| 摘要 |
<p>A temperature insensitive, low cost, pressure regulating and remotely flushable emitter for drip irrigation systems comprises a nodal body insertable into the wall of a pipe and having an end face aperture in which a deflectable resilient element responds to interior water pressure changes. The resilient element is deflectable normally to the plane of the end face, and provides at least one edge surface in facing, shearing relation to the end face aperture wall. In a first mode, one or more slit apertures decrease in area in response to increases in interior water pressure within a nominal operating range. When the pressure is raised further, however, the resilient element is deflected across the end face aperture wall, to define at least one slit aperture providing a low volume but high velocity flow which creates a flushing or cleaning action. In a preferred form of structure, the end face of the nodal body is substantially parallel to the flow direction in the pipe and is thicker than the resilient strip, which has at least a double curvature that provides controlled deflection. Water flow along the pipe and the short path length through the aperture tend to prevent clogging, reducing the need for filtration equipment. The emitter is small in size, being less than one-half inch in diameter, is firmly seated within the pipe, is readily manufactured to precise specifications in high volume, and may be easily inserted and replaced.</p> |
