Sound emitter - Operating valve

From International Dictionary of Marine Aids to Navigation
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3-2-120

Operating valve (of a compressed-air sound emitter)

The valve controlling the admission of compressed air to the device which modulates the sounding air.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM