McDonnell & Miller Series 260 Pressure Relief Valve
• 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
• Meets ASME Pressure Vessel and Boiler Code, Section IV
• Sealed spring chamber prevents scale or sediment build-up around seal
• 11⁄2″ NPT Inlet and 2″ NPT Discharge
• Cast iron body, brass seat
• Maximum temperature 250°F (121°C)
• Maximum operating pressure range 30 – 50 psig (2.1 – 3.5 kg/cm2)
