Air powered hydraulic jack with static line air pressure shift control

摘要

An air powered hydraulic lift system including a hydraulic pump operably connected to the ports of a hydraulic lifting cylinder, the hydraulic pump being driven by an air motor, an air pressure pilot operated valve for controlling supply of hydraulic fluid from the hydraulic pump to the ports of the hydraulic cylinder and an air pressure control valve connected to the air motor and to the air pressure pilot operated valve to supply air pressure to the air motor when air is supplied to the air pressure pilot operated valve.