Thermactor delay control system

Details Thermactor delay control system Thermactor delay control system

F - Mech Eng,Light,Heat,Weapons

01

N

172/11

F01N 3/10 (2006.01) F01N 3/22 (2006.01)

Patent

CA 1180284

ABSTRACT A retard delay control valve 60 has a housing 62 defining a chamber 72 therein which has a check valve 68 in communication with the outlet 64 that is in communication with a ported vacuum source 12. The end of the chamber 72 has an inlet 66 in communication with the vacuum reservoir 54 which is in communication with the control section 56 of bypass valve 58. The chamber 72 has a scintered metal plug 76 in communication with and unchecked to the exterior of the chamber 72 for continuously bleeding in ambient air directly into the chamber at a sufficiently small rate such that when a vacuum is supplied to outlet 64, the chamber 72 is evacuated to maintain the bypass valve in a closed position. When the vacuum is not applied to outlet 64, the check valve 68 is closed to allow continuous bleeding through the scintered metal plugs 76 to slowly dissipate the vacuum in the chamber 72 such that after a predeteremined amount of time the bypass valve 58 is opened.

387724

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