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Pilot Operated Pressure Relief Valves - National Board of ...

1 Pilot Operated Pressure Relief Valves (POPRV)October 2020 Chief Inspectors MeetingPrepared by: J. F. BallObjectives Definition/ Manufacturers Basic Operation Flowing Pilot vs Non-Flowing Pilot Snap / Pop Action Pilot Modulating Pilot ASME Code Status Applications Features/Benefits (and Concerns) Code Updates Options2 Definition(PTC-25) Pilot - Operated PRV: a Pressure Relief valve in which the disk is held closed by system Pressure , and the holding Pressure is controlled by a Pilot valve actuated by system GreenwoodDresserFarris Ta rge t Rock (nuclear)MercerTaylor ValveLeserApparecchiWeir PowerEarly Pilot Valve Usage56 Basic OperationThe Pilot controls the Main Valve action of.

Pressure - - - Similar to Back Pressure Regulator • Consistent Operation Regardless of Process Phase State • Set Pressures 15 to 1480 psig [1.03 To 102.1 barg] • Temperatures -65 to 550ºF [-54 To 286ºC] • Main Valve Tight to Set Pressure • Minimum Pilot Cracking Pressure: 95% of Set • Pilot Is Balanced Against Back Pressure.

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