Valve for respirator
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United States of America Patent
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-
Sep 25, 1990
Issued Date -
N/A
app pub date -
May 9, 1989
filing date -
Nov 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve for a respirator has an elastomeric valve member (18) of generally dished form with an annular channel (25) around its central portion (24). The member (18) is secured at its center by a shouldered conical stem (19) and seals round its periphery (23). The channel (25) allows a sudden collapse of resistance to opening force in the direction of the arrow A above a predetermined amount, but a positive biassing action towards closure. The edges of the channel (26,27) are slightly axially displaced from one another. Both inlet and outlet valves of a respirator may be equipped with such a valve member.
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