We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
RFQ CartGet a QuoteSign inSign up
Watts Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron - ASME Section XIII Hot Water Pressure Relief Valves
WattsASME Section XIII Hot Water Pressure Relief Valves

Watts Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron

The WATTS Relief Valve is an ASME Section XIII Hot Water Pressure Relief Valve with FNPTF x FNPTF connections, sized 1 1/2 in x 2 in in iron, rated for a maximum operating pressure of 75 psi (MPN 1-1/2 740 075 FS).

SKU 3G-OTH-442542

Also listed as: 112740075FS · 1 1 2 740 075 FS · 1-1-2-740-075-FS

Brand
Watts
Item
Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron
Category
ASME Section XIII Hot Water Pressure Relief Valves
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

Watts
Manufacturer Part Number
1-1/2 740 075 FS
Type
1 1/2 in x 2 in, Iron
Max. Op Pressure
75 psi

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Product Description

The WATTS Relief Valve is an ASME Section XIII Hot Water Pressure Relief Valve with FNPTF x FNPTF connections, sized 1 1/2 in x 2 in in iron, rated for a maximum operating pressure of 75 psi (MPN 1-1/2 740 075 FS).

Frequently Asked Questions

What is a Watts 1-1/2 740 075 FS relief valve used for?

This Watts ASME Section XIII hot water pressure relief valve protects boilers and water heaters from overpressure. It automatically opens at 75 psi to discharge excess pressure, preventing system damage. Common in commercial and industrial hydronic heating systems.

What are the specifications of the Watts 1-1/2 740 075 FS relief valve?

The Watts 1-1/2 740 075 FS is a 1 1/2 in x 2 in FNPTF x FNPTF iron relief valve with a maximum operating pressure of 75 psi. It is ASME Section XIII rated for hot water service. The iron body provides durability in high-temperature systems.

Where to buy a Watts 1-1/2 740 075 FS relief valve worldwide?

3G Electric supplies the Watts 1-1/2 740 075 FS relief valve to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this ASME Section XIII valve.

How to install a Watts 1-1/2 740 075 FS relief valve?

Install the Watts relief valve in the hot water outlet line of the boiler or heater, with the sensing element immersed in the top 6 inches of the tank. Ensure the discharge piping is directed to a safe drain and is not restricted. Follow local codes and the manufacturer's instructions.

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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
WATTS Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron, 75 psi Max. Op Pressure (MPN 1-1/2 740 050 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron, 75 psi Max. Op Pressure (MPN 1-1/2 740 050 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 1 740 075 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 1 740 075 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 1-1/4 740 050 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 1-1/4 740 050 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 1-1/4 740 075 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 1-1/4 740 075 FS)
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 2 740 050 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 2 740 050 FS)
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 1 740 050 FS)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 1 740 050 FS)

More from Watts

View all Watts parts →
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
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)
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/2 in x 1 1/2 in, Copper Silicon Alloy (MPN 0121544)
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy (MPN 0121522)
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy (MPN 0121522)
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
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)
Watts
WATTS Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 2 740 030 FS)
Watts
Watts
WATTS RELIEF VALVE: NPTF x NPTF, 1 1/4 in x 1 1/2 in, Iron, 30 psi Max. Op Pressure (MPN F383025)
Watts
Watts
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)
Watts
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)