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:
May. 07, 1996
Filed:
Jul. 13, 1994
Ronald J Cortopassi, Peachtree Corners, GA (US);
Lawrence P Schmidt, Lino Lakes, MN (US);
Robert W Shallue, Blaine, MN (US);
Roger N Pearson, Elk River, MN (US);
Schwing America, Inc., White Bear, MN (US);
Abstract
A valve, to control the injection of lubricant into a viscous material pump pipeline is disclosed. The valve is operated off a parameter of the viscous material pump such as hydraulic fluid pressure from one or both differential/popper teed lines for the pump. The preferred valve includes coaxial water and hydraulic oil spools on opposing ends of a rod, and two hydraulic signals are used to control water flow through two outlets, to properly feed water to two lubricant injectors. Inlets and outlets of the valve are all located along one surface, and an intermediate chamber is provided to receive any leakage past the rod seals.