Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1979-12-10
1982-11-23
Gluck, Richard E.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
417302, 417304, F04B 4900
Patent
active
043603220
ABSTRACT:
A positive displacement pump system has two delivery passages communicating under the control of a valve with a main discharge passage and/or an overspill duct. The valve is constituted by a valve member slidably mounted in a valve bore and the valve member has lands and intermediate recesses controlling communication between the delivery passages and the overspill duct. The pressures upstream and downstream of a discharge orifice in the discharge passage are applied to the valve member in opposition to each other, increase of the pressure drop tending to move the valve member to increase the amount of fluid passed to the overspill duct. To overcome the known tendency for a valve member to be subjected by the hydraulic forces to a large closing force when the valve is open to only a small extent, the valve is designed to provide for a relatively large opening force at least when the valve is commencing to open. In one construction this is achieved by passing the flow from the second to the main discharge duct through the valve member in a manner producing a jet reaction on the valve member to assist the normal regulating force on the member. In alternative arrangements the additional force is derived from an additional pressure drop induced in the flow from the delivery passage, the higher pressure being applied to valve member in a sense to increase the amount of fluid passed to overspill.
REFERENCES:
patent: 2279176 (1942-04-01), Pardee
patent: 2755741 (1956-07-01), Erskine
patent: 2797550 (1957-07-01), Stelzer
patent: 3366065 (1968-01-01), Pace et al.
Bristow Ian T.
Petts Nigel J.
Gluck Richard E.
Hobourn-Eaton Limited
LandOfFree
Positive displacement pump systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Positive displacement pump systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positive displacement pump systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1877243