Simran RPU80 instruction manual Valve block, Gear pump, Suction valves on outlet C, Slide

Simrad Reversible Pump RPU80/160/300

3.3 Valve block

This is an aluminum block with borings for non-return valves, suction valves, slide, gear pump, motor coupling and all necessary oil ways. The three outlets A, B and C are positioned on top of the valve block.

3.4 Gear pump

This comprises of the driving gear wheel, which is coupled to the motor shaft via a flexible shaft coupling, and meshed with the driven gear wheel supported by the valve block (1) at one end and by the pump cover (5) at the other.

The gear wheels run in the pump housing. The gear wheels are 1/100-2/100 mm smaller than the pump housing.

O-rings are fitted to both the valve block and the pump cover to provide oil tight seals on both sides of the pump housing.

The pump cover is held by 4 screws (25).

When the gear wheels rotate, oil is carried in the inter-tooth spaces around the periphery of the pump housing from the suction side to the pressure side.

3.5Pressure operated non-return (check) valves on outlet A and B

These are screwed into the valve block from both sides. The valve comprise of valve housing (6), plug (7), ball (12), spring (8), copper washer (17), O-ring (13) and copper washer (14). The housing and plug are made of stainless steel.

3.6 Suction valves on outlet C

These are connected to both sides of the gear pump via oil ways in the valve block. The valve comprises of a grub screw (21), spring (9) and ball (20).

If the grub screw (21) is removed, it should be refitted with Loctite 542 after degreasing the threads.

3.7 Slide (10)

This is located within the valve block in a cylindrical run between the non-return valves for outlets A and B. The slide is grooved to allow location of an O-ring (13).

16 20220422N

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