Abstract: A control valve includes a main valve spool movable to a plurality of positions. A detent mechanism with a plurality of operational modes operates to releasably hold the main valve spool in displaced positions. An operator-controlled selector mechanism is coupled to the detent mechanism and is operable to selectively place the detent mechanism in a selected one of its operational modes.

Abstract: A control valve includes a main valve spool movable to a plurality of positions. A detent mechanism with a plurality of operational modes operates to releasably hold the main valve spool in displaced positions. An operator-controlled selector mechanism is coupled to the detent mechanism and is operable to selectively place the detent mechanism in a selected one of its operational modes.

Abstract: A female coupler can operate in both a push-pull and a lever-actuated connect/disconnect fashion. Double lock ball controlling ramp surfaces are provided around the receiving bore of the coupler to allow the lock balls of the coupler to withdraw from the receiving bore when the receptacle is moved either into or out of the housing. The coupler can be moved into or out of the housing by pushing the male coupler into or pulling it out of the female coupler, or by use of a lever-actuated cam. A piston-type flow-check valve is provided to open the male check ball and hold it open despite transient surges. This flow-check valve is hydraulically actuated. A bleed valve for the hydraulically actuated flow-check valve is activated to release the flow-check valve when the lever is actuated or when the receptacle is pushed into the housing, thereby reducing the force needed for coupling.

Abstract: This invention relates to a flow check prevention mechanism especially useful in a female coupler for preventing closure of a male coupler coupled thereto should a vacuum occur in the female coupler when fluid flow out of the female coupler is momentarily blocked. The female coupler includes a housing having a bore formed therein with a receptacle movably positioned within the bore. The receptacle contains a main cavity which is connected by a passageway to an engagement bore. The engagement bore receives the male coupler. Located within the receptacle is a main poppet valve which controls the fluid flow through the passageway and a secondary poppet valve which relieves fluid pressure from the main cavity through an outlet port. The female coupler also includes a movable piston which assists in moving the main valve against excessive pressure which may be contained within the male coupler and a collar member which limits the travel of the main valve.

Abstract: A female coupler for engagement with a male coupler which has a spring loaded check valve, the female coupler includes a main poppet valve biased to a normally closed position and movable by the check valve in the male coupler to a fully opened position, a piston responsive to fluid pressure in the female coupler to force the main poppet valve to an intermediate position and open the male coupler check valve, a flow check prevention valve for normally maintaining a predetermined pressure of the fluid acting on the piston, and a second poppet valve to relieve the fluid acting on the piston.