Spring element for use in sliding gate valve

Details Spring element for use in sliding gate valve Spring element for use in sliding gate valve

1977-02-28

1980-02-19

Spar, Robert J.

Dispensing

Molten metal dispensing

Flow controllers or assists

222512, B22D 4102

Patent

active

041890736

ABSTRACT:
Spring elements are described that are especially adapted for use in high temperature environments such as for example in sliding gate valves for metal pouring vessels. The spring elements include an expansable chamber defined in part by a bellows member and a thrust surface adapted to apply the spring force. The chamber is filled with a thermally expansive fluid operative to expand the chamber and thus apply the spring force when exposed to elevated temperatures and conversally, to effect retraction of the same when the elevated temperatures are removed.

REFERENCES:
patent: 598982 (1898-02-01), Egger
patent: 3664653 (1972-05-01), Walker
patent: 3926406 (1975-12-01), Hind

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