| 摘要 |
2108783 9313866 PCTABS00024 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 (11) having an expansible elastomeric tube (18) 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 (20), formed in part by the tube. A flow control (21), 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 (19) defined in part by the tube. When the pressure in the chamber exceeds a predetermined level, the valve (20) will open to intermittently discharge pulses of liquid to a distributor, such as an irrigation sprayer.
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