What is the working principle of this backflow preventer?

In normal flow, inlet pressure opens both check valves while the relief valve stays shut. If pressure shifts, check valves close to block reverse flow, opening the relief valve to drain the chamber and create an air gap.

What certifications does this product hold?

The product holds GS, CE, and ISO9001 certifications, ensuring compliance with international safety and quality standards.

Double Check Backflow Preventer for Municipal Water Networks

Name: Double Check Backflow Preventer for Municipal Water Networks
Brand: Shanghai Zentif Valve Group Co., Ltd.
SKU: 1999074021

Shanghai, ChinaShanghai Zentif Valve Group Co., Ltd.

US$30.00-60.00

5 Pieces

Sample price:US$200.00/piece.Request sample

Product profile

Customization

Available

Media

Water

Temperature

Ordinary Temperature

Model NO.

LHS743X

Material

Cast Iron

Connection Form

Flange

Structure

Double Check with Relief Valve

Pressure

Ordinary Pressure

Function

Backflow Prevention and Water Supply Isolation

Sealing Form

Soft Sealing

Flow Direction

Unidirection

Standard

Application

Water Industrial Usage

Product Name

Low-Resistance Backflow Preventer

Model

Lhs743X

Valve Type

Backflow Preventer

Nominal Diametre

DN50-300

Nominal Pressure

Pn10-16

Working Temperature

0℃ ~ 80℃

Valve Body

Ductile Iron

Internal Component

Stainless Steel

Advantages-01

High Safety Backflow Protection

Advantages-02

Prevents Contamination & Water Hammer

Certification

GS, CE, ISO9001

Transport Package

Seaworthy Wooden Case

Specification

DN50-DN300

Trademark

Zentif

Origin

China

HS Code

8421199090

Production Capacity

50000

Key features

Robust Dual-Check Protection: Dual check valves provide redundant barriers to prevent backflow and back-siphonage automatically.

Automatic Pressure Relief: Relief valve drains the middle chamber to create an air gap, stopping contamination effectively.

Energy Efficient Design: Streamlined flow passage reduces head loss, boosting energy efficiency and cutting pump costs.

Durable Cast Iron Body: Ductile iron body ensures strength and durability, while stainless steel components resist corrosion.

Versatile Application Range: Suitable for municipal water, HVAC, fire protection, and industrial water systems.

Hydraulic Operation: Operates via hydraulic pressure without needing external energy sources for reliability.

Certified Quality Standards: ISO-certified with GS, CE, and ISO9001 certifications for high safety and compliance.

Wide Size Compatibility: Available in nominal diameters from DN50 to DN300 to fit various pipeline requirements.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceIn-stock CapacityFast Delivery

Shanghai Zentif Valve Group Co., Ltd.

Shanghai, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Designs CertifiedExport Year: N/A CertifiedNearest Port: Shanghai PortAverage Response Time: ≤1.96h

About Our Factory & Business Background

AddressNo. 111 Huangjia Garden Road, Jiangqiao Town, Jiading District, Shanghai, China

Plant Area12819.22 square meters

Number of Employees81

Registered Capital55,484,089 RMB

Terms of PaymentLC, T/T, D/P, PayPal, Western Union, Small-amount payment

International Commercial Terms(Incoterms)FOB, CIF, CFR, EXW

Average Lead TimePeak Season Lead Time: within 15 workdays Off Season Lead Time: within 15 workdays

Minimum Order Quantity500 PICS

Supply Chain Partners12

Our Production Capability & Technical Expertise

Main Productsangle valve

Production Lines5

Production MachinesCNC Lathe, Lathe, Shot Blasting Facility, Vertical Lathe

QA/QC inspectors3 people

Inspection Type for Finished Products100% inspection(Visual inspection & Function inspection)

Inspection Method for Finished ProductsHave instructions and uniformly followed

R&D Engineers2 people

Traceability of Raw MaterialsYes

Our Industry Experience & Global Business Record

Year of Establishment2001-03-20

Main MarketsDomestic

Repeat Buyers Choice50%~80%

Number of Foreign Trading Staff4

Overseas Agent/BranchNo

New Products Launched in Last yearNo

Our Certifications, Standards & Industry Recognition

Cooperated with Fortune 500No

Product Q&A

Q:How to choose the right backflow preventer?

For potable water, RPZ backflow preventers are best for high-risk. Consider pipeline size, pressure, and hazard level. Double check valves work for lower risk; RPZ offers top protection.

Q:Why are backflow preventers vital in water systems?

Backflow preventers protect drinking water from contamination by back pressure or siphonage. Required by most municipal codes and high-rises, these devices ensure public health and prevent cross-connection risks.

Q:Can backflow preventers be used in fire protection systems?

Yes. Specialized backflow preventers in fire protection systems prevent non-potable water from re-entering the municipal supply, ensuring safety while meeting fire protection and drinking water standards.

Q:How do backflow preventers improve safety in HVAC and industrial water systems?

Backflow preventers protect chilled, heating, and process water systems from reverse flow contamination. They maintain water quality, prevent equipment corrosion, and ensure compliance with health and safety regulations in commercial and industrial environments.

Q:What materials are used for the valve body and components?

The valve body is made of ductile iron for strength, while internal components use stainless steel to resist corrosion. Sealing rings are made of NBR/EPDM for dependable shut-off.