F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/9
F04B 49/02 (2006.01) F04B 49/08 (2006.01)
Patent
CA 1280638
ABSTRACT OF THE DISCLOSURE A dry valve for a gear pump includes a piston having a valve head and a piston head mounted on the opposite ends of a piston rod. The piston is selectively movable between an opened position, wherein hydraulic fluid is permitted to flow from a reservoir to a pumping chamber of the gear pump, and a closed position, wherein such flow is obstructed. A source of pressurized air exerts a biasing force against the piston head to selectively move the piston. An outlet port of the gear pump is connected through a feedback passageway to the dry valve. The feedback passageway communicates with the side of a chamber in which the piston rod of the dry valve reciprocates between the opened and closed positions. When the dry valve is in the opened position, the pressurized fluid from the outlet port of the gear pump exerts a side-loading pressure against the piston rod, causing a frictional force to be generated between the piston rod and the piston rod chamber which resists relative movement. If the frictional force is greater than the biasing force, the source of pressurized air is unable to move the piston to the closed position. Thus, the dry valve may be moved from the opened position to the closed position only if the pressure of the fluid at the outlet port of the gear pump is less than a predetermined maximum safe magnitude. After the dry valve is moved to the closed position, a reduced diameter portion of the piston rod is disposed adjacent the feedback passageway. As a result, fluid is permitted to flow through the feedback passageway and the piston rod chamber to an external drain connected to the reservoir. This structure returns the lubricating and cooling fluid to the reservoir after circulating once through the gear pump.
557487
Eley James M.
Mcburnett James R.
Raina Kuldip
Parker Hannifin Corporation
Ridout & Maybee Llp
LandOfFree
Gear pump having conditional dry valve closure structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gear pump having conditional dry valve closure structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gear pump having conditional dry valve closure structure will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1329581