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:
Nov. 25, 1980
Filed:
May. 21, 1979
Ronald B Walters, Wembley, GB;
Sperry Corporation, Troy, MI (US);
Abstract
A fluid flow sensor comprises a hollow spool (58) displaceable on a spindle (66) against a spring (68). A sharp peripheral edge of a peripheral bead (80) on the spool (58) co-operates with the wall (61) of a throat (60) to form an annular flow path between chambers (92 and 90) in a housing (28) as the spool is displaced by the fluid pressure difference between the chambers (92 and 90). In the illustrated resting position of the spool (58), the peripheral bead (80) seats against a valve seat (57) and a residual flow path between the chambers (90 and 92) is provided by a small bleed orifice (89) in the wall of the spool. The pressure difference between the chambers (92 and 90) provides a measure of the fluid flow rate over a very wide range of flow rates. In a modification, the bleed orifice is pre-adjustable.