Superior controllability

With our wealth of experience in the design and manufacture of the equipment required to meet the rigorous demands of wells, including the recent trend towards large-bore gas developments, we have the subsea chokes you need to ensure your reservoir performs reliably and safely.

Our latest hydraulic stepping choke has been qualified to API, ISO and NACE standards, and endurance tested to twice the level required, with more than two million steps performed. The design allows for fast actuation timing, and superior controllability and stepping resolution—providing greater control of flow rates in reservoir management.


Modular configuration options

To date, we have supplied more than 2,000 subsea choke valves, offering modular configuration options for production, injection, monoethylene glycol injection, and gas-lift applications, for insert retrievable or non-retrievable operations, and for shallow to deepwater use. Our chokes are available integrated with one of our subsea tree systems or as a single supply with a lead time of around seven months.

Comprising a high-integrity, forged one-piece choke body and using a single-stage, HF-LCV (high-friction, level control valve) design, our ‘plug and cage’ trim design has been used successfully on debris/sandy service applications, with multiple trim options that provide the specific range required for the application. This proven trim technology controls the flow and the trim design minimizes erosion, vibration, and noise in the system. For water-injection applications, we offer multi-stage trims to mitigate the onset of cavitation.

The valve actuator consists of a core gearbox with a proven high-integrity ‘ratchet and pawl’ design and pulsed/stepped hydraulic cylinders that provide the motive power. The actuator is of the ‘fail-as-is’ position type; we also provide options for either side or top over-ride as part of our modular configuration design.

Our chokes are nominal 2-inch, 5-inch or 7-inch sizes and are engineered to operate in water depths up to 10,000 ft (3,048 m), at operating pressures of 6,500 psi to 10,000 psi, and at operating temperatures ranging between –51°F and 300°F (–46°C to 149°C). We use proven materials with premium-grade tungsten carbides and corrosion-resistant alloys for longevity of field life.

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