Discription
12 Description
The radial piston pumps are applied as controllable hydraulic pumps in combination with mechanical
and hydraulic controllers. The pumps basically consist of a housing, a control journal, a stroke ring,
two control pistons, working piston, slipper pads, a cross-disc coupling, a drive shaft with ball bearing
and line connections for pumping fluid. The controllers can be adjusted by hand, screws or in a
hydraulic way, and have an impact on the control pistons. They can consist of one housing, screws,
springs and seals.
The driving torque is transmitted by the shaft via a cross-disc coupling on the cylinder star, which is
supported on the control journal. The radial arranged pistons within the cylinder star are supported by
slipper pads in the stroke ring. Piston and slipper pad are connected by a ball joint and tied up by a
ring. The slipper pads are driven by two retainer rings within the stroke ring and pressed to the stroke
ring by the centrifugal force during the operation. When the cylinder star rotates, the pistons do a
stroke movement as a result of the eccentric position of the stroke ring. The eccentricity of the stroke
ring is modified by two opposed control pistons within the housing. The control pistons can be
adjusted by mechanical or hydraulic controllers. The oil flow is loaded and conducted by ducts in
housing and control journal. This is controlled by suction- and pressure slot within the control journal.
The pumps usually are driven with mineral oils. But it is also possible to use so called special fluids
like different emulsions, water glycol, isocyanides, polyol and suchlike. The hydraulic fluid is taken
from a related reservoir (not a component part of the pump). Internal leakage or fluid via the safety
valve (not a component part of the pump) is led by a tube- or pipeline back to the reservoir.
The different types of the radial piston pumps differ in style of control of the control pistons
(mechanical / hydraulic), the style of the connections, the used operating fluid, direction of rotation,
style of the driving shaft, mounting flange and operating pressure. The standard type is designed for
280 bar of operating pressure, whereas the high pressure type is designed for 350 bar of operating
pressure.
All essential parts of the radial piston pump and the controllers are made of steel or cast iron. The
pumps have to be protected against dry-running through appropriate monitoring and stopping
activities. These monitoring units are not essential part of the pump.
All external positioned parts of the radial piston pump are related to the device group II category 2 GD,
the interior is protected against the entrance of potentially explosive mixtures by the provided
monitoring units and is not related to any category.
Moog GmbH
Benutzerinformation RKP-II für explosionsgefährdete Bereiche (CA57626, Version 1.3, 12/09)
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