The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2015
Filed:
Mar. 15, 2012
Corey K. Quinnell, West Allis, WI (US);
Joseph L. Pfaff, Wauwatosa, WI (US);
Jonathan M. Starkey, Glossop, GB;
Eric P. Hamkins, Waukesha, WI (US);
Corey K. Quinnell, West Allis, WI (US);
Joseph L. Pfaff, Wauwatosa, WI (US);
Jonathan M. Starkey, Glossop, GB;
Eric P. Hamkins, Waukesha, WI (US);
HUSCO International, Inc., Waukesha, WI (US);
Abstract
A valve assembly has a flow summation node coupled to a displacement control port of the first pump. Each valve in the assembly has a variable metering orifice controlling flow from an inlet to a hydraulic actuator and has a variable source orifice conveying fluid from a supply conduit to a flow summation node. The source orifice enlarges as the metering orifice shrinks. Each valve includes a variable bypass orifice and the bypass orifices of all the control valves are connected in series forming a bypass passage between a bypass node and a tank. The bypass node is coupled to the flow summation node and receives fluid from a second pump. At each valve, a source check valve conveys fluid from the supply conduit to the inlet and a bypass supply check valve conveys fluid from the bypass passage to the inlet.