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A loudspeaker having an electrically actuated valve that modulates a stream of compressed air.



Related Terms

BYPASS VALVE

A valve mechanism that assures system fluid flow when a preselected differential pressure across is exceeded; the valve allows all or part of the flow to bypass the filter element.

BUILT-IN-DIRT

Material passed into the effluent stream composed of foreign materials incorporated into the filter medium.

LOOK BOX

Box with glass windows built into distillation-column rundown lines (or other flow lines) so that the stream of condensate from the condenser can be watched.

JUNCTION BUOY

A buoy which, when viewed from a vessel approaching from the open sea or in the same direction as the main stream of flood current, or in the direction established by appropriate author- ity, indicates the place at which two channels meet.

GRAVITY SETTLING CHAMBER

Chamber or vessel in which the velocity of heavy particles (solids or liquids) in a fluid stream is reduced to allow them to settle downward by gravity, as in the case of a dust-laden gas stream.

EXHAUST VALVE

The valve on a cylinder in an internal combustion engine which controls the discharge of spent gas.

CHECK VALVE

A valve designed to prevent reversal of flow. Flow in one direction only is permitted.

TRAIL FOR PILOT IGNITION

A timed interval when the pilot valve is held open and an attempt made to ignite and prove it. If the presence of the pilot is proved at the termination of the interval, the main valve is energized; if not the pilot and ignition are cut off followed by a safety lockout.

SOLENOID VALVE

Electromagnet with a moving core. It serves as a valve or operates a valve.

CUTOFF VALVE

A valve used to stop the flow of steam to the cylinder of a steam engine.

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