Patent ID: 8602748
Filing Date: 2013-12-10
Classification: F04C

Abstract:
1. A pumping system comprising: a variable-displacement vane pump and a user device connected to said variable-displacement vane pump by a delivery conduit; pressure control means for setting said variable-displacement vane pump to a balanced configuration to supply an oil flow demanded by said user device, wherein said pressure control means comprises hydraulic dissipating means for imparting to the oil in a first control chamber forming part of said variable-displacement vane pump, a pressure lower than a control pressure in a second chamber; said variable-displacement pump further comprising a ring which houses a rotor having vanes which are movable radially inside respective slots formed in said rotor; and a channel connecting said first control chamber to an oil inlet permanently at atmospheric pressure; said ring comprising a projection having a nose projecting inside said first control chamber, wherein movement of the ring causes said nose to selectively close said channel.