Cla-Val 55L CASING RELIEF VALVE

Cla-Val Model 55L Pressure Relief Valve

The Cla-Val Model 55L is a direct-acting, spring-loaded, diaphragm-type pressure relief valve designed specifically for fire protection systems. UL Listed and Factory Mutual (FM) Approved, it delivers precise pressure control to protect your fire pump and distribution network from dangerous overpressure conditions.

Key Features

• UL Listed & FM Approved for fire protection service
• Direct-acting design for precise, dependable pressure control
• Positive, drip-tight closure — no leakage at set pressure
• No packing glands or stuffing boxes for low-maintenance operation
• Sensitive to small pressure variations for accurate relief
• Installs in any position
• Available in three pressure ranges: 0–75 psi, 20–175 psi, and 100–300 psi
• Adjustment cap can be wire-sealed to prevent tampering

Typical Application

Used on fire protection system headers to prevent pressure build-up when line pressure exceeds the spring setting. The valve opens to relieve excess pressure to atmosphere, protecting the distribution network from damage. Commonly installed alongside the Cla-Val 90-21 Pressure Reducing Valve on main fire headers serving multi-floor buildings.

Also available in Seawater Service Material — contact us for details.