Monitoring valve, rock drilling apparatus and a method for controlling at least two hydraulic actuators to such a monitoring valve and rock drilling apparatus
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United States of America Patent
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Oct 24, 2006
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app pub date -
Nov 5, 2003
filing date -
Nov 5, 2002
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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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