Watts FP53L-M1-225 1/2 Relief Valve, FNPT

The Watts FP53L-M1-225 1/2 is a 1/2" pressure relief valve for fire protection service, factory set at 225 psi. It is rated to 225 psi.

This 1/2 inch, 225 psi pressure relief valve is designed to relieve thermal expansion in fire protection systems. It features a lever for flushing and draining the system and a second lever to lock the valve closed for hydrostatic testing of the system. This relief valve is FM and UL listed.

Features

• 1/2" male NPT inlet connection
• 1/2" F-NPT outlet connection
• 225 psi set pressure
• FM and UL listed

Common Questions

What pressure is this valve set to?

It is factory set to relieve at 225 psi. The setting is fixed and is not field-adjustable.

Can I use this on potable water?

No. This model is not certified lead-free, so it cannot be installed in a potable (drinking) water line under the NSF/ANSI 372 weighted-average lead rule. Use it on non-potable service, or order the "LF" version of this model for potable water.

Specifications

• Type: Relief
• Size: 1/2"
• Inlet Size: 1/2"
• Outlet Size: 1/2"
• Connection: FNPT
• Max Pressure (psi): 225
• Pack Quantity: 50
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: FP53L-M1-225 1/2
• Certifications: UL, FM
• Lead-Free: No
• Relief Type: Pressure Only
• Factory Set Pressure (psi): 225
• Application: Fire Protection
• Shank Length: Standard
• Approved for Potable Water: No
• SentryPlus Alert Flood Sensor: No