专利名称：FILTER BYPASS INDICATOR发明人：JAMES R. MCBURNETT申请号：US3644915D申请日：19690827公开号：US3644915A公开日：19720222
摘要：1297825 Valves ALLIS-CHALMERS MFG CO 21 Aug 1970 [27 Aug 1969] 40367/70Heading F2V [Also in Divisions B1 and H1] An hydraulic fluid filter circuit comprises a filter3 including an inward-flow, cylindrical filter element 10 and a spring-loaded by-pass valve21 whose seat 22 and movable member 23 constitute a pair of contacts in an electriccircuit whereby warning is given when the valve is opened. Spring 24 is mounted on aninsulating sleeve 25 and connected to the positive side of battery 29 through insulatedterminal 26. In Fig. 1 lamp 31 goes out when the valve opens. Fig. 3 (not shown) illustratesuse of a relay to cause the warning lamp to come on when the valve opens. In Fig. 2 (notshown) the audible alarm (39) is connected in parallel with the valve so as to be short-circuited until the valve opens, whereupon current passes through and actuates thealarm. Switches 37 and (40) enable the alarm to be tested with the valve closed. Housing9 is secured to head 7 by wing bolt 13 screwed into hollow outlet spigot 14.
申请人：ALLIS-CHALMERS MFG. CO.
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