BELLOWS OPERATED RELIEF VALVE
Original Publication Date: 1983-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Vacuum corrugation feeders use relief valves to balance and control air flow. A relief valve 10 for use in such feeders is shown in the figure that includes a bellows 12. Bellows are common devices which expand or contract at a precise preset rate in response to changes in pressure. As shown in the figure, high pressure in the direction of arrow 20 causes the bellows 12 to contract and make sealing plate 13 open the valve to allow air to flow into the low pressure area.