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Interlocks for globe valves

Globe valves are being used for regulating the flow inside a pipeline. This could be manual or automated. In order to ensure safe operation of globe valves, Alcatraz Interlocks provides multi turn locks, with both single and double keys in two sizes: small & large. 

Alcatraz integral multi turn (type DML/SML) valve interlocks fit on all types of handwheel operated valves, such as gate, globe and all gear operated valves. The interlocks are easy to install, even when the valve is in a live process. They are mounted on multi turn valves to interlock the locked open and/or locked closed position of the valve. Only if both keys are inserted into the lock portions the valve can be operated. The first key can only be released in the fully open position, the other key can only be released in the fully closed position.

Alcatraz’ Interlocks for globe valves can be used to control valve flow, ensure safe valve operation, pressure safety valve systems and pig trap systems.


Applications of globe valve interlocks

Alcatraz’ Interlocks for globe valves can be used in multiple situations like control valve flow, ensuring safe valve operation, safe switchover of pressure safety valve systems and operation of pig trap systems. To offer the right interlock for a globe valve we need to understand your application and sequence of actions. To execute this properly our dedicated team could assist you with measurement, commissioning and installation. Globe valves are commonly used in applications like:

Download specs for Globe valve Interlocks

Solutions for (inter)locking globe valves

Globe valves utilize a handwheel to operate. To lock these valves we have designed two kinds of interlocks depending on your sequence (linear or nonlinear), our engineering department will design it.

DML (small & large) interlocks specs:
  • AISI 316
  • Material certificate 2.1 (3.1 on request)
  • ML 1 interlock can be mounted onto all host valves with a drive bush edge to edge dimension less than 65 mm
  • Electropolishing
  • No modification to host equipment

Feature and benefits:
  • Integral parallel splined drive-tube
  • Encapsulated lock portion preventing ingress & contamination
  • Mechanically programmed keys
  • Alcatraz 5 step safety integrity design

Our specialists

Meet specialist Dennis

Do you want to operate safely and prevent failures in your applications? Contact Dennis or one of our technical engineers to discuss how to do it.



Do you want to receive more information about our custom-made valve interlocks and trapped key solutions on your application? Please fill in the contact form and we will respond as soon as possible.


Electrical Key Cabinets

An Electrical Key Cabinet consists of integrated electromechanical components preventing key removal.

Spare Keys

The spare keys are intended to briefly replace a lost key until a replacement has been purchased.

Sequence control units

This is a mechanical device that is designed to fulfil client's complex non-linear Interlocking Sequence requirements.