Vent control for cylinder mounted load check valves

Abstract From the Canadian patent

Abstract of the Disclosure, A fluid source delivers fluid to a control valve having Float, First direction and Second direction positions. A piston-bore check valve allows flow to the motor and normally blocks reverse flow, the piston having its first end biased against a seat. Flow is restricted between the motor's first end and a control chamber which communicates with the piston's second end. A full flow path between the motor's first end and the bore provides a force acting against the piston's first end. A drain valve entry port communicates with the motor's first end and an exit port thereof communicates with a sump to provide either entry port-exit port connection or blocking. A …