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McDonnell Miller Series 250 Pressure Relief Valves

Pressure Relief Valves
Series 250

• 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
• Sizes and material
   – up to 2” NPT – cast iron body, brass seat
• EPDM rubber diaphragm and seat disc
• Maximum temperature 250°F (121°C)

Select a link under the "item" tab below to order.

Cat #DescriptionsPart NumberWeight Ibs.(kg)
250- 3/ 4IN- 15Relief Valve ¾ NPT, 15 psi (1 kg/cm²)1812201.3 (. 6)
250- 3/ 4IN- 30Relief Valve ¾ NPT, 30 psi (2.1 kg/cm²)1812251.3 (. 6)
250- 3/ 4IN- 36Relief Valve ¾ NPT, 36 psi (2.5 kg/cm²)1813251.3 (. 6)
250- 3/ 4IN- 40Relief Valve ¾ NPT, 40 psi (2.8 kg/cm²)1814051.3 (. 6)
250- 3/ 4IN- 45Relief Valve ¾ NPT, 45 psi (3.2 kg/cm²)1814251.3 (. 6)
250- 3/ 4IN- 50Relief Valve ¾ NPT, 50 psi (3.5 kg/cm²)1815251.3 (. 6)
250- 3/ 4IN- 60Relief Valve ¾ NPT, 60 psi (4.2 kg/cm²)1819051.3 (. 6)
250- 3/ 4IN- 75Relief Valve ¾ NPT, 75 psi (5.3 kg/cm²)1816251.3 (. 6)
250- 3/ 4IN- 100Relief Valve ¾ NPT, 100 psi (7 kg/cm²)1817251.3 (. 6)
250- 3/ 4IN- 125Relief Valve ¾ NPT, 125 psi (8.8 kg/cm²)1818251.3 (. 6)
250- 1IN- 15Relief Valve 1 NPT, 15 psi (1 kg/cm²)1819201.5 (. 7)
250- 1IN- 30Relief Valve 1 NPT, 30 psi (2.1 kg/cm²)1819251.5 (. 7)
250- 1IN- 36Relief Valve 1 NPT, 36 psi (2.5 kg/cm²)1820251.5 (. 7)
250- 1IN- 40Relief Valve 1 NPT, 40 psi (2.8 kg/cm²)1820301.5 (. 7)
250- 1IN- 45Relief Valve 1 NPT, 45 psi (3.2 kg/cm²)1821251.5 (. 7)
250- 1IN- 50Relief Valve 1 NPT, 50 psi (3.5 kg/cm²)1822251.5 (. 7)
250- 1IN- 65Relief Valve 1 NPT, 65 psi (4.6 kg/cm²)1822351.5 (. 7)
250- 1IN- 75Relief Valve 1 NPT, 75 psi (5.3 kg/cm²)1823251.5 (. 7)
250- 1IN- 100Relief Valve 1 NPT, 100 psi (7 kg/cm²)1824251.5 (. 7)
250- 1IN- 125Relief Valve 1 NPT, 125 psi (8.8 kg/cm²)1825251.5 (. 7)
250- 2IN- 30Relief Valve 2 NPT, 30 psi (2.1 kg/cm²)18302517.3 ( 7.8)
250- 2IN- 36Relief Valve 2 NPT, 36 psi (2.5 kg/cm²)18312517.3 ( 7.8)
250- 2IN- 40Relief Valve 2 NPT, 40 psi (2.8 kg/cm²)18317517.3 ( 7.8)
250- 2IN- 45Relief Valve 2 NPT, 45 psi (3.2 kg/cm²)18322517.3 ( 7.8)
250- 2IN- 50Relief Valve 2 NPT, 50 psi (3.5 kg/cm²)18332517.3 ( 7.8)


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