Valves and valve actuation – With material guide or restrictor – Movable or resilient guide or restrictor
Patent
1985-07-26
1987-01-06
Rosenthal, Arnold
Valves and valve actuation
With material guide or restrictor
Movable or resilient guide or restrictor
13762537, 251127, F16K 4704
Patent
active
046340955
ABSTRACT:
In a choke valve having flow restricting stages for controlling fluid under relatively high pressure, a rising stem axially moves a valve toward and away from a valve seat opening and closing a fluid passageway through the valve. A plurality of superposed flow restriction members, each closely surrounding the valve stem and having a recess loosely surrounding the valve stem, are disposed on the upstream side of the valve seat. Slots, formed in the valve stem wall, mate and mismate with the flow restriction recesses in response to axial movement of the valve stem and control fluid under relatively high differential pressure across the valve.
REFERENCES:
patent: 3971411 (1976-07-01), Baumann
patent: 4078582 (1978-03-01), Hetz
Rhea Robert K.
Rosenthal Arnold
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