Valves and valve actuation – Lost motion between actuator and valve
Patent
1975-03-24
1976-07-20
Klinksiek, Henry T.
Valves and valve actuation
Lost motion between actuator and valve
251158, F16K 3144
Patent
active
039702812
ABSTRACT:
A vacuum valve comprises a housing having an inlet passage and a discharge passage with a valve seat defined within the housing between the inlet and discharge passages. A valve disc is engageable on the seat to close off the communication between the valve inlet passage and the discharge passage. An extension is formed on the top face of the valve disc adjacent each side edge and a lever member has an arm portion at each side which engages through the extension and which is receivable in a groove defined in the housing above the valve seat. A valve drive member is connected to move the valve disc toward and away from its seat and during the closing movement it acts on the lever member centrally to cause the outer arm portions to move outwardly and engage into the receiving groove and to both hold the valve against withdrawal from the valve seat and to aid in its pressing down against the seat in tight sealing engagement therewith. In one form of the invention the lever member comprises a leaf spring having a central upwardly extending portion which bears against a shoulder of a valve lift rod which forms the valve drive member. In the closed position the valve lift rod is biased by a compression spring against the central portion of the lever to cause compression of the lever which advantageously is a leaf spring and the outward extension of its arms into the receiving groove and the tight sealing engagement of the disc on the valve seat. The central cam is arranged below the central portion of the lever which causes a spreading of the arms during the closing movement. In another embodiment the arms are biased by cup springs outwardly away from the disc toward engagement with a drive cam plate. Pressure applied by the cam plate causes an outward movement of the outer ends of the lever to engage into the receiving grooves.
REFERENCES:
patent: 833303 (1906-10-01), Clark
Balzers Patent und Betelligungs AG
Klinksiek Henry T.
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