Subsea valve manufacturer Koso Kent Introl (KKI) has announced the successful completion of a comprehensive development and qualification programme for a brand-new range of subsea control valves.
This milestone marks a significant leap forward for subsea processing, carbon capture, utilisation and storage (CCUS), as well as hydrogen storage applications. These are sectors where precise, reliable control has historically been difficult to achieve.
Until recently, subsea systems often relied on relatively crude choke mechanisms to regulate process flows. While functional, these solutions lacked the accuracy and control necessary for optimised subsea processing, resulting in system-wide compromises and reduced operational efficiency.
In critical applications – such as subsea separation, boosting, CCUS injection, and hydrogen storage – this lack of precision could limit the overall effectiveness of the subsea infrastructure.
The answer to that challenge is the Series 1275 Dynamic Subsea Control Valve Range.
KKI leveraged decades of experience in manufacturing specialised topside process control valves, to ‘marinise’ proven design features into a robust subsea solution. This approach meant that each element – from the mechanical operator to the sealing system – was engineered to withstand the extreme demands of subsea environments.
The qualification testing process involved input from some of the world’s leading oil and gas operators, ensuring the final product met or exceeded real-world expectations. In fact, the Series 1275 underwent one of the most extensive endurance testing programmes ever conducted on a subsea control valve.
The development team adopted a conservative, safety-first philosophy, recognising that reliability is paramount in subsea systems where maintenance can be costly and complex.
General testing included hydrostatic pressure trials, seat leakage checks, and API 6A PSL 3G gas testing. More specialised qualification tests included:
• API 6A PR2F
• Hyperbaric testing in accordance with API 17D / ISO 13628
• Flow performance testing.
• Endurance testing as defined jointly by client and KKI
To support the programme without disrupting ongoing production, KKI invested heavily in upgrading its in-house test facilities. This capability not only accelerated the project but also positions KKI for future subsea developments.
The Series 1275 range incorporates several industry-leading innovations:
- Low-friction mechanical operator featuring an Inverted Planetary Roller Screw (IPRS) for enhanced accuracy and positioning.
o Operating torque reduced to less than 25% of typical subsea choke operators.
• Advanced stem hard coating for superior wear and corrosion resistance.
• New gland seal packing system designed to accommodate the extensive stem movement typical
in subsea operations, ensuring long-term sealing integrity.
These features combine to deliver exceptional control accuracy, reliability, and operational lifespan: all essential for high-value subsea infrastructure.
By launching the Series 1275 Dynamic Subsea Control Valve range, Koso Kent Introl has reinforced its position at the forefront of subsea flow control technology. With the energy industry accelerating towards subsea processing, CCUS deployment, and hydrogen storage infrastructure, the need for precision-engineered, reliable subsea control valves will
only grow.
This new range not only fills a historic technology gap but also offers operators a proven, qualified solution that enhances efficiency, reduces operating torque, and withstands the harshest subsea conditions.