Watts 1-1/2 LFM1116 THD Lead-Free Relief Valve, Ductile Iron, Flanged

The Watts 1-1/2 LFM1116 THD is a 1-1/2" lead-free angle-pattern pilot-operated pressure relief / sustaining / backpressure control valve with Flanged connections. It features a ductile iron body and a epdm seat. Rated to 600 psi and up to 300°F. This model is certified lead-free for potable-water installations.

This 1 1/2 inch threaded angle pressure relief, sustaining or backpressure control valve is designed to permit flow when upstream pressure is above the adjustable setpoint of the control pilot, and throttle toward closed when upstream pressure falls below the adjustable setpoint.

Features

• Threaded
• 400 psig rated
• Maintains flow regardless of upstream pressure
• 20-200 psig

Common Questions

What is the maximum working pressure?

This unit is built as 150# Flanged and is rated to 600 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.

What fluid temperature can the EPDM trim handle?

This valve is built with EPDM elastomers, good to about 300°F. Watts offers the same body with Buna-N (to 160°F), FKM/Viton (to 250°F) or EPDM (to 300°F) — pick the elastomer for your fluid temperature, not the body.

Is this valve certified lead-free for potable water?

Yes. The "LF" prefix denotes Watts lead-free construction, compliant with the weighted-average 0.25% lead requirement of the Safe Drinking Water Act (NSF/ANSI 372) for potable-water service.

Specifications

• Type: Relief
• Size: 1-1/2"
• Inlet Size: 1-1/2"
• Outlet Size: 1-1/2"
• Connection: Flanged
• Body Material: Ductile Iron
• Seat / Seal Material: EPDM
• Pressure Class: Class 150
• Max Pressure (psi): 600
• Operation: Pilot-Operated Diaphragm
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: 1-1/2 LFM1116 THD
• Temperature: up to 300°F
• Lead-Free: Yes
• Item Type: Valve
• Control Function: Pressure Relief / Sustaining / Backpressure
• Valve Platform: Mustang (M-Series)
• Body Pattern: Angle
• End Connection / Pressure Class: 150# Flanged
• Coating: ArmorTek 3-Part Epoxy