Marine Rotary Vane Steering Gear For Vessel
Brand :XIFAN MARINE
Product origin :China
Delivery time :30days
Supply capacity :10pcs/day
The working reliability is guaranteed from the designing, which makes operating the navigation effectively and accurately.
The puise signal during maneuvering can be reacted immediately.
Marine Rotary Vane Steering Gear For Vessel
Rotary vane steering gear is usually fitted with 3 fixed vanes and 3 moving vanes and can turn to 700 of total rudder movement i.e 350 on each side.
– Three fixed and three moving vanes are usual and permit a total rudder angle of 70’, i.e. 35° in each direction. The movement obtainable from a gear with two fixed and two moving vanes, may be 130°.
* The rotor C is fitted and keyed to a tapered rudder stock A, the stator B is secured to the ship’s structure. Fixed vanes, secured equidistantly in the stator bore and rotating vanes secured equidistantly in the rotor, form two sets of pressure chambers in the annular space between the rotor and stator.
* They are interconnected by a manifold. Fluid supplied at pressure to one set of these chambers will rotate C clockwise and the rudder will turn to port, or to starboard if the alternate set is put under pressure.
* The fixed and rotating vanes may be of spheroidal graphite cast iron. They are securely fixed to the cast steel rotor and stator by high tensile steel dowel pins and cap screws. Keys are also fitted along the length of the rotary vanes, for mechanical strength.
* Assembly of the gear would not be possible if the fixed vanes were keyed; they rely on the dowels to provide equivalent strength. The vanes fixing is considered to be of sufficient strength to make them suitable to act as rudder stops. Steel sealing strips, backed by synthetic rubber, are fitted in grooves along the working faces of the fixed and rotary vanes, thus ensuring a high volumetric efficiency, of 96—98% even at the relief valve pressure of 100 bar or over. Rotation of B is prevented by means of two anchor brackets, and two anchor pins. The anchor brackets are securely bolted to the ship.
* Vertical clearance is arranged between the inside of the stator flanges and the top and bottom of the anchor brackets to allow for vertical movement of the rudderstock. This clearance varies with each size of the rotary vane unit, but is approximately 38 mm in total and it is necessary that the rudder carrier should be capable of restricting the vertical movements of the rudderstock to less than this amount.
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