Inventors:
Richard G. Krauth - Fresno CA
Steven P. Brunnengraeber - Clovis CA
Assignee:
Wade Manufacturing Co. - Tualatin OR
International Classification:
B05B 108
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.