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US 9,791,051 B2Granted
DLC-coated gate valve in petroleum production or water injection
AssigneeAker Subsea AS
InventorsHenrik Dishington Haldorsen, Dag Twist
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AssigneeAker Subsea AS
InventorsHenrik Dishington Haldorsen, Dag Twist
Estimating the term…
The invention provides a gate valve (1) for control of petroleum production or water injection, distinctive in that at least one surface subject to sliding in operation of the valve comprises a top layer coating of diamond like carbon (DLC). The DLC contains hydrogen, preferably more than 16 atom-% and more preferred more than 17 atom-%. It is further directed to a method of commissioning or operating a gate valve according to the invention, and use of a diamond like carbon (DLC) top layer coating on at least one surface subject to sliding in operation of the gate valve. Valve parts have a tendency of sticking, adhering or cold welding together, which result in high friction. The aim of the invention is to reduce or eliminate friction problems occurring with time or operation cycles, when using a full scale gate valve.
A gate valve for control of petroleum liquid, gas, and water in any mixture ratio, the gate valve comprising:
A method of eliminating sticking in a gate valve for control of petroleum liquid, gas, and water in any mixture ratio, the method comprising:
A gate valve for control of petroleum liquid, gas, and water in any mixture ratio, the gate valve comprising:
Dependencies are inferred from the claim text.