Servi Hydranor 50S173 Hydraulic Control Block

The Servi Hydranor Part No. 50S173 is an integrated hydraulic valve manifold assembly engineered for high-pressure fluid power distribution in critical offshore, vessel deck machinery, and subsea actuation systems. Manufactured in Kongsberg, Norway, by Servi Hydranor (now Servi Group), this control block integrates pilot-operated directional logic, overpressure relief, and counter-balance load holding into a single ductile iron monoblock housing.

The 50S173 manifold drastically minimizes leak paths, dampens hydraulic shock waves during rapid directional switching, and preserves system integrity under severe open-deck marine environments subject to dynamic vessel motion, saltwater atmosphere, and vibration.

Key Features

1. High-Integrity Monoblock Construction: Machined from high-tensile ductile iron (EN-GJS-400/500 grade) with salt-spray corrosion protection, rated for continuous working pressures up to 350 bar (5,075 psi) and test pressures up to 420 bar.
2. Integrated Cartridge Cavities: Fully fitted with standard industrial cavity seatings accepting integrated pilot-operated check valves, pressure limiting elements, and proportional or solenoid directional cartridges.
3. Direct Subplate / Flange Porting: Equipped with heavy-duty BSPP (ISO 1179-1) / SAE J518 code 61/62 high-pressure port interfaces, guaranteeing zero-extrusion sealing when coupled with standard fluorocarbon/NBR seals.
4. Zero Leakage & Cleanliness Compliance: Factory-cleaned and verified to ISO 4406 Class 16/14/11 cleanliness standards prior to protective blanking and dispatch.

Applications

• Deck Machinery & Mooring Systems: Tension winch drives, mooring winches, anchor windlasses, and capstan hydraulic brake and clutch activation loops.
• Shipboard Cargo & Access Gear: Hydraulic cargo crane luffing/hoisting blocks, hatch cover ram distribution, and Ro-Ro ramp locking circuits.
• Steering Gear & Thruster Hydraulics: Rotary vane and ram-type rudder steering systems, variable pitch propeller (CPP) pitch control, and bow/stern thruster orientation.
• Offshore Drilling & Subsea Units: Pipe handling cranes, offshore launch and recovery systems (LARS), blowout preventer (BOP) pilot handling panels, and marine riser tensioners.

Compatible Systems & Marine Platforms

• MacGregor Marine Hydraulics: Mooring winches, cargo handling cranes, and hatch operating gear using Hydranor modular valve architecture.
• Rolls-Royce / Kongsberg Maritime: Brattvaag and Rauma winch hydraulic power packs and low-pressure/high-pressure booster units.
• TTS Marine / Pusnes: Deck windlass and positioning manifold circuits.
• Hatlapa / Porsgrunn: Ram-type and rotary vane marine hydraulic steering gear power units.

Part Number Cross-References

• Primary MPN: 50S173
• Servi Hydranor Alternate Ref: 50-S-173 / SH-50S173
• Related Valve Platform Families: Servi Hydranor 5ST648, 1STB44, 3RV32 Series

Frequently Asked Questions

What is the function of the Servi Hydranor 50S173 control block?

The 50S173 is an integrated hydraulic manifold designed to regulate fluid flow, pilot direction, and operating pressure for heavy-duty marine actuators, winches, and steering gear systems up to 350 bar.

Is this Servi Hydranor 50S173 unit brand new?

Yes. This unit is in New, Unused Surplus condition. It has remained preserved in warehouse storage with all port plugs intact and has never been commissioned in live service.

Can this manifold withstand open-deck offshore environments?

Yes. Engineered in Norway specifically for marine and offshore duties, the ductile iron block features high corrosion resistance against marine atmospheric moisture and severe vibration profiles common on ship foredecks and offshore drilling rigs.

What fluids can be used with this control block?

It operates with conventional mineral-based hydraulic oils (HLP 32, 46, 68), synthetic esters, and marine environmentally acceptable lubricants (EALs) within viscosity ratings of 15 to 380 cSt.

How is the manifold packed for international shipping?

Each control block is cleaned, internal cavities treated with a vapor-phase rust inhibitor, all ports sealed with heavy-duty caps, and enclosed in moisture-barrier export crating to ensure zero oxidation during air or ocean transit.