Fluid handling – Systems – Sequentially closing and opening alternately seating flow...
Patent
1976-06-08
1977-12-27
Nilson, Robert G.
Fluid handling
Systems
Sequentially closing and opening alternately seating flow...
91390, 267113, 267DIG1, F16K 1114
Patent
active
040649105
ABSTRACT:
A control valve for controlling the supply of pressurized fluid to a working element, such as a pneumatic spring, comprises a housing having a bore comprising first and second bore sections with a smaller diameter middle bore section. A connection for a source of pressurized fluid communicates with the first bore section; an outlet opening with the second bore section; and a working element, such as a pneumatic spring, is fed from the middle bore section. A valve stem is slidable within the middle bore section in response to displacement of the working element, and has a duct therethrough which can interconnect the first and the second bore sections but which can be closed off by a closure member in the first bore section. The closure member can also isolate the middle bore section from the first bore section. The shape of the valve stem is such that for small deviations of the working element from a datum position, fluid flow from the first bore section into the middle bore section is throttled so that a slow return of the working element towards the datum is obtained, whereas the flow is unthrottled for larger deviations and a faster return is obtained.
REFERENCES:
patent: 1279087 (1918-09-01), Desmond
patent: 3006657 (1961-10-01), Augustin
patent: 3094341 (1963-06-01), Alfieri
patent: 3837361 (1974-09-01), Urban
Effbe-Werk Fritz Brumme & Co. KG
Nilson Robert G.
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