TMT Gate Valve Linear Override Tool

TMT Gate Valve Linear Override Tool

Subsea Completions
The Gate Valve Linear Override Tool (GVLOT) is a linear override tool that has the capability to override large gate valves. The tool uses a high capacity interface to transfer up to 139 metric tonnes (306,000 lbf) of force onto the gate valve actuator and have a stroke of 381mm (15”). This interface is different to those specified in ISO 13628-8 as they are not capable of transferring this force.
The tool can be installed and operated using a ROV and can be hydraulically locked open. The main hydraulic cylinder is manufactured from a titanium alloy to minimise the weight and enable it to be rated to a higher operating load. The tool can be provided with a hydraulic intensifier that is used to provide the operating pressure of 10,000psi (690bar) from the ROV hydraulics.
If required, the tool can be customised for shorter strokes and mechanical locking mechanisms.


  • Titanium alloy construction
  • 381mm (15") actuation stroke
  • 139mT (306,000lbf) maximum actuation force
  • Hydraulic lock to maintain gate valve override
  • Customised high capacity LOT interface
  • Deployable by ROV or tool deployment unit


Dimensions 865L x415W x500Hmm
Weight in Air 120kg
Weight in Seawater 95kg
Pressure Rating 10,000psi (690bar)
Depth Rating Limited by ROV Depth