Valve for subsea hydrate inhibitor injection

摘要

Valve for throttling the flow rate of a fluid, distinguished in that it comprises a bolt (12), a pipe section (8) having inner dimension adapted to enclose the bolt sealingly, a groove (13) in at least one of the outer surface of the bolt and the inner surface of the pipe section, the groove providing a fluid passageway between the enclosed bolt and pipe section, an inlet port having fluid connection to an upstream end of the groove, an outlet port having fluid connection to a downstream end of the groove, and means to adjust a coaxial position of the bolt (12) relative to the pipe (8), by moving one or both of the bolt and pipe section, in order to adjust the throttling effect of the valve. System comprising valves of the invention.

主权项

1. A valve for subsea hydrate inhibitor injection into a flow of a subsea wellhead, wherein the hydrate inhibitor comprises eroding particles, the valve comprising:
A bolt and a pipe section, the pipe section having an inner dimension adapted to enclose the bolt, A stab end including an inlet port and an outlet port, axially apart on the stab end, each of the inlet and outlet ports comprises a ring shaped groove formed by a pair of ring-shaped ribs perpendicular to a sidewall of the stab end, A confined helix shaped throttling flow bore provided by a groove in at least one of an outer surface of the bolt and an inner surface of the pipe section, and Means to adjust the throttling effect of the valve, Wherein a confined part of the groove has a length that is variable by moving an axial position of the bolt relative to the pipe section, and adapted so that all of the hydrate inhibitor flows, follows, and flushes a full length of the confined helix shaped throttling bore, and Wherein the groove comprises a groove flow bore cross section area greater than about 70 mm2; Wherein the stab end is configured to fit into a receptacle on the subsea wellhead.