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:
Oct. 06, 1998
Filed:
May. 30, 1997
Gary L Scott, Marshalltown, IA (US);
William Jacob Bonzer, Marshalltown, IA (US);
Frank E Jensen, Marshalltown, IA (US);
Fisher Controls International, Inc., Clayton, MO (US);
Abstract
A pressure unloading pilot operated fluid pressure regulator having a throttling element for controlling fluid flow. A pilot amplifier senses regulator outlet pressure and supplies suitable loading pressure coupled from an inlet supply pressure line through a variable flow restrictor to the throttling element. A check valve has a preset differential pressure defined between the check valve inlet and outlet and is mounted in parallel flow with the flow restrictor to limit the maximum differential pressure across the throttling element to the preset differential pressure of the check valve.