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The pressure at which a check valve will start to open.



Related Terms

MUD OR LOWER DRUM

A pressure chamber of a drum or header type located at the lower extremity of a water- tube boiler convection bank which is normally provided with a blowoff valve for periodic blowing off of sediment collecting in the bottom of the drum.

DIRECTIONAL CONTROL SERVO VALVE

A directional control valve which modulates flow or pressure as a function of its input signal.

COMPRESSOR VALVE

A valve in a compressor, usually automatic, which operates by pressure difference (less than 5 pounds per square inch or 35 kilopascals) on the two sides of a movable, single-loaded member and which has no mechanical linkage with the moving parts of the compressor mechanism.

BALANCED ARMATURE UNIT

Driving unit used in magnetic loudspeakers, consisting of an iron armature pivoted between the poles stair flight. ing winder. A valve having equal fluid pressure in both the opening and closing directions.

SET PRESSURE

Maximum pressure controlled by relief valve. At this pressure relief valve starts releasing a pressure.

PRESSURE RELIEF VALVE

A spring loaded valve with preset activation pressure used to limit maximum pressure in hydraulic or pneumatic system and protect it from overpressure and damage.

SUCTION PRESSURE REGULATOR

An automatic valve designed to limit the suction pressure to prevent compressor overload.

DRAPER EFFECT

The increase in volume at constant pressure at the start of the reaction of hydrogen and chlorine to form hydrogen chloride; the volume increase is caused by an increase in temperature of the reactants, due to heat released in the reaction.

LIFTING DEVICE

A device to manually open a pressure relief valve by decreasing the spring loading in order to determine if the valve is in working order.

PRESSURE RELIEF DEVICE

A valve or rupture member designed to relieve excessive pressure automatically.

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