Vacuum control valve

专利名称：Vacuum control valve

发明人：James H. Weber,Rodney H. Cornish申请号：US07/132956申请日：19871214公开号：US04856478A公开日：19890815

摘要：A vacuum control valve logically selects between a pair of variable vacuumsources to provide a vacuum to a vacuum use station such that the supplied vacuum is thegreater of the two vacuums (the lesser of the pressures). The valve has a main body witha longitudinal passageway extending between first and second inlets connectable to thevacuum sources. An outlet connectable to the vacuum use station is located centrally ofthe passageway and communicates therewith. A pair of valve elements are located in thepassageway and operate to open and close fluid communication between the outlet andthe two inlets so that the inlet having the greater vacuum is open for communicationwhile the inlet with the lesser vacuum is closed. Preferably, the valve elements aremechanically connected to one another by a hollow spindle provided with outer portsadjacent each valve element and a central port which communicates with the outlet. Eachvalve 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 twosources are approximately equal with the spindle and valve elements provide inertialmass to smooth transitions between the two vacuum sources.

申请人：WEBER; JAMES H.,CORNISH; RODNEY H.

代理人：Timothy J. Martin,J. Preston Oxenham

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