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. 30, 1989
Filed:
Nov. 01, 1988
Ernest A DiBartolo, Sarasota, FL (US);
Sun Hydraulics Corp., Sarasota, FL (US);
Abstract
Two pressure control valves have most components in common. One valve is a direct-acting sequence valve and the other a vented counterbalance valve with pilot assist. Both valves have a set opening pressure which is insensitive to secondary port pressure. Both valves may provide free reverse flow. The valves include a spring force reduction chamber which receives hydraulic fluid at primary port pressure. Part of the opening force exerted at the primary port is offset by pressure in the spring force reduction chamber so that a spring having a smaller spring constant may be used to resist opening force. This offsetting force may be readily modified by changing the diameter of the piston shaft of the valve.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile