US 10,208,563 B2Granted

Fluid flow control valve

AssigneeSubsea Chokes International AS

InventorEirik Volent

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Abstract

Fluid flow control valve, the valve comprising a valve housing (10) provided with a flow channel (12), which in direction from the inlet section to the outlet section, comprises a substantially conical inlet (13), a valve seat (14), and a diffuser (15) at the outlet section, which transfers into a flow channel (16). A needle-shaped spindle (11) is arranged axially movable within the flow channel (12) and exhibits a largest diameter DN. The inlet (13) exhibits a first conical inlet section (13′) having an angle α1 of 15° with the longitudinal axis of the flow channel (12), and a second inlet section (13″) with a radius of curvature R2 equal to 5.7 times the diameter DN of the spindle (11). The diffuser (15) is conical having an increasing cross-section in the flow direction by an angle α2 of 30° with the longitudinal axis in the flow channel (12). The design of the valve produces minimum erosion at the inlet section, and minimum cavitation and erosion in the diffuser section (15).

Claims10

Dependent claims

Fluid flow control valve, said valve comprising a valve housing (10) provided with a flow channel (12) along a longitudinal axis, which in direction from an inlet section to an outlet section, comprises a conical inlet (13) at the inlet section, a valve seat (14), and a diffuser (15) at the outlet section, which transfers into an outlet flow channel (16) having a uniform flow cross-section, wherein a needle-shaped spindle (11) is arranged axially movable within the flow channel (12) and exhibits a diameter, at the end to be contacted by the valve seat, equal to or larger than the smallest flow cross-section of the valve seat (14), characterized in that:

a) the inlet (13) exhibits an inlet diameter (DIN) and comprises a first inlet section (13′) which is conical and exhibits an angle (α1) with the longitudinal axis of the flow channel (12) of 10-30°, and
a second inlet section (13″) which is curved and exhibits a radius of curvature (R2) in the range of 4.7-6.7 times the diameter (DN) of the spindle (11),
b) the valve seat (14) exhibits a diameter DORI that is 0.8-1.1 times the diameter (DN) of the spindle (11),
c) the diffuser (15) is conical having an increasing cross-section in the flow direction, and exhibits an angle (α2) of 15-45° with the longitudinal axis of the flow channel (12), wherein the outlet flow channel (16) exhibits a diameter (DOUT) of about 2.4-4.4 times the diameter (DN) of the spindle (11), and
d) the radius of curvature (R1) of the spindle (11) towards the apex, is within the range of 4.7-6.7 times the diameter (DN) of the spindle (11).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/110,344Filed 20 Jan 2015
Priority: NO 201401193 Feb 2014
Published: US 2016/0333663 A117 Nov 2016
Granted: 19 Feb 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

E21B 34/06
Valve arrangements for boreholes or wells: in wells
E21B 21/10
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor: valve arrangements in drilling-fluid circulation systems
E21B 34/00
Valve arrangements for boreholes or wells
E21B 34/025
In well heads: chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid flow