to block backflow, strictly preventing contamination and protecting the water quality in the upstream pipeline.

Features:

① The main valve consists of two check valves (front and rear) and an intermediate automatic drain valve.

② In case of leakage in the check valves, it automatically drains to block backflow, strictly preventing contamination and protecting upstream water quality.

③ Ultra-low water loss and significant energy savings: head loss is less than 0.03 MPa.

④ Air gap and automatic drainage: During backflow, when the main valve closes, the drain valve opens, depressurizing the intermediate chamber to zero, creating an air gap or zero-pressure break between upstream and downstream, effectively preventing backflow contamination.

⑤ Space and material savings, flexible installation: Compact size, lightweight, with a structural length only 30% of similar products; can be installed horizontally or vertically.

⑥ Complies with health and safety standards for water contact products.

Stainless Steel Internal Thread Low Resistance Backflow Preventer Valve LHS712X

Working Principle:

● Forward Flow:

When inlet pressure exceeds outlet pressure, both check valve discs open, and the drain valve closes. At a flow velocity of 2 m/s, the flow resistance loss is less than 0.04 MPa.

● Reverse Closure:

When inlet pressure is less than or equal to outlet pressure, both check valve discs close, and the drain valve opens.

If no debris is stuck, both check valve discs seal tightly, the drain outlet does not discharge, and the intermediate chamber communicates with the atmosphere, maintaining zero pressure.

● Backflow Contamination Prevention:

When inlet pressure is lower than outlet pressure, both check valve discs remain closed, and the drain valve is open. If debris causes leakage in one or both check valve discs, the leaked medium flows into the intermediate chamber and is discharged directly through the drain valve, preventing backflow contamination to the inlet side.

Product Types:

① Built-in Drain Type Low Resistance Backflow Preventer DN≤50 Thread Connection: LHS711X Type DN15-DN25

LHS712X Type DN32-DN50 Note: LHS711X does not include test ball valves or inlet filters.

② Straight Flow Type Low Resistance Backflow Preventer

Flange Connection

Model: LHS743X Type DN50-DN200

③ Online Maintenance Type Low Resistance Backflow Preventer

Flange Connection

Model: LHS745X Type DN150-DN400 Equipped with inlet filter and expansion flange.

Main Dimensions: