Fluid flow control
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United States of America Patent
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-
Aug 29, 1995
Issued Date -
N/A
app pub date -
Nov 9, 1993
filing date -
Dec 21, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A metering apparatus, which may be single- or double-acting, includes a valve device including a closure member, an inlet port, an outlet port and one or two other ports communicating with a metering chamber of the single-acting apparatus or respective metering chambers of the double-acting apparatus. The closure member prevents communication between the inlet port and the outlet port during normal working, but, to allow flushing of the apparatus by cleaning fluid, the closure member can be displaced to an abnormal position in which the inlet port communicates with the outlet port by way of the other port(s).
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