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Watts LF909-DOSY-FS Reduced Pressure Zone Backflow Preventer - Watts RPZ Backflow Preventers
WattsWatts RPZ Backflow Preventers

Watts LF909-DOSY-FS Reduced Pressure Zone Backflow Preventer

The WATTS Reduced Pressure Zone Assembly: LF909 Large is a Watts RPZ Backflow Preventer featuring a cast iron body and flange connection type. This model includes a flood detection sensor and is equipped with an OSY…

SKU 3G-OTH-444374

Also listed as: LF909DOSYFS · LF909 DOSY FS

Brand
Watts
Item
LF909-DOSY-FS Reduced Pressure Zone Backflow Preventer
Category
Watts RPZ Backflow Preventers
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Watts
Manufacturer Part Number
LF909-DOSY-FS
Type
with Flood Detection Sensor, Cast Iron, Flange
Connection Type
Flange
Shut-Off Valve Type
OSY Gate Valve

Technical Documents

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Watts Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The WATTS Reduced Pressure Zone Assembly: LF909 Large is a Watts RPZ Backflow Preventer featuring a cast iron body and flange connection type. This model includes a flood detection sensor and is equipped with an OSY Gate Valve shut-off valve type, as indicated by the manufacturer part number LF909-DOSY-FS.

Frequently Asked Questions

What is the Watts LF909-DOSY-FS reduced pressure zone assembly used for?

The Watts LF909-DOSY-FS is a reduced pressure zone (RPZ) backflow preventer used to protect potable water supplies from cross-connection contamination in commercial, industrial, and municipal applications. Its flood detection sensor provides early leak warning, making it suitable for high-hazard fluid categories where maximum backflow protection is required.

What are the specifications of the Watts LF909-DOSY-FS RPZ assembly?

The Watts LF909-DOSY-FS is a large RPZ backflow preventer with a cast iron body and flange connections. It features an OSY gate valve shut-off type and includes an integrated flood detection sensor. The manufacturer part number is LF909-DOSY-FS. This assembly is designed for high-flow, high-hazard backflow prevention in water systems.

Where to buy the Watts LF909-DOSY-FS RPZ assembly worldwide?

3G Electric supplies the Watts LF909-DOSY-FS RPZ backflow preventer to customers worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your site. Contact our team to source this Watts RPZ assembly for your project, regardless of your location.

How to install a Watts LF909-DOSY-FS reduced pressure zone assembly?

Install the Watts LF909-DOSY-FS in a horizontal position with adequate clearance for testing and maintenance. Ensure flange connections are properly gasketed and bolted to matching pipe flanges. The flood detection sensor should be wired per local codes. Always follow the manufacturer's installation manual and consult a licensed plumber for code compliance.

Used in

Common applications for Watts
Industrial burner gas safety systems — Watts HF2000 filters with GF-series seal kits maintain clean, regulated gas supply to burner pilot and main flame controls
Commercial heating and boiler installations — Modular filter assemblies support preventive maintenance and component replacement without full system shutdown
Process gas delivery pipelines — DN25 through DN125 filter bodies accommodate varying flow rates and inlet pressures across manufacturing and chemical processes
Gas pressure regulation benches — Multi-stage Watts filter platforms integrate with pressure reducers and safety shutoff valves in test and calibration environments
Equipment retrofit and upgrade projects — Available connection sizes and seal kits enable adaptation of newer Watts components into legacy gas control systems
Planned maintenance and spare-parts inventory — Filter seal kits allow facilities to stock consumables in advance, reducing downtime during scheduled gas system servicing

Watts Products

3G Electric supplies Watts watts rpz backflow preventers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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