Pressure Relief Valves
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M&M diaphragm operated cast iron and diaphragm-assist operated bronze ASME Safety Relief Valves are designed to protect fired and unfired hot water pressure vessels against over pressure conditions. The diaphragm's "oversized" effective area generates a greater operating force which helps to overcome the effects of fouling. These valves feature a unique fail-safe disc with sufficient area to permit the valves to maintain their safety relief function in the event of a diaphragm rupture. These valves are designed, manufactured, tested and labeled in accordance with the requirements of Section IV of the ASME Boiler and Pressure Vessel Code. They are offered in a wide range of capacities to permit a close match with the boiler output rating
- 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
- Maximum temperature 250°F (121°C)
Sizes and Materials – Series 250
- 3⁄4″ – 1″ NPT – bronze body and seat
- 2″ NPT – cast iron body, brass seat
- EPDM rubber diaphragm and seat disc
- Maximum operating pressure range 30 – 125 psig (2.1 – 8.8 kg/cm2)
Sizes and Materials – Series 260
- 1 1/2″ NPT Inlet and 2″ NPT Discharge– cast iron body and brass seat
- Maximum operating pressure range 30 – 50 psig (2.1 – 3.5 kg/cm2)