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Watts 1 LF174A 125 FS ASME Section XIII Hot Water Pressure Relief Valve - ASME Section XIII Hot Water Pressure Relief Valves
WattsASME Section XIII Hot Water Pressure Relief Valves

Watts 1 LF174A 125 FS ASME Section XIII Hot Water Pressure Relief Valve

The WATTS Relief Valve (MPN 1 LF174A 125 FS) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, 1 in x 1 in size, constructed from copper silicon alloy, and rated for 150 psi…

SKU 3G-OTH-442479

Also listed as: 1LF174A125FS · 1-LF174A-125-FS

Brand
Watts
Item
1 LF174A 125 FS ASME Section XIII Hot Water Pressure Relief Valve
Category
ASME Section XIII Hot Water Pressure Relief Valves
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

Watts
Manufacturer Part Number
1 LF174A 125 FS
Type
1 in x 1 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 (MPN 1 LF174A 125 FS) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, 1 in x 1 in size, constructed from copper silicon alloy, and rated for 150 psi maximum operating pressure. 3G Electric interprets this demand and delivers the genuine WATTS part across 14 industrial departments, with specialist depth in combustion, pumps and controls as an authorised distributor.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the Watts LF174A relief valve used for?

The Watts LF174A is an ASME Section XIII hot water pressure relief valve used in commercial and industrial hydronic systems. It protects water heaters, boilers, and storage tanks from overpressure by automatically discharging water when system pressure exceeds 150 psi.

What are the specifications of the Watts LF174A relief valve?

The Watts LF174A has 1 in FNPTF x 1 in 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 1 LF174A 125 FS.

Where to buy the Watts LF174A relief valve worldwide?

3G Electric supplies the Watts LF174A relief valve worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on this ASME-rated valve.

How to install a Watts LF174A relief valve?

Install the Watts LF174A in the hot water system's tapping, ensuring the valve's inlet is connected to the tank or heater. Orient the discharge piping downward, with no shutoff valves between the valve and the system. Follow local codes and the manufacturer's instructions for safe operation.

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, 1 in x 1 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 1 LF174A 100 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 1 LF174A 100 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)
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)
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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 1/4 in x 1 1/4 in, Copper Silicon Alloy, 8 1/2 in Overall Ht (MPN 1-1/4 LF174A 150 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy, 8 1/2 in Overall Ht (MPN 1-1/4 LF174A 150 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy, 8 1/2 in Overall Ht (MPN 1-1/4 LF174A 100 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy, 8 1/2 in Overall Ht (MPN 1-1/4 LF174A 100 FS)
ASME Section XIII hot water pressure relief valve with 3/4 in FNPTF x FNPTF connections. Copper silicon alloy body rated for 150 psi maximum operating pressure. Used to protect water heaters and boilers from overpressure in hot water systems
Watts
ASME Section XIII hot water pressure relief valve with 3/4 in FNPTF x FNPTF connections. Copper silicon alloy body rated for 150 psi maximum operating pressure. Used to protect water heaters and boilers from overpressure in hot water systems

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ASME Section XIII hot water pressure relief valve with 2 in FNPTF x 2 in FNPTF connections. Constructed of copper silicon alloy. Rated for 150 psi maximum operating pressure. Used in hydronic systems to protect boilers, water heaters, and storage tanks from overpressure
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This ASME Section XIII hot water pressure relief valve features 3/4 in FNPTF x 3/4 in FNPTF connections and a copper silicon alloy body. It automatically opens to relieve excess pressure in hot water heating systems, protecting against overpressure conditions. Commonly used in boilers, water heaters, and thermal systems
This ASME Section XIII pressure relief valve is designed for hot water systems, automatically opening when pressure exceeds safe limits to prevent overpressure damage. Constructed with a copper silicon alloy body and featuring FNPTF x FNPTF connections, it is suitable for use in boilers, water heaters, and hydronic heating systems
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This ASME Section XIII hot water pressure relief valve features a copper silicon alloy body and FNPTF x FNPTF connections. It is rated for a maximum operating pressure of 150 psi. Typical applications include overpressure protection for water heaters, boilers, and storage tanks in commercial and industrial hydronic systems