Watts LF53 Series Spring Operated Adjustable Pressure Relief Valves

The Watts Series LF53 and LF530C Pressure Relief Valves are designed to provide protection from excessive pressure buildup in systems containing water, oil, or air. Constructed with Lead Free* brass and stainless steel springs, these spring-operated valves offer reliable performance and durability.

Used commonly with bore water systems to prevent motor burning when solenoid valves fail to open. 

FEATURES

• Lead Free Construction*: Made with Lead Free* brass to comply with installation requirements for safe use in potable water systems.
• Stainless Steel Springs: Long-lasting and corrosion-resistant springs ensure the valve operates smoothly and reliably.
• Calibrated Adjustment (LF530C only): The LF530C model includes an adjustable pressure range of 50–175 psi (3.4–12.1 bar), allowing you to set the valve to the required relief pressure.
• Standard Pressure Settings (LF53): The LF53 model comes factory preset to standard pressure settings of 75, 100, or 125 psi (5.2, 6.9, or 8.6 bar).
• Multiple Applications: Ideal for use in systems with water, oil, and air, these valves are perfect for bypass thermal expansion relief.

SPECIFICATIONS

• LF530C: Adjustable pressure range 50–175 psi (3.4–12.1 bar) for ½" to ¾" sizes, and 100–300 psi (6.9–20.7 bar) for ¾" size.

MATERIALS

• Body: Lead Free* brass.
• Springs: Stainless steel.
• Disc: Buna-N for durability and chemical resistance.

DIMENSIONS

• Size: ½" or ¾"
• Height: 3" (76mm)
• Width: 1 5/8" (41mm)
• Weight: 5/8 lbs (284g)