|
(11) | EP 2 009 283 A3 |
(12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
||||||||||||||||||||||||
(54) | Hydraulically driven machine improvement |
(57) A hydraulically driven diaphragm pumping machine comprises a plunger (6) that is
slidably mounted in a middle part of the inside of the machine's hydraulic cylinder
(5) between first and second bellow-like diaphragms (4,10). Ends of the plunger (6)
are connected to the first and second bellows-like diaphragm (10) to define respective
first and second outer annular spaces (a) that are independent of one another, and
the pressure of fluid in the first annular space (a) is independent of the pressure
of fluid in the second annular space (a). The machine may also comprise a hydromechanical
switch for commutating a value (102) to automatically control the supply of hydraulic
fluid to the hydraulic cylinder at given moments of the machine's cycle.
|