Fluid handling – Systems – Multi-way valve unit
Patent
1974-08-26
1977-02-22
Cohan, Alan
Fluid handling
Systems
Multi-way valve unit
13762569, 251127, F16K 4708, F15B 1304
Patent
active
040087379
ABSTRACT:
Multiple path means for a fluid flow control device is shown in connection with a typical spool type servo valve and a relief 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 a stack of disks. To provide a configuration which is very economical of space, the disks are arranged such that the flow path turns back and forth through different planes. Groups of flow paths are defined by a number of groups of perforated disks confined between the imperforate disks. Two perforated disks having patterns of openings are positioned on opposite sides of a similar disk having a pattern of small orifices. By proper juxtaposition of the three or more disks, a circuitous flow pattern is established from a first chamber defined by a first slot and its side walls, axially through a series of small orifices to a second such chamber, substantially radially through said second chamber and axially in the opposite direction through more orifices to another such chamber and continuing in this manner across the stack of disks. The dimensions of the slots and orifices are chosen such that the velocity of flow through any orifice is maintained within a desired limit. To provide a substantially smoother flow vs. valve displacement relationship, the working faces of the valve lands are canted such that in a given position, edges of more than one of the disks of the stack are uncovered; or, alternatively, the stack of disks is canted such that the lands of the spool expose edges of more than one disk. In this manner, irregularities in the flow pattern caused when the lands of the spool pass a disk having no flow entrances are minimized. Also, the magnitude of flow irregularities are reduced by the number of flow paths opened during the spool displacement equivalent to one disk thickness; i.e., the more openings (one at a time), the smoother the flow pattern.
REFERENCES:
patent: 1292013 (1919-01-01), Munger
patent: 2380705 (1945-07-01), Proctor
patent: 2958340 (1960-11-01), Rosebrook
patent: 3899001 (1975-08-01), Orme
Kluczynski Matthew L.
Orme Myrl E.
Cohan Alan
Michalsky Gerald A.
Smith Robert C.
The Bendix Corporation
Thornton William F.
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