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Safety Interlocks – Trapped Key Interlocks – Door Switches – Safety Relays – Foot Petals – E-Stop Boxes – Light Curtains – Safety Mats – Valve Lockouts – IP69K – Ethernet Interlocks – Explosion Proof Switches – Control Panels

The market leader, Fortress Interlocks designs and manufactures safety access & control systems. Fortress offers an unrivaled portfolio suitable for applications across a wide industrial base from power generation and distribution, steel, automotive, recycling, building materials, through safeguarding robots and palletisers. With in excess of 40 years experience in the safety market, Fortress is renowned for innovative design, robust engineering and reliability.


  • Established in the safety industry since its very creation in 1922
  • Offer unrivalled experience in trapped key interlocking                                                                                                                                                                

Smith Flow Control Ltd is a British company who specialize in the field of Mechanical Valve Control Equipment. This includes: Procedural control using Mechanical Valve Interlocks and Activity Management Systems, EasiDrive portable valve actuators, FlexiDrive mechanical valve linkage systems for remote and/or simultaneous operation.