Series 250 Pressure Relief Valves

McDonnell & Miller : Valves :

Features and Benefits

  • For 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
  • Sizes and material
  • – 3⁄4″ – 1″ NPT – bronze body and seat
  • – 2″ NPT – cast iron body, brass seat
  • EPDM rubber diaphragm and seat disc
  • Maximum temperature 250°F (121°C)
  • Maximum operating pressure range 30 – 125 psig (2.1 – 8.8 kg/cm2)


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