Pressure/Vacuum Relief Valve (PV Valve) · PV Valves & Vent Systems
Pres-Vac PV Valve DN250 2100mbar — PV Valves & Vent Systems.
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| Visual inspection | per PMS, typically at each port call or monthly |
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| Function test / lift check | before cargo operations, and per the vessel's vent system survey schedule |
| Set pressure verification (bench test) | at drydocking/special survey, or per class interval |
| Overhaul (pallet, seat, seals) | condition-based, commonly every 2.5-5 years |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Set pressure drift | renew/reset if the verified set pressure deviates from the nameplate beyond the tolerance stated in the valve's test certificate - no generic figure, use the bench test result |
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Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Cargo tank PV valves are checked at each relevant tanker/cargo ship survey for correct set pressure, free movement and flame screen condition where fitted; class will normally want a valid bench test or manufacturer service certificate confirming the set pressure.
Estimated lifetime: PV valves are serviced on a calendar/survey basis rather than running hours; a typical overhaul interval is at drydocking or special survey, roughly every 2.5-5 years, condition and cargo service dependent
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