3900 Series MPV Modular Pilot Operated Safety Relief Valve

Consolidated 3900 Series MPV Modular Pilot-Operated Safety Relief Valve

Inlet Sizes

1” through 12”

Inlet Ratings

ASME Class 150 to 2500

Outlet Sizes

2” through 16”

Outlet Ratings

ASME Class 150 to 300

Orifice Sizes

D though T, Full Bores

Set Pressure Range

15 to 6250 psig

Temperature Range

-40°F to 505°F, above 505°F with heat exchanger


Stainless steel pilot with carbon steel main valve and stainless steel trim

Standards and Regulations

ASME B & PVC, Section VIII

 API 526


The Consolidated 3900 series modular pilot-operated safety relief valve (MPV) features a separate, non-flowing pilot sub-assembly design making it well-suitable for use with both compressible and incompressible fluids. Optional pilot valve constructions offer either pop action or modulating action functionality to meet various pressure range, seat tightness, and blowdown requirements. Highly versatile, this valve technology offers ease of maintenance, high reliability, flexibility, and efficient operation and performance.