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. 24, 1994
Filed:
Mar. 09, 1993
Richard G Krauth, Fresno, CA (US);
Steven P Brunnengraeber, Clovis, CA (US);
Wade Manufacturing Co., Tualatin, OR (US);
Abstract
A pulsator, adapted for use in irrigation and other systems requiring the uniform discharge of water or other liquids in intermittent pulses and at regular frequencies, comprises a casing having an expansible elastomeric tube disposed therein. The tube is adapted to be exposed to pressurized liquid for movement between contracted and expanded conditions of operation for controlling the intermittent opening of a valve, formed in part by the tube. A flow control, located at the inlet to the pulsator, functions to modulate the pressure of the incoming liquid to control the flow rate of the liquid communicated to an expansible chamber defined in part by the tube. When the pressure in the chamber exceeds a predetermined level, the valve will open to intermittently discharge pulses of liquid to a distributor, such as an irrigation sprayer. The pulsator is preferably structured to insure continuous communication of liquid from the inlet to the pulsator to the chamber. Further, the normally closed valve preferably comprises an annular contact surface defined circumferentially on an annular flange that normally engages the tube in at least near line contact to induce near-instantaneous opening of the valve during a pulsating cycle.