Watts LF530-C 3/4 1/2" Lead-Free Relief Valve, Brass, NPT

The Watts LF530-C 3/4 is a 1/2" lead-free calibrated adjustable pressure relief valve for thermal expansion / general service service, field-adjustable over 100-300 psi. It features a brass body. Rated to 300 psi. This model is certified lead-free for potable-water installations.

This 3/4 inch lead free calibrated pressure relief valve is designed for use only as protection from the build up of excessive pressure in systems containing water, oil or air. It features a lead free brass body with 3/4 inch NPT male inlet and 1/2 inch NPT female (drain) outlet, stainless steel spring, lead free brass bonnet and a Buna-N disc and O-ring. The pressure relief spring adjustable range is 100 to 300 psi (6.9 to 20.7 bar).

Features

• Lead free brass body construction
• All stainless steel adjustable spring
• Adjustable range 100 to 300 psi
• Buna-N disc on machined body seat

Common Questions

What pressure does this relieve at?

This is a calibrated valve — you set it. It adjusts over 100-300 psi, so it has no factory set point. Set it below the working pressure rating of the equipment you are protecting, and re-check the setting after installation.

Is this ASME rated?

No. This is a calibrated relief valve and is explicitly not ASME approved, so it may not be used as the code-required safety relief on a boiler or a water heater. It is intended for thermal expansion and general bypass duty. Where an ASME valve is required, specify one that carries the HV stamp.

Can I use this on potable water?

Yes. It is certified lead-free to NSF/ANSI 372, which is what plumbing codes require for any device in a drinking-water line.

Specifications

• Type: Relief
• Size: 1/2"
• Inlet Size: 3/4"
• Outlet Size: 1/2"
• Connection: NPT
• Body Material: Brass
• Max Pressure (psi): 300
• Pack Quantity: 50
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: LF530-C 3/4
• Lead-Free: Yes
• Relief Type: Calibrated Adjustable
• Adjustment Range: 100-300 psi
• ASME Code Rating: Not ASME Rated
• Application: Thermal Expansion / General Service
• Connection Configuration: MNPT inlet x FNPT outlet
• Approved for Potable Water: Yes
• SentryPlus Alert Flood Sensor: No