Browse Prior Art Database

Original Publication Date: 1983-Dec-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


Vacuum corrugated feeders use relief valves to balance and control air flow. In most relief valves the nature of the flow through the valves effects the size of the valve opening and either spring force or gravity is used to act against a vacuum. An improved relief valve 10 is shown in the figure, that is controlled by air pressure. When sufficient vacuum exists on the low pressure side 12 of the valve, a piston 14 begins moving into an open position in the direction of arrow 20. An advantage of this design is that the turbulent air flowing through valve in the direction of arrow 30 does not effect the motion of piston 14 or the size of the vent opening. Hence, the volume of air flow through valve 10 is solely a function of the static pressure at sense hole 18.