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The purpose of the cylinder head safety valve is to indicate and relieve excessive high pressure in the cylinder to protect the engine from being damaged.



Related Terms

BLOWBACK

The number of pounds per square inch of pressure drop in a boiler from the point where the safety valve pops to the point where the safety valve reseats.

SAFETY VALVE

A valve that automatically opens when pressure attains the valve setting which is adjustable; used to prevent excessive pressure from building up.

SAFETY VALVE DRAIN

A hole of at least 3/8 in diameter required through the body below the valve-seat level in safety valves larger than 2-in diameter; used to prevent condensate from collecting at this point.

SAFETY VALVE ESCAPE

A pipe conducting steam discharged from a safety valve to a safe location.

SAFETY-VALVE LIFTING LEVER

A lever by which safety valve may be lifted from its seat.

SAFETY-VALVE MUFFLER

A silencer designed so that it will not cause appreciable restriction to steam flow.

SAFETY-VALVE NOZZLE

A flanged nozzle by which a safety valve is connected to a boiler shell or drum.

CYLINDER HEAD

Plate or cap which encloses compression end of compressor cylinder or combustion chamber of engine.

POPPING PRESSURE

Pressure at which a safety valve opens.

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