Valves and valve actuation – With material guide or restrictor – Movable or resilient guide or restrictor
Patent
1973-08-27
1978-03-07
Schwadron, Martin P.
Valves and valve actuation
With material guide or restrictor
Movable or resilient guide or restrictor
251269, 251334, 251DIG4, F16K 4704
Patent
active
040776069
ABSTRACT:
Multiple embodiments of fluid flow control valves are disclosed to include a plurality of unique features including; an operating spindle mounted within the valve casing to provide protection for both the spindle and valve stem, means for indicating the position of the valve stem, e.g. a dial guage mounted directly on the stem or a two-stage scale mounted on the stem and on the valve operating spindle, a stem structure which accommodates flow path sizing as well as positive no-flow sealing without the use of soft seals, adjustment structure which eliminates tolerance problems resulting from manufacturing, and replaceable flow control apparatus to permit use of a single basic valve to provide flow control in a wide range of circumstances. Certain of the above-listed features are useful in embodiments of the valve suitable for ordinary known uses and others are particularly useful in precision metering valves of the type which are used to meter accurately small amounts of fluid across a high pressure drop or small amounts of fluid from atmosphere into a hard vacuum.
REFERENCES:
patent: 1330429 (1920-02-01), Campbell
patent: 1587176 (1926-06-01), Olsen
patent: 1726302 (1929-08-01), Keema
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patent: 2531479 (1950-11-01), Southern et al.
patent: 2765143 (1956-10-01), Best
patent: 2778223 (1957-01-01), Kimbrell
patent: 3073566 (1963-01-01), Bredtschneider
patent: 3428291 (1969-02-01), Callahan et al.
patent: 3583427 (1971-06-01), Taulier
Chatham Precision, Inc.
Schwadron Martin P.
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