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Interlock for needle valve

Needle valves are sometimes referred to as plunger valves, are regulating valves and enable engineers to finely control and regulate water flow and pressure.

In order to ensure safe operation of needle 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.

Application for needle valve interlocks

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

Needle operated valves are commonly used in applications like:

Download specs for Needle valve Interlocks

Solutions for interlocking needle valves

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

Quarter turn interlocks specs:
  • Single & double key – 3 sizes: small medium & large - specs
  • AISI 316
  • Material certificate 2.1 (3.1 on request)
  • 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.