(57) A valve for use with a downhole pump, wherein the valve comprises a single moving
part that in a first position forms only a first interface and in a second position
forms only a second interface, each interface presenting a barrier that cannot be
breached by fluid, whereby the first interface directs fluid to the production tubing
only from the annulus and the second interface directs fluid to the production tubing
only from the pump, the pump and annulus and production tubing are simultaneously
interconnected by a chamber of the valve when the single moving part is between the
first and second positions, each interface is maintained or broken depending on the
fluid pressure differential across the associated interface, the single moving part
moves between the first position and second position according to the fluid direction
through the valve, characterised by each of the two interfaces being formed between
a convex surface of the single moving part and a concave surface of a non moving part
of the valve, whereby the single moving part self aligns with each interface and only
via the interface, and where the single moving part does not house or incorporate
one or more rotational or/and linear axes.
|
|
