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Library› Engine Room› Steering Gear› Rotary Vane Steering Gear› Parker Hannifin Corporation Parflex Division Parflex 573HVN, 573LZN, Parflex 575LHN, Parflex 575HVN
Parker Hannifin Corporation Parflex Division

Parflex 573HVN, 573LZN, Parflex 575LHN, Parflex 575HVN

Rotary Vane Steering Gear · Steering Gear

Class-certified type (DNV register) · technical data sheet not yet verified

Parflex 573HVN, 573LZN, Parflex 575LHN, Parflex 575HVN by Parker Hannifin Corporation Parflex Division. DNV TA certificate TAP00000A2.

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Inspection

Inspector Detail

Common issues

  • External abrasion or chafing of the hose cover from rubbing against structure or other pipework
  • Hose end fitting leakage from vibration loosening or improper assembly
  • Cover stiffening, cracking or blistering from age, heat or hydraulic fluid incompatibility
  • Kinking or excessive bend radius reducing hose life and flow
  • Internal delamination not visible externally, sometimes only revealed by pressure loss or fitting weep
  • Incorrect hose specification used as a replacement, exceeding the system's working pressure

Inspection checklist

  • Visually inspect the full hose length for cuts, abrasion, cracking, blistering or exposed reinforcement
  • Check hose end fittings for leakage, corrosion and secure crimping
  • Verify hose routing is free of sharp bends, chafe points and excessive movement
  • Confirm hose date-of-manufacture/expiry marking against class/maker replacement policy
  • Function-test the steering gear through full rudder travel and check for pressure drop or erratic movement
  • Check hydraulic fluid cleanliness and level in the steering gear system
  • Inspect hose clamps and support brackets for security
  • Confirm any replacement hose matches the original pressure rating and type approval

Service intervals

Visual hose inspectionat each steering gear routine check, typically weekly to monthly per the SMS
Hose replacementper class/maker recommended service life or at first sign of degradation - confirm against maker manual and class requirement
Fitting/crimp integrity checkat each dry-docking or major steering gear overhaul

Critical spares

  • Replacement hydraulic hose assemblies matching the original pressure rating and type approval
  • Hose end fittings and crimp ferrules matched to the hose maker
  • O-rings and seals for hose connections

Safety

  • High-pressure hydraulic fluid injection injury risk from pinhole leaks - never check for leaks with bare hands
  • Stored hydraulic energy in the steering gear system - depressurise before disconnecting hoses
  • Sudden rudder movement risk during function testing - clear the steering flat and coordinate with the bridge
  • Hydraulic fluid slip and fire hazard where hoses are routed near hot exhaust components

Class survey

Class typically checks that steering gear hydraulic hoses carry a valid type approval matching the installed pressure rating, and reviews the SOLAS Ch. II-1 steering gear test record (full rudder travel, changeover between power units); hose replacement records are commonly requested at renewal survey.

Classification

DNV type approval

Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.

CertificateTAP00000A2
Open the certificate at DNV
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