• For water tanks and hydronic heating systems • Protects against over-pressure • Minimizes hammering with flash steam • Low differential pressure – 3 psi (.21 kg/cm²) between opening and closing
• Sealed spring chamber prevents scale or sediment build- up
around seal • Cast iron body, brass seat • Maximum temperature 250°F (121°C) • Maximum operating pressure range 30 - 50 psig (2.1 - 3.5 kg/cm²)