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WattsASME Section XIII Hot Water Pressure Relief Valves

Watts ASME Section XIII Hot Water Pressure Relief Valve

The Watts 3/4 in x 3/4 in NPTF x NPTF Relief Valve (MPN F358551) is an ASME Section XIII hot water pressure relief valve constructed of iron with a maximum operating pressure of 40 psi and an overall height of 3 1/2…

SKU 3G-OTH-442529

Also listed as: F 358551 · F-358551

Brand
Watts
Item
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
F358551
Type
3/4 in x 3/4 in, Iron
Overall Ht
3 1/2 in
Max. Op Pressure
40 psi

Technical Documents

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

Product Description

The Watts 3/4 in x 3/4 in NPTF x NPTF Relief Valve (MPN F358551) is an ASME Section XIII hot water pressure relief valve constructed of iron with a maximum operating pressure of 40 psi and an overall height of 3 1/2 in. 3G Electric interprets demand for this genuine Watts safety component 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 F358551 relief valve used for?

The Watts F358551 is an ASME Section XIII hot water pressure relief valve used in hydronic heating systems and water heaters. It automatically opens to discharge water when system pressure exceeds 40 psi, preventing overpressure damage. Common applications include commercial and residential boiler installations.

What are the specifications of the Watts F358551 relief valve?

The Watts F358551 has a 3/4 in NPTF x 3/4 in NPTF connection, iron body, 40 psi maximum operating pressure, and 3 1/2 in overall height. It is an ASME Section XIII hot water pressure relief valve. The manufacturer part number is F358551.

Where to buy the Watts F358551 relief valve worldwide?

3G Electric supplies the Watts F358551 relief valve worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time. We source and deliver this ASME-rated valve to any country.

How to install the Watts F358551 relief valve?

Install the Watts F358551 relief valve in the hot water system discharge line with the inlet connected to the system and outlet open to atmosphere. Ensure no shutoff valve is placed between the valve and system. Follow local plumbing codes and ASME guidelines. Use thread sealant on NPTF 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
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Iron hot water pressure relief valve with 3/4 in NPTF x NPTF connections. Rated for 20 psi maximum operating pressure. Overall height 3 1/2 in. ASME Section XIII rated for hot water service. Used to protect water heaters and boilers from overpressure in commercial and industrial hot water systems
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WATTS RELIEF VALVE: NPTF x NPTF, 1 1/2 in x 2 in, Iron, 30 psi Max. Op Pressure, 9 1/4 in Overall Ht (MPN F383740)
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This ASME Section XIII hot water pressure relief valve features a 1 1/4 in x 1 1/2 in NPTF x NPTF iron body. Rated for a maximum operating pressure of 30 psi, it automatically opens to discharge excess water and prevent overpressure in hot water systems. Suitable for use in commercial and industrial water heating applications
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This ASME Section XIII certified pressure relief valve is designed for hot water service on pressure vessels such as water heaters and boilers. The iron body features NPTF connections (2 in inlet x 2 1/2 in outlet) and opens automatically at its 30 psi set pressure to discharge excess water, preventing overpressure damage. Suitable for commercial and industrial hot water systems
WATTS Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron, 20 psi Max. Op Pressure (MPN 0358553)
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WATTS Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron, 20 psi Max. Op Pressure (MPN 0358553)
This Watts pressure relief valve is constructed of iron with FNPTF x FNPTF connections. Rated for a maximum operating pressure of 40 psi, it is designed for ASME Section XIII hot water service. Typical applications include protecting water heaters and boilers from overpressure in commercial and industrial systems
Watts
This Watts pressure relief valve is constructed of iron with FNPTF x FNPTF connections. Rated for a maximum operating pressure of 40 psi, it is designed for ASME Section XIII hot water service. Typical applications include protecting water heaters and boilers from overpressure in commercial and industrial systems

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