Patent ID: 9359837
Filing Date: 2016-06-07
CPC Classification: E02B,E21B

Claim Text:
1. A hydraulic cylinder unit for connection to a wire line riser tensioner system, the hydraulic cylinder unit comprising: a hydraulic cylinder comprising a first cylinder chamber, a second cylinder chamber and at least one cylinder piston arranged to separate the first cylinder chamber from the second cylinder chamber, the at least one cylinder piston comprising a piston rod and a piston head; a low pressure tank arranged as a closed cylinder so as to comprise a desired pressure; at least one first conduit inserted into the closed cylinder of the low pressure tank and configured to provide a fluid communication between the low pressure tank and the first cylinder chamber; a high pressure fluid reservoir; at least one second conduit configured to provide a fluid communication between the high pressure fluid reservoir and the second cylinder chamber; at least one feedback conduit configured to provide a direct fluid communication between the first cylinder chamber and the second cylinder chamber; a valve element comprising at least one valve, the valve element being configured to be in a fluid communication with the at least one first conduit and the at least one feedback conduit, the valve element being configured to provide a reversible switching between either, at least one first sheave arranged at a first axial side of the first cylinder chamber; and at least one second sheave arranged at a second axial side of the first cylinder chamber, wherein, the wire line riser tensioner system comprises a riser tensioning cable and a riser, the riser tensioning cable being connectable to an end of the riser, and the at least one first sheave and the at least one second sheave are each configured to receive the riser tensioning cable during a use of the wire line riser tensioner system.