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Interlocks for gate valves

In order to ensure safe operation of gate valves, Alcatraz Interlocks provides multi turn locks, with both single and double keys in two sizes to fit correctly on all common gate valve sizes.

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. The key movement is only possible in fully open / closed position thus providing an extra confirmation that the valve is in the exact desired position as compared to car seals etc.

Applications of gate valve interlocks

Alcatraz’ Interlocks for gate 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 gate 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. Gate valves are commonly used in applications like:

Download specs for Gate valve Interlocks

Solutions for (inter)locking gate valves

Gate 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.

Single and double key multiturn lock 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 of both locks:
  • Mechanically programmed keys
  • Integral parallel splined drive-tube
  • Encapsulated lock portion preventing ingress & contamination
  • 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.