Valve

MCDONNELL & MILLER
PRESSURE RELIEF VALVE

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Pressure Relief Valve

McDonnell & Miller Series 250/260 Pressure Relief Valve

Good engineering practice calls for every hot water boiler to have a pressure relief valve. This spring-loaded valve must be able to release the boiler’s entire load at the boiler’s maximum operating pressure. The burner limit may be jumped-out or stuck in a manual position.

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
Sizes and Materials – Series 260
  • 1 1/2″ NPT Inlet and 2″ NPT Discharge– cast iron body and brass seat
McDonnell & Miller Other Series
  • Series TC-4 Test-N-Check Valve
  • Series 14-B Ball Type Blowdown Valve
Size Range DN8 – 50 / 1/4” – 2” standard port
Max Temp 260 °C / 500 °F
Pressure Rating 55 bar up to 800 psi (55 bar)
Material Carbon Steel, Stainless Steel, Brass body materials
End Threaded

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Series 150S/157S Low Water

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Series 47/247 Water Feeders

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Series 67 – Low Water Cut-Offs

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Series FS7-4 Industrial Liquid

Other Brands

Watts

Mueller Series 105MAP-FV

Spears

Spears PVC Ball Valve 3-Way Full

Barksdale
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Mechanical Pressure Switches

Hamworthy

Engine Room Pumps – Model CG