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: 217Kgm at 35° of the rudder (with working pressure)
Force: 1473Kg (with working pressure)
Tiller arm radius: 200 mm
Piston rod: Diam. 25mm
Cylinder tube: 50mm / 60mm
Ball joint: 18mm
Standard fittings: 3/8″G or 12mm