Pressure/Vacuum Relief Valve (PV Valve) · PV Valves & Vent Systems
Motherwell Tank Protection PV Valve DN200 SS316L Marine is a Pressure/Vacuum Relief Valve (PV Valve) within the PV Valves & Vent Systems category. It is typically installed on cargo-tank or vent piping exposed on deck, forming part of the controlled tank-breathing and over/under-pressure protection arrangement. Its engineering role is to relieve excessive positive or negative tank pressure while remaining closed during normal conditions within the approved operating range. The complete model designation should be retained when matching drawings, certificates, service information and spare parts because neighboring variants may differ in configuration even when they share the same equipment family. The exact shipboard arrangement and interfaces remain installation-specific and should be checked against the vessel’s approved drawings and equipment documentation.
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Inspect the body, seat, moving elements, screens and drains for corrosion, deposits and free movement. Verify set-point behavior only using the approved test method and calibrated equipment. Opening and closing pressures must not be inferred from the model name unless explicitly stated; refer to the manufacturer documentation for the exact figure.
Carry approved seals, seat components, screens, gaskets and other maker-recommended service parts appropriate to the installed valve.
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