F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/84
F15B 15/14 (2006.01) F15B 9/03 (2006.01) F15B 13/043 (2006.01)
Patent
CA 1180639
FLUID PRESSURE DEVICE ABSTRACT A fluid pressure device wherein a relatively low powered analog electrical signal readily controls the posi- tion of the output member of a fluid pressure powered actu- ator which in turn can be used to exert mechanical forces or operate mechanical devices such as fluid pumps, motors or valves. Inlet and outlet passages communicate a pres- sure chamber to high and low pressures respectively. A control element totally within the chamber so as to have balanced pressure forces thereon and made of a magneti- cally sensitive material is moved to a fixed position in the chamber by an externally generated magnetic field. At least one of the passages moves with an output member of the actuator so as to be opened or closed by the control element relative to the other passage. The output member follows the control element automatically varying the pres- sure in the chamber to compensate for any variations in the external forces thereon. Alternatively, the output member includes a rod like element having a port in its side for one of the pas- sages and the control element is a sleeve surrounding the rod and can be moved by any externally controlled means including the magnetic field or an external mechanical interconnection.
365948
Brundage Robert W.
Gowling Lafleur Henderson Llp
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