Motor operated valves MOV

Interlocking system that mechanically blocks the power supply, the indicator plate and the manual override of the actuator.

Motor operated valve (MOV) 
interlocking system

Interlocking system description

As actuated valves are often part of valve interlocked operating procedures, Alcatraz Interlocks has designs for different systems. The IMS (Interlocks MOV System) is a mechanical interlocking system for Electrical actuators. It mechanically blocks various parts of the actuator: the power supply, the valve position indicator plate on top of the gear-unit and the manual override of the actuator. 

By the exchange of mechanical coded keys between the different components of the actuator, operation of the actuator can be incorporated into mechanical interlocked systems.

Download general arrangement drawing motor operated valve interlocking system

Composition interlocking system

The interlock on top of the indicator of the gear-unit has three different keys which exchange based on the position of the valve, two different keys for the open and closed position of the valve and one switch key for operating the MOV. 

On the Manual Override an interlock is fitted configured to accept the only switch key. The actuator switch is fitted with an interlock which is also configured to accept the switch.

Interlock operation

The initial valve position key is inserted into the indicator interlock allowing to release the switch key, this blocks the initiating position key in place and unlocks the indicator interlock. The switch is inserted into either the Actuator Selector Switch or the Manual Override, during operation the switch is trapped.

When the valve is operated to the alternate position the switch key is removed and MOV valve operation is disabled. The switch key is returned to the Gear-unit indicator interlock and inserted into the alternate valve position part of the indicator interlock. The key for the MOV valve alternate position can now be removed, locking the MOV in the alternate valve position and also preventing removal of the switch key. Which during operation of the valve is used to unlock either the actuator switch or the manual override.

All locking systems are built to our standard key coded mechanism.

MOV interlocking system features

  • Suitable for linear and rotating actuators.
  • Suitable for electric, pneumatic and hydraulic actuators.
  • Mechanically locks the power switch, position indicator and manual override.
  • Integrates MOV's into an interlocking sequence of manually operated valves.
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Motor operated valve interlocks MOV Alcatraz Interlocks MOV interlocking system Alcatraz Interlocks

Additional service

Besides the design and production of interlock systems, we provide a range of worldwide services: 

  • Before the final handover of the interlocking system we provide a full on site training for the client. We will not leave the site unless the operators fully understand the system and feel comfortable using it.
  • On- and offshore measurement and installation on site done by our qualified installation engineers and supervisors.
  • Assistance and advice with the design of the interlocking systems, sequences and special tailor made products.
  • Periodical check up or maintenance of your safety system to keep your system up to date. 
More information about MOV interlocks?

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