Pilot-Operated Pressure Relief Valves Limitations on Use

Corrosive or Fouling Fluids
Flow paths through the pressure-sensing tubing and the pilot valve of a pilot operated pressure relief valve are generally quite narrow, and therefore subject to plugging. Consequently, pilot-operated pressure relief valves should generally not be selected for installations in which service fluids are corrosive, dirty, viscous, or polymerizable.

In addition, one distinct disadvantage to pilot-operated PSVs is that, if the sensing tubing comes loose due to vibration or thermal cycling, the result can be an undesirable full flow.

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