Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1995-12-07
1998-03-17
Rivell, John
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
2511292, 251207, 251230, F16K 3700, F16K 3106
Patent
active
057275912
ABSTRACT:
A rotary indexing valve has an electromagnetic coil which shuttles a spoil axially. As the spool shuttles axially, it cams on axially opposed surfaces so as to rotatably index the spool. Such rotatable indexing of the spool angularly positions different sized orifices into or out of registration with one of the ports in the housing to change the cross sectional area of the flow passage between the inlet and outlet ports of the housing. One of the cam surfaces is defined by an alternating series of peaks and valleys, and the valleys are at different heights so as to change the spacing between the spool and a pole piece, which varies the inductance of the coil dependent on the angular position of the spool. The inductance of the coil can therefore be measured to provide an electrical signal indicative of the angular position of the spool.
REFERENCES:
patent: 320105 (1885-06-01), White
patent: 1644171 (1927-10-01), Caldwell
patent: 1673451 (1928-06-01), Hartfield et al.
patent: 1765377 (1930-06-01), Marks
patent: 1856350 (1932-05-01), Metcalf
patent: 3173646 (1965-03-01), Wilcox
patent: 4744285 (1988-05-01), Presley
patent: 5573224 (1996-11-01), Kim
patent: 5599003 (1997-02-01), Seemann et al.
Applied Power Inc.
Rivell John
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