Panasonic PT-DZ12000U Operating Instructions Manual page 144

Vacuum Receiver Tank - Container in which gas is stored
under vacuum as a source of pneumatic fluid power.
Accommodates sudden or unusually high system demands.
Prevents frequent on/off cycling of an air compressor or
vacuum pump and absorbs pulsations.
Regulator - Device to control flow of gases, thus controlling
the magnitude of the force and torque produced by the
actuator.
Standard Air - Air at a temperature of 68 F, a pressure of
14.70 psia, and a relative humidity of 36 percent.
Vacuum - A space containing air or other gas at less than
atmospheric pressure; usually expressed in "Hg.
Vacuum Gauge - Device for determining the pressure level in
a partial vacuum.
Vacuum Pump - A device that pulls air out of a closed
container or system.
Vacuum Relief Valve - A valve that controls system vacuum
level. It operates by providing a modulated flow of
atmospheric air into the system.
Volumetric Efficiency - The ratio of a pump's actual delivery
to its computed fluid delivery multiplied by 100 percent.
The author expresses gratitude to the Gast Manufacturing
Corporation who provided much of the information in this
section.