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Watts Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy - ASME Section XIII Hot Water Pressure Relief Valves
WattsASME Section XIII Hot Water Pressure Relief Valves

Watts Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy

The WATTS Relief Valve (SKU 3G-OTH-442463) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, available in a 3/4 in x 3/4 in Copper Silicon Alloy configuration. It has a maximum…

SKU 3G-OTH-442463

Also listed as: 34LF174A125FS · 3 4 LF174A 125 FS · 3-4-LF174A-125-FS

Brand
Watts
Item
Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy
Category
ASME Section XIII Hot Water Pressure Relief Valves
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Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
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Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

Watts
Manufacturer Part Number
3/4 LF174A 125 FS
Type
3/4 in x 3/4 in, Copper Silicon Alloy
Max. Op Pressure
150 psi

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

Product Description

The WATTS Relief Valve (SKU 3G-OTH-442463) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, available in a 3/4 in x 3/4 in Copper Silicon Alloy configuration. It has a maximum operating pressure of 150 psi (MPN 3/4 LF174A 125 FS).

Frequently Asked Questions

What is the Watts 3/4 LF174A 125 FS relief valve used for?

The Watts 3/4 LF174A 125 FS is an ASME Section XIII hot water pressure relief valve. It protects water heaters and boilers from overpressure by automatically opening at a set pressure, preventing system damage and ensuring safe operation in commercial and industrial hot water systems.

What are the specifications of the Watts 3/4 LF174A 125 FS relief valve?

This Watts relief valve has 3/4 inch FNPTF x FNPTF connections, a copper silicon alloy body, and a maximum operating pressure of 150 psi. It is ASME Section XIII certified for hot water service. The manufacturer part number is 3/4 LF174A 125 FS.

Where to buy the Watts 3/4 LF174A 125 FS relief valve worldwide?

3G Electric supplies the Watts 3/4 LF174A 125 FS relief valve worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on this ASME Section XIII valve.

How to install the Watts 3/4 LF174A 125 FS relief valve?

Install the Watts relief valve in the hot water system's designated tapping, ensuring the inlet is connected to the system and the outlet is piped to a safe discharge location. Follow local codes and the manufacturer's instructions. Use thread sealant on the FNPTF connections and test after installation.

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 asme section xiii hot water pressure relief valves. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 3/4 LF174A 100 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 3/4 LF174A 100 FS)
WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 3/4 LF174A 150 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 3/4 LF174A 150 FS)
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 in, Bronze, 150 psi Max. Op Pressure (MPN 2 174A 125 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 in, Bronze, 150 psi Max. Op Pressure (MPN 2 174A 125 FS)
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 in, Bronze, 150 psi Max. Op Pressure (MPN 2 174A 100 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 in, Bronze, 150 psi Max. Op Pressure (MPN 2 174A 100 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 1/2 in x 1 1/2 in, Copper Silicon Alloy, 9 1/4 in Overall Ht (MPN 1-1/2 LF174A 150 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 1/2 in x 1 1/2 in, Copper Silicon Alloy, 9 1/4 in Overall Ht (MPN 1-1/2 LF174A 150 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 1 LF174A 150 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 1 LF174A 150 FS)

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WATTS Relief Valve: FNPT x FNPT, 1 in x 1 in, Bronze, 94 psi Max. Op Pressure, 5 3/4 in Overall Ht (MPN 1 174A 125 FS)
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WATTS Relief Valve: FNPT x FNPT, 1 in x 1 in, Bronze, 94 psi Max. Op Pressure, 5 3/4 in Overall Ht (MPN 1 174A 125 FS)
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/2 in x 1 1/2 in, Copper Silicon Alloy (MPN 0121544)
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WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 3/4 LF174A 75 FS)
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WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 3/4 LF174A 75 FS)
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 2 740 030 FS)
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WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 2 740 030 FS)
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WATTS RELIEF VALVE: NPTF x NPTF, 1 1/4 in x 1 1/2 in, Iron, 30 psi Max. Op Pressure (MPN F383025)
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WATTS RELIEF VALVE: NPTF x NPTF, 3/4 in x 3/4 in, Iron, 20 psi Max. Op Pressure, 3 1/2 in Overall Ht (MPN F358553)
WATTS Relief Valve: FNPTF x FNPTF, 1 1/2 in x 1 1/2 in, Bronze, 150 psi Max. Op Pressure (MPN 1-1/2 174A 150 FS)
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WATTS Relief Valve: FNPTF x FNPTF, 1 1/2 in x 1 1/2 in, Bronze, 150 psi Max. Op Pressure (MPN 1-1/2 174A 150 FS)