| 摘要 |
<p>A disk brake circuit for the draw works of a crane having a first hoist drum and a pump, comprising a disk brake having a caliper engageable with a rotor attached to said drum, a brake valve capable of modulating pressure from said pump to said caliper in response to a control pressure, a displaceable spool for generating a control pressure for said brake valve, an accumulator connected to the charged by said pump, and means responsive to loss of pump pressure for directing accumulator pressure to said brake valve as a control pressure and as a modulated pressure to restrain said drum. </p> |
