Pressure/Vacuum Relief Valve (PV Valve) · PV Valves & Vent Systems
Pres-Vac PV Valve DN50 SS316L Marine — PV Valves & Vent Systems. As a Pressure/Vacuum Relief Valve (PV Valve), it is normally installed on the cargo-tank vent system or vent riser where tank pressure and vacuum are relieved to protect the tank structure. In that role, its primary purpose is to open automatically when tank pressure or vacuum reaches the approved operating threshold and reseat when conditions normalize. Compared with a normal isolation valve, a PV valve is a calibrated protective device whose seating, freedom of movement and approved set point are safety-critical. For exact ratings, dimensions, settings, capacities, materials and variant-specific limits, refer to the manufacturer documentation for the exact figure.
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What our service work and the manufacturer documentation say about keeping this model running.
Inspect valve body, seat, moving element, seals, vent outlet and flame screen where fitted for cleanliness, corrosion and free movement. Keep cargo residue from affecting seating surfaces and verify service or test certification. Do not alter weights, springs or settings without an approved procedure. Refer to the manufacturer and vessel documentation for the exact figure for pressure, vacuum and leakage criteria.
Carry compatible seals, seat service parts, gaskets, approved moving-element components and cleaning materials identified by the manufacturer.
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