Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Reexamination Certificate
2006-10-24
2006-10-24
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
C060S422000
Reexamination Certificate
active
07124578
ABSTRACT:
The invention relates to a method for controlling at least two hydraulic actuators, to a monitoring valve and a rock drilling apparatus. The monitoring valve (10) is connected to the input channel of a first actuator through a sensing channel (9) and controls a load-sense circuit (6′) of a second actuator. The pressure of the load-sense circuit (6′) is set by a force of a spring element (12) and biased by a control element (42) of the monitoring valve with differential pressure sensing.
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Official Action issued in the Finnish Priority Application No. 20021980.
Leslie Michael
Look Edward K.
Sandvik Tamrock OY
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