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:
Feb. 19, 2008
Filed:
Aug. 06, 2005
Gordon F. Bosley, Cherry Grove, CA;
Bruce Mitchell, Calgary, CA;
Gordon F. Bosley, Cherry Grove, CA;
Bruce Mitchell, Calgary, CA;
G. Bosley Oilfield Services Ltd., Cherry Grove, Alberta, CA;
Abstract
A differential pressure valve has a valve body containing a main piston axially moveable therein to open a fluid inlet to a fluid outlet at preset high pressure and to close at a preset lower pressure. A high pressure trigger piston and a low pressure trigger piston are operable in the main piston to alternately engage and lock the main piston to the valve body in one of the closed and open positions. A ball shifts in a port in the main piston to alternately straddle between at least one annular locking groove in the valve body and a release recess in a respective trigger piston. The ball can shift to alternately reside to straddle the valve body and main piston in the locked position or to straddle the main piston and trigger piston in the unlocked position. The trigger pistons and main pistons are mechanically biased to urge the pistons against the fluid pressure at the inlet.