Fluid handling – Systems – Multi-way valve unit
Patent
1977-12-01
1980-01-15
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762569, 251127, F15B 1304, F16K 4700
Patent
active
041833759
ABSTRACT:
Life extending means for a typical spool type servo valve consists of a stack of washer-like disks which cooperate to define a number of finely divided flow paths across the stack in which initial flow, as the spool valve is opened, is forced through alternating chambers and orifices with measured pressure drops across the orifices and wherein subsequent increments of valve travel expose large openings providing flow rates versus travel comparable to conventional spool type valves.
The individual disks may be made comparatively thin such that the thickness of two or more disks is required to provide a normal opening width into the stack. Thus a first disk and a second disk may have openings registering at identical positions to admit flow into the stack as a spool valve land passes the disks. The second disk also has a second opening or set of openings at another position on its inside edge so that as the land passes the second disk, it completes opening the first set of openings and begins exposing the second set of openings into the stack, etc. Thus the flow versus displacement characteristic of the valve may be made quite smooth since a new increment of flow into the stack may be added at every disk width. In another embodiment, flow is initially curtailed by being forced through a set of small series orifices only during a first increment of displacement corresponding to one disk width after which much larger openings are exposed in parallel to the orifices.
REFERENCES:
patent: 3722854 (1973-03-01), Parola
patent: 3899001 (1975-08-01), Orme
patent: 3917221 (1975-11-01), Kubota et al.
patent: 3941350 (1976-03-01), Kluczynski
patent: 4047540 (1977-09-01), Orme et al.
Michalsky Gerald A.
Smith Robert C.
The Bendix Corporation
Thornton William F.
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