NS 93R-2: Primary Pressure Regulators

Common issues

• Regulator diaphragm/seal wear causing regulated pressure to drift or become unstable
• Internal spring fatigue letting the set pressure creep out of range over time
• Contamination or debris in the hydraulic/compressed-air supply causing the valve to stick
• External leakage at body joints or seals
• Set-point drift requiring more frequent re-calibration than expected

Inspection checklist

• Check regulated downstream pressure against the gauge/nameplate setting under both static and dynamic (helm movement) conditions
• Inspect for external leaks at the body, adjustment screw and connections
• Check the upstream filter/strainer for contamination
• Function-test any relief/bypass action built into the regulator
• Verify mounting security and pipework support, as vibration can loosen fittings
• Cross-check regulator performance against the steering gear's overall response/rudder speed test

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Regulator seal/diaphragm kit
• Upstream strainer element
• Body joint gasket set

Safety

• Stored hydraulic/compressed-air pressure - depressurize and lock out before dismantling
• A regulator failure directly affects steering gear performance and should be treated as relevant to the steering redundancy test, not a minor auxiliary item
• High-pressure fluid injection injury risk from leaking joints under pressure - never check for leaks with bare hands

Class survey

Note: this catalog entry is filed under 'Rotary Vane Steering Gear', but the product name ('Primary Pressure Regulators') indicates a pressure-regulating valve, likely a component within a steering gear hydraulic or associated compressed-air circuit rather than the steering gear unit itself - the notes above address the regulator component. Steering gear pressure regulation is checked as part of the annual steering gear test and the rudder response/changeover test under SOLAS V/26 and class requirements.