851DR Pressure Relief Valve, Ductile Iron, 1-1/4″ MNTP x 2″ MNTP

This relief valve was designed for use in large pressure vessels.

The ASME certified slope of 2.5 yields, for example, a capacity of 54 lbs. per minute of air @ 250psi set pressure.

All Cyrus Shank relief valves are manufactured in accordance with ASME Boiler and Pressure Vessel Code Section VIII Division I and stamped with The ASME Certification Mark with UV Designator.

All Cyrus Shank relief valve capacities are certified by The National Board of Boiler and Pressure Vessel Inspectors and stamped with The NB Certification Mark.

All relief valves come with an installation tag and cable tie.

Features:

• National Board Certification #: 51231
• Set Pressure Range: 150-400 PSI in 25 PSIG increments
• Upper and lower seats from 304 stainless steel and embedded with a Teflon ring.
• Stainless steel springs