Flow Rate Controller For a Closed Fluid Circulating System
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United States of America Patent
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Issued Date -
Apr 24, 2008
app pub date -
Sep 1, 2005
filing date -
Sep 1, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A flow rate controller (40) for a closed fluid circulating system, the controller including an orifice (41) between the upstream high pressure fluid (42) and the downstream low pressure fluid in the system, a valve member (44) biased to partially close the orifice (41) and cooperating with a piston member (47) having one end exposed to low pressure fluid (51)downstream of the orifice (41) and an opposed end (52) exposed to upstream high pressure fluid via a bypass passage (53), whereby as upstream high fluid pressure (42) increases, the piston member (47) acts to move the valve member (44) further into the orifice (41) to reduce the fluid flow through the system. The flow rate controller (40) is used to control a descent device to enable people or loads to descend from elevated locations in emergency situations.
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