Drilling choke valve

Details Drilling choke valve Drilling choke valve

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) E21B 21/10 (2006.01) E21B 34/02 (2006.01) F16K 3/26 (2006.01) F16K 25/04 (2006.01) F16K 47/04 (2006.01)

Patent

CA 1201653

ABRIDGEMENT A multiposition choke valve assembly comprises: a) a valve body defining an interior chamber and inlet and outlet flow ports communicable with that chamber, b) a valve stopper sub-assembly movable axially longitudinally in the chamber, the sub-assembly including an axially extending stem, an axially extending sleeve, an annular section located between the stem and sleeve, and an annular seal on the annular section and exposed at the section periphery. c) the sleeve forming multiple through openings and having a retracted position in which the flow passes with relatively lesser velocity past the seal and then forwardly to pass via such openings with relatively in- creased velocity into the sleeve, followed by generally axially forward flow toward the outlet flow port, d) the sleeve having an advanced position in which the seal is radially compressed to engage a body bore, and the flow through the sleeve openings is blocked.

451210

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