CPC F16K 3/243 (2013.01) [E21B 34/08 (2013.01); F16K 3/26 (2013.01); F16K 25/04 (2013.01)] | 19 Claims |
1. A flow control valve comprising:
a housing comprising at least one orifice and an interior flow passage;
a choke sleeve disposed within the housing, the choke sleeve comprising a first choking orifice and a second choking orifice, wherein the first and second choking orifices are aligned with the at least one orifice of the housing;
a piston disposed within the choke sleeve, the piston being slidable relative to the choke sleeve between a first position, a second position, and a third position wherein:
in the first position of the piston, the piston prohibits fluid communication between the at least one orifice of the housing and the interior flow passage via the first choking orifice and further prohibits fluid communication between the at least one orifice of the housing and the interior flow passage via the second choking orifice;
in the second position of the piston, the piston prohibits fluid communication between the at least one orifice of the housing and the interior flow passage via the first choking orifice while the interior flow passage and the at least one orifice of the housing are in fluid communication via the second choking orifice; and
in the third position of the piston, the interior flow passage and the at least one orifice of the housing are in fluid communication via the first choking orifice and the interior flow passage and the at least one orifice of the housing are in fluid communication via the second choking orifice; and
one or more flow restriction rings configured to inhibit fluid flow through a leakage gap formed annularly between the choke sleeve and the piston.
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