A safety device, such as a metal mesh protector, to prevent an exhaust backfire from causing an explosion; operates by absorbing heat.


Related Terms

POPPET VALVE

A cam-operated or spring-loaded reciprocating-engine mushroomtype valve used for control of admission and exhaust of working fluid; the direction of movement is at right angles to the plane of its seat.

PISTON VALVE

A cylindrical type of steam engine slide valve for admission and exhaust of steam.

MERCER ENGINE

A revolving-block engine in which two opposing pistons operate in a single cylinder with two rollers attached to each piston; intake ports are uncovered when the pistons are closest together, and exhaust ports are uncovered when they are farthest apart.

JUNKERS ENGINE

A doubleopposed-piston, two-cycle internal combustion engine with intake and exhaust ports at opposite ends of the cylinder.

CATALYST

A substance which speeds a chemical action without undergoing a chemical change itself during the process. Now used in catalytic converters to control amount of unburned hydrocarbons and CO in automobile exhaust.

TURBINE RELIEF VALVE

The turbine casing is fitted with spring-loaded relief valves to prevent damage by excessive steam pressure at the low-pressure end if the exhaust valve is closed accidentally. Some casings on smaller turbines are fitted with a sentinel valve, which serves only to warn the operator of over-pressure of the exhaust end. A spring-loaded relic valve is needed to relieve high pressure.

OPEN CYCLE

A gas turbine system where the gases exhaust to atmosphere.

INDUCED DRAFT FAN

A fan exhausting hot gases from heat absorbing equipment.

NITROGEN DIOXIDE

Mildly poisonous gas (NO2) often found in smog or engine exhaust

MUFFLER

A device used for quieting exhaust air

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