Crosby JBS-E

Crosby JBS-E

The Crosby™ SIL 3 pneumatic actuated pressure relief valve is a high performance instrumented solution providing on demand actuation as part of a Safety Instrumented System (SIS) or Controlled Safety Pressure Relief System (CSPRS) reducing the need for emergency blowdown valves, associated piping and additional construction cost.

In addition, the Crosby JBS-E PRV provides standard pressure relief valve protection of the system in the event of an overpressure condition.

Any questions?

Henna Ketoja
Inside Sales Engineer
Mob. 400 612 124

Aleksei Seleznev
Inside Sales Engineer
Phone. 040 530 2017

Tommi Penttilä
Sales Manager Conventional Power
Phone. 0207 416 208

Sizes 1" D 2" to 12" W 16" 25 D 50 to 200 T 250 (EN Type)
Orifices 0.110 to 60.75 in2 [71 to 39.193 mm2]
Inlet ratings ANSI Classes 150, 300, 600, 900, 1500, 2500
EN Classes PN 10, PN 16, PN 25, PN40
Temperature range -450°F to 1000°F [-268°C to 538°C]
Set pressure 25 to 6000 psig [1.75 to 413.79 barg)
Operating pressure Maximum allowable: 120 psig [8.3 bar]
Minimum recommended: 13 psig [0.9 bar]
Operating temperature limits Standard construction (Viton® O-rings): -15°F to 400°F
[-26°C to 204°C] other materials on request
Pressure connection ½ NPT internal (standard) for instrument air.
(consult factory for other connections)
Sizing Actuators are sized according to valve selection


  • Standard direct spring operated pressure
    relief valve which can be opened on demand
  • Pneumatically operated actuator controlled by pressure, temperature or other remotely sensed process variable
  • Direct inline loading of valve spindle without the use of levers or cams
  • Capable of fully lifting the relief valve independent of process pressure at valve inlet
  • Remote valve lift indication
  • Operation with standard air supply
  • Rugged actuator construction utilizing Stainless materials
  • Available with a wide variety of monitoring options including TopWorx™ GO™ Switchs and Fisher™ position transmitters
    • Certified as a total final element solution for
    SIS – SIL 3 Capable per IEC 61508

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