OPV P04

Buoyancy Systems · Overpressure Relief Valves

OPV P04

Combines low-profile relief geometry with 600 L/min exhaust capacity for compact integration and dependable overpressure relief, with native compatibility across the P04 Series flange family.
Lid Design:
Relief setting (Cracking Pressure):

CONFIGURATION

Pull knob
Type-C

Nominal opening pressure
≈ 0.18 bar (2.61 psi)

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OPV P04 in side profile, low-profile ribbed lid linked by a corrugated hose to the connector
  • OPV P04 in side profile, low-profile ribbed lid linked by a corrugated hose to the connector
  • Grayscale technical rendering of the OPV P04 face-on, showing lid and hose alignment
  • Exploded view of the P04 valve: lid, coil spring, seat and diaphragm in sequence
  • P04 valve close-up on a quilted fabric panel, Powered by HYDPRO branding ring visible
  • P04 valve mounted on a padded fabric panel, three-quarter angle showing zip trim and dump toggle
  • OPV P04 in side profile, low-profile ribbed lid linked by a corrugated hose to the connector
  • Grayscale technical rendering of the OPV P04 face-on, showing lid and hose alignment
  • Exploded view of the P04 valve: lid, coil spring, seat and diaphragm in sequence
  • P04 valve close-up on a quilted fabric panel, Powered by HYDPRO branding ring visible
  • P04 valve mounted on a padded fabric panel, three-quarter angle showing zip trim and dump toggle

OPV P04 Series

P04 Series Core, low-profile architecture, improved exhaust capacity.

OPV P04: 600 l/m exhaust, conic coil spring, sector gasket plate, 45mm 5-ridge interface

Specifications

Low-profile. Compact by design.

The P04 Series defines a low-profile relief platform for buoyancy and inflatable systems built around the P04 interface. It combines a compact external form with improved exhaust capacity, supporting clean integration in space-conscious layouts. A low-profile platform shaped for compact relief integration.

 Full technical specs (PDF)

Interface architecture. Defined by Series.

Each OPV Series is engineered around a dedicated flange geometry, defining fit, sealing and retention at the buoyancy-device boundary. Lid design and valve configuration vary within the Series; compatibility follows the interface geometry.

Built to integrate. True to your setup.

Whatever the field runs, HYDPRO builds to it natively: every established mount standard, thread, and host geometry, covered from the factory. Your setup stays as it is, integration stays clean, and the response repeats: the same command, the same result, on every dive.

Italian engineering. Predictable control

Each HYDPRO device is engineered and manufactured in Italy: one chain from raw material to release. Polymer families are selected for constant immersion, precision-drawn brass runs on in-house CNC lines, and every device leaves built, tested, and signed off under one roof.
HYDPRO power unit manufacturing: CNC machining, hand assembly, and the finished valve underwater

Proven by divers.
Refined by decades.

Four decades in the water stand behind the current generation. What wears, what binds, what drifts out of tune comes back from real dives to the bench, and the next revision answers it. Control you can feel, refined one generation at a time.

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