Valve
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
Detail Specification
| 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 |
