Simran RPU80 instruction manual Principle of operation ref. -1 and figure

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Description of RPU80/RPU160/RPU300

3.2Principle of operation (ref. figure 3-1 and figure 9-1)

RPU80/160/300 is reversible: that is the motor changes direction of rotation and the gear pump delivers oil to that side of the rudder cylinder dictated by the signal from the autopilot. The pump runs until the signal from the autopilot ceases. The pump unit has non-return valves on the outlets A and B. When running, the pressurized (or delivery) side will hold both non- return valves open, using direct oil pressure upon the valve on the delivery side. This oil pressure is also used to push a slide to open the valve on the suction side.

When the motor stops, the spring (8) in the non-return valve on the suction side returns the slide to the neutral position. Both non-return valves are now closed and the rudder cylinder locked. Both sides of the gear pump have suction valves to outlet C.

If the rudder cylinder is loaded in the same direction as the rudder command, the slide (10) precisely positions the non- return valve (suction side) such that the creation of a vacuum in the rudder cylinder is prevented. (A vacuum in the rudder cylinder would result in air being drawn past the seals round the cylinder piston rod, since these stops the oil pressure only). At that side of the valve block where the motor is connected, there is mounted sealing ring (15) and support ring (16) in the valve block. The support ring causes that the tank connection C can hold a maximum pressure of 7 bar (Ref. Hynautic steering systems).

Note !

1.A previous model of RPU80 Reversible Pump was simplified according to the principle diagram. (Ref. figure 3-1 and figure 9-2). The principle of operation was similar to that of RPU160. The (suction) valves, however, operated as combined suction and non-return (check) valves controlled by internal pressure and direction of oil flow. The resulting effect was a smoother non-return (check valve) function as compared to the one with separate non-return valves.

2.It should be observed however, that the previous model of RPU80 does not have the extra protection against internal leakage (bypass) as the other models with separate check valves.

20220422N

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Contents Simrad RPU80/160/300 Reversible Pump Copyright 20220422N Document revisions Contents Technical Specifications General Introduction20220422N Bosvik Norwegian RPU160 RPU300 BCS ItalianCapilano, Flexatrol Canadian. See Seastar Harmek Norwegian HC HYDRO-CONTROL GermanLecomble & Schmitt France RPU160 RPU300 HynauticSeipem Italian RPU160 RPU300 Lecomble & Schmitt Old modelsSLEIPNER, Hydrive Norwegian RPU160 RPU300 Servi NorwegianTeleflex See Seastar Tenfjord Norwegian Vetus DutchWagner Canadian RPU160 RPU300 VetusMeasurements and Calculations for Applying the RPU Calculation of cylinder volumeMinimum rudder time adjustment Capacity nomogram for Reversible Pump RPU80/RPU160/RPU300 Construction Description of RPU80/RPU160/RPU300Principle of operation ref. -1 and figure Gear pump Valve blockPressure operated non-return check valves on outlet a and B Suction valves on outlet CPipe connections Mechanical Installation InstallationInstallation of pipes Connection to expansion tank Connection to hand hydraulic steering gear J3000X, J300X, J300X-40, J50, J50-40 AC10, AC20, AC40 Electrical installationOil filling and bleeding Preparation and TestingTesting Electric motor MaintenanceDismantling Pump motor is not running/not responding to rudder command Fault TracingPiston rod does not move with rudder commands Excessive noise from the pump unitPiston rod of the rudder cylinder does not move smoothly Steering wheel is turning while pump unit is operatedSmall and sudden heading changes while on automatic steering Activator reduces the hardening time to 1 hour Rudder moves only in one direction with pump runningSpecifications Technical SpecificationsDimensions RPU80 performance RPU300 performance RPU160 performancePos Qty Gear pump parts Spare PartsRPU80/RPU160/RPU300 Parts for Fracmo motors Motor parts LemacPos Qty Gear pump parts Previous RPU80 model RPU80 Previous model gear pumpEurope Sales and Service Worldwide