(57) A fluid operated pressure oscillation generator of the type which comprises a housing
(10) forming an outlet passage (16) and an inlet compartment (20) surrounding the
outlet passage. An annular seat (11) is formed by the housing between the outlet passage
and the inlet compartment, and a cover (13) detachably mounted to the housing, engages
a diaphragm (12) at the periphery thereof to bias the diaphragm against the seat.
An outlet (25; 30, 30a) for fluid opens into the outlet passage and faces away from
the diaphragm, and means (24; 27) are provided for supplying fluid from the outside
of the housing to said outlet.
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