Valve operation systems

Sofis was formed in 2016 by the merger of Smith Flow Control and Netherlocks Safety Systems.

Sofis offers valve operation systems to the process industries, mainly in the oil and gas, and chemical processing, sectors.

Valve position indicator

Valve key portable actuator

Valve operation

Products and services

  • Mechanical valve interlocks
  • Key management
  • Sequence control
  • Valve position indicators
  • Portable and remote valve operators
  • Partial stroke testing equipment for critical valves
  • Lockout / tagout
  • Site services – installation and commissioning, maintenance, training


  • Oil and gas
  • Petrochemical and chemical
  • Pipelines
  • Nuclear
  • Tank parks
  • Water and wastewater
  • Heavy industry and plant processing
  • Marine and shipping

Sofis has offices in the UK, the Netherlands, Germany, the UAE, India, China, Singapore, Australia and the USA.

Sofis operates within the Halma Process Safety Sector.

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United Kingdom
6 Waterside Business Park, Eastways Industrial Estate, Witham, Essex, CM8 3YQ, UK.
Tel: +44 (0)1376 517901

J. Keplerweg 14, 2408 AC Alphen aan den Rijn, The Netherlands.
Tel: +31 (0) 172 471 339