Air foam tube orifice - has orifice from yielding material with opening smaller than first swirl orifice

摘要

A nozzle carrier (1) is connected to the foam supplying tube by strust (2) and contains a swirl orifice (3) with vanes (5). Behind the orifice (3) further orifice (6) is fitted made from elastic yielding material. The parts are kept in place by securing ring (7). During the operation the fluid pressure acting on the yielding material orifice reduces the wall thickness of the orifice to reduce its opening diameter, which results in pressure limiting. The additional orifice can be designed to be suitable for fitting to existing nozzles by an adaptor.