Quarter Turn

Hydraulic Subsea Actuators

Double acting and spring-return quarter turn and linear actuators with torque outputs to 1,200,000 Nm and an ROV subsea gear for submerged crude oil or sea water environments.

Features & Benefits:

  • Cylinder and housing materials fully suitable for use with water-based fluids, synthetic and hydraulic oils
  • Easy installation and disassembly without the need for any special frame/device
  • Unique and patented clutching device with an intermediate spool-piece allows quick coupling to the valve, regardless of the shaft position
  • Pressure-compensating device allows the operation of the valve at virtually any depth
  • Plain and moulded construction with compatible materials to avoid galvanic corrosion or stress cracking
  • Manifolded hydraulic connections eliminate external pipework or fittings
  • On-off and modulating linear options
  • Optional ROV interface to API 17D, ISO 13628-8 Class I, II, III, IV
  • Control systems to customers’ specifications
  • Hydraulic manual emergency drive


The unique design of Biffi subsea actuators enables them to be coupled to any kind of valve shafts and flanges easily and quickly. Suitable for installation at depths to 3000m, they are retrievable readily and effortlessly from underwater.


Supply pressure: 345 bar g (5000 psi) maximum
Supply fluid: Hydraulic oil
Max. working depth: 3,000 m
Output torques :
Double acting: up to 1,200,000 Nm
Spring return: up to 140,000 Nm
Linear: up to 300,000 Nm
ROV subsea gear: up to 600,000 Nm

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