F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
123/12, 123/13,
F02P 5/12 (2006.01) F02P 5/10 (2006.01)
Patent
CA 1318555
ABSTRACT A vacuum control valve logically selects between a pair of variable vacuum sources to provide a vacuum to a vacuum use station such that the supplied vacuum is the greater of the two vacuums (the lesser of the pressures). The valve has a main body with a longitudinal passageway extending between first and second inlets connectable to the vacuum sources. An outlet connectable to the vacuum use station is located centrally of the passageway and communicates therewith. A pair of valve elements are located in the passageway and operate to open and close fluid communication between the outlet and the two inlets so that the inlet having the greater vacuum is open for communication while the inlet with the lesser vacuum is closed. Preferably, the valve elements are mechanically connected to one another by a hollow spindle provided with outer ports adjacent each valve element and a central port which communicates with the outlet. Each valve elements seats and unseats against a respective valve seat formed in the passageway. The valve elements can thus toggle when the relative vacuums of the two sources are approximately equal with the spindle and valve elements provide inertial mass to smooth transitions between the two vacuum sources.
585849
Cornish Rodney H.
Weber James H.
Cornish Rodney H.
Smart & Biggar
Weber James H.
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