Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing
Patent
1975-12-29
1977-09-13
Cohan, Alan
Fluid handling
With cleaner, lubrication added to fluid or liquid sealing...
Cleaning or steam sterilizing
1376253, 13762569, 251127, F16K 4708, F15B 1304
Patent
active
040475409
ABSTRACT:
Multiple path means for a fluid flow control device is shown in connection with a typical spool type servo valve. The multiple path means consists of a stack of washer-like elements or disks which cooperate to define a number of finely divided flow paths across the stack in which flow is forced through a series of alternating chambers and orifices with measured pressure drops across the orifices. Since many servo valves have comparatively short travel and since both control and wear problems tend to be most serious near null, it is desirable to minimize abrupt step flow gains around null.
In the present disclosure individual disks, at least at the ends of the stack, are made comparatively thin such that the thickness of two or more disks may be required to provide a normal opening width into the stack. Thus a first disk and a second disk may have openings at the inside edge which register at identical positions to admit flow into the stack with the second disk also having a second opening or set of openings at another position on its inside edge so that as the spool valve 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. In this way the flow vs. displacement characteristic of the valve may provide flow which is quite limited near null and yet increases quite smoothly since a new increment of flow into the stack may be added at every disk width rather than at the width of each opening or set of openings. Flow is preferably initially curtailed by being forced through a set of small series orifices only during a first increment of displacement after which larger openings are exposed in parallel to the orifices, thus permitting an accelerated flow. The flow vs. displacement characteristic may be tailored substantially as desired through arranging of the disks to provide lesser or greater flows into the stack at each disk position. Backflushing flow patterns are included such that, for an initial movement off null in either direction, only a limited flow is permitted, and for the next increment of flow a parallel passage is exposed which conducts fluid across the opposite side of the stack in a direction opposite to its normal flow, thus backflushing the orifices in that side.
REFERENCES:
patent: 3899001 (1975-08-01), Orme
Orme Myrl E.
Vick Ralph L.
Cohan Alan
Michalsky Gerald A.
Smith Robert C.
The Bendix Corporation
Thornton William F.
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