(57) A fluid motor (97) is set into the return flow of a hydraulic or pneuma-machinery.
This fluid motor (97) has a relatively large consumption capacity to revolve at low
speed, but it can be a low pressure motor. The motor (97) is utilized to revolve or
oscilate one or more control devices which may be used to control the operation of
the machinery with the return flow whereinto the fluid motor (97) is set. Specific
additional matters are then proposed to secure the smoothly timed and reliable operation
of the fluid motor and of the controller(s) which it drives.
This control arrangement with the fluid motor (97) in the return flow fluid line may
be utilized to control the operation of a high pressure pump. This pump may have medial
pressure (8, 9) and high pressure (5, 6) pistons, reciprocating in respective cylinders,
as well as inner- and outer- chambers with deflectible separators (58) between these
chambers in order that the outer chamber may contain a lubricatious fluid while the
inner chamber can then contain a non-lubricative fluid, as for example, water.
The fluid motor (97) in the return fluid line may be replaced by another motor, for
example, an electric motor with a reduction gear, to enforce a low speed operation
of the control device(s). If the apparatus of the invention is a complete use of all
details of the invention, a pump can provide a flow of water with pressures in excess
of 30 000 psi.
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