Enforce safe operating procedures

By securing and regulating your valve operating procedures you protect people and optimize your process flow.

Ensure you adhere to valve changeover procedures

Mechanical valve interlocks ensure you adhere to a safe sequence of operation. They are permanently mounted on top of valves and other process equipment.

  • Transfer of uniquely-coded keys eliminates the chance of human error
  • Improve valve operating efficiency and protect operating personnel

At Sofis you can choose from the two most renowned mechanical valve interlock brands. Smith Flow Control and Netherlocks have been the leading brands for more than 30 years.

Go to valve interlocks
Valve interlocks
Control system for safe valve operations

Receive guidance through complex valve operations

Our sequence control products guide you when valve operations involve a complex sequence of events.

  • Help you follow complex procedure
  • Ensure you adhere to safety guidelines
  • Integrate field device input signals into manual valve operations
Go to sequence control

Organise and control your manual valve movements

You receive real-time status information about manual valve operations. This information is vital for your operational management, asset integrity programme and risk assessments.

  • Monitor and organize the operation of manual valves
  • Authorize and log your manual valve operations
Go to key management
key management system for valve interlocks
Smith Flow Control and Netherlocks have merged. We are now Sofis.
Manual valve lockout device

Secure your installations during incidental maintenance

By temporarily locking out manual valves you protect people and equipment during maintenance activities.

  • You can lock out any type of manual valve
  • Prevent unauthorized opening of valves while you are maintaining a system
Go to valve lockout

How can we help you?

With 30+ years of experience we can help you creating smart valve operations. Let us share the lessons we’ve learned with you by participating in HAZOP studies, interlock sequence design and customized process safety products.

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