4900 Series MPV Modular Pilot Operated Safety Relief Valve

Consolidated 4900 Series MPV Modular Pilot-Operated Safety Relief Valve

Inlet Sizes

1″ to 8″ flanged

Inlet Ratings

ASME Class 150 to 2500 ​​​​​​

Outlet Sizes

2″ through 10″ flanged

Outlet Ratings

ASME Class 150 to 300

Orifice Sizes

D through T, Full Bores

Set Pressure Range

15 psig to 7200 psig

Temperature Range

-40°F to 505°F


Stainless steel pilot with carbon steel main valve and stainless steel trim. Other materials available

Standards and Regulations

ASME B & PVC, Section VIII

Pressure Equipment Directive


The Type 4900 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.  Key features and benefits of the 4900 Pilot Operated Safety Relief Valve include:

  • Modular design is easy to install, operate, and maintain.
  • Tubing and fittings are eliminated for simple assembly and disassembly, in addition to fewer leak paths.
  • Streamlined design addresses issues of tubing damage potentially caused by harsh environments and rough use.
  • Top-entry design offers easy access to the main valve components for reduced maintenance and operating costs.