CONTROL SYSTEM WITH SELECTIVE PRESSURE STAGING

摘要

Control System With Selective Pressure Staging A control system for a spring applied, pressure released brake is provided to control the pressure level in the brake in response to operation of a control valve to stage the pressure levels relative to the operating mode of the control valve. The control system also provides two different fluid pathways that are individually operational to lubricate a winch and draw works mechanism in response to the operating position of the control valve. This system improves the response time needed to gradually release the brake.