The inboard hydraulic cylinder (actuator) type CL.0-78N-FB is used for servo assisted steering systems.
The cylinder tube is made of brass, a material which has higher resistance to pressure than aluminium.
Double seals are inserted on each cylinder head to compensate the micro leaks which occur after many working hours.
To facilitate the bleeding of air, inclined bleed screws are installed on top of the cylinder heads.
The piston rod is made of stainless steel, chromed and rectified; the chromium plating in a protected environment guaranties a high quality plating, and an excellent protection against the marine corrosion, combined with a very smooth surface guaranties a long endurance of the seals.
The chromium helps to eliminate at least 30% of the friction caused by the use of seals and its hardness protects the piston rod from accidental scratches which could damage the seals.
The support is made of brass.
It is made up of a main cylinder and a feedback cylinder which are coaxial and with the same strokes.
During the FU mode, the feedback cylinder is filled by the manual transmitter, its pressure activates the servo valve which consequently manoeuvres the main cylinder.
The control is step by step and direct.
In NFU mode, the main cylinder is manoeuvred directly by a solenoid valve, while the feedback cylinder is set in bypass through the simultaneous command of a second solenoid valve.
In Manual/Emergency mode, the main cylinder is manoeuvred directly by the manual transmitter, while the feedback cylinder is set in bypass by its antishock valve.
Torque: 502Kgm at 35° of the rudder (with working pressure)
Force: 2611Kg (with working pressure)
Tiller arm radius: 260 mm
Piston rod: Diam. 30mm
Cylinder tube: 65mm / 80mm
Ball joint: 25mm
Standard fittings: ½”G or 18mm.