Abstract: A pressure compensating flow control device includes a generally elongated, collapsible tubular body of flexible material such as silicone rubber having a teardrop shaped inlet orifice for extending into a high pressure supply line, an outlet end for distributing a flow of liquid with the inlet orifice and tubular body collapsible in response to pressure to maintain a generally predetermined uniform flow rate over a predetermined pressure range. The inlet end of the tubular member tapers down to a reduced teardrop inlet orifice with the outlet opening in one embodiment comprising a crescent shaped slit in the wall of the tube.

Abstract: A pressure compensated emitter for irrigation systems and the like includes a generally tubular hard plastic support body for mounting in a port or opening in an irrigation line with a flexible tubular flow control member mounted within the housing with a seal end sealingly engaging a seat in the outlet end of the housing with an inlet port extending toward the inlet opening in the housing with the flow control device being a flexible tubular member having an inlet section of a generally teardrop cross-sectional configuration of a first diameter and a tubular barrel of a second diameter of a generally cylindrical tubular cross section with the inlet section responsive to a first range of pressures and the barrel section responsive to a second range of pressures for regulating and maintaining a substantially uniform flow rate over a range of pressures.