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:
Aug. 28, 1990
Filed:
Aug. 30, 1988
Robert S McCarty, Phoenix, AZ (US);
Allied-Signal Inc., Morris Township, NJ (US);
Abstract
Methods for metering fluid flow and apparatus adapted for use with the methods. The apparatus (5) comprises an electrohydraulic solenoid (6) secured to and in fluid communication wiht a metering valve body (8). A cylindrical spool (15) is disposed in a channel (16) formed in the valve body (8), and variably blocks a flow path (74,90,75) extending through the valve body in response to variations in fluid pressure in a chamber (68) which is defined by the solenoid (6), the valve body (8), and the spool (15). Fluid is delivered to and vented from the chamber (68) through the solenoid (6), and the pressure in the chamber varies with the duty cycle of pulses communicated to the solenoid (6).