Watts 3 M1116FM 150 1-1/2" Relief Valve, Ductile Iron, Flanged

The Watts 3 M1116FM 150 is a 1-1/2" angle-pattern pilot-operated pressure relief / sustaining / backpressure control valve with Flanged connections. It features a ductile iron body. Rated to 175 psi.

The 3 inch M116FM (globe) and M1116FM (angle) relief valve meets all requirements for UL listed, FM approved fire protection service. Automatically maintains a constant pressure in the fire protection system by relieving excess pressure. The pressure relief control is normally closed, held closed by an adjustable spring setting to maintain a constant inlet pressure to the main valve.

Features

• Pressure Relief Control Valve
• Class 150 flanged
• 175 psig rated
• Copper tubing/brass fittings

Common Questions

What is the maximum working pressure?

This unit is built as 150# Flanged and is rated to 175 psi. End connection sets the ceiling on this platform, and 150# and 300# bodies are not interchangeable — confirm the class matches your flange drilling before ordering.

Is this valve UL Listed and FM Approved for fire protection?

Yes — this model carries the UL listing and FM approval required for fire-protection service. Non-listed control valves cannot be substituted on a fire job even when the body and pilot are otherwise identical.

Specifications

• Type: Relief
• Size: 1-1/2"
• Inlet Size: 1-1/2"
• Outlet Size: 1-1/2"
• Connection: Flanged
• Body Material: Ductile Iron
• Pressure Class: Class 150
• Max Pressure (psi): 175
• Application: Fire Protection
• Operation: Pilot-Operated Diaphragm
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: 3 M1116FM 150
• Lead-Free: No
• Item Type: Valve
• Control Function: Pressure Relief / Sustaining / Backpressure
• Valve Platform: Mustang (M-Series)
• Body Pattern: Angle
• End Connection / Pressure Class: 150# Flanged
• Coating: Fusion-Bonded Epoxy
• UL Listed / FM Approved: Yes