Patent ID: 8701779

Claim:
A valve device for use in an offshore or onshore oil well, comprising: a housing with an inlet and an outlet, where the inlet and the outlet are connected via an internal longitudinal passage; a valve seat and a valve body which controls the flow of a first fluid through the internal longitudinal passage; and a pressure-sensitive device; characterised in that the valve device comprises a support which is fixedly mounted inside the housing and in that the pressure-sensitive device comprises; a first bellows element which is mounted on a first side of the support and is arranged to be exposed to a second fluid; and a second bellows element which is mounted on a second side of the support and is arranged to be exposed to the first fluid, wherein the first bellows element and the second bellows element are filled with an incompressible fluid and are interconnected via the support, and wherein the second bellows element is connected to the valve body allowing the position of the valve body relative the valve seat to be controlled by a pressure differential between the first fluid and the second fluid.