Adjustable pressure double latching valve
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United States of America Patent
Stats
-
Dec 30, 2008
Grant Date -
N/A
app pub date -
Feb 2, 2007
filing date -
Feb 2, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Methods and devices for maintaining a minimum pressure of calibration gas, such as in an emission testing system or a similar arrangement, using a double latching valve (DLV). The DLV comprises a body having specific internal passages; a two-way normally closed (blocked) shut-off valve; an enlarged low pressure, sensitive air pilot acting upon the two-way valve; an adjustable sequencing latch valve integrated into the supply latch circuit; and a defined orifice incorporated into the supply latch circuit.
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