valve interlocks icon

VALVE INTERLOCKS

What are
valve interlocks?

A valve interlock, is placed between the valve and the actuator and locks the valve in the fully open or closed position.

Valve interlocks work through a trapped key system. This mechanical key interlocking system ensures that coded keys are released and locked in a predetermined sequence. The valve interlock thus guarantees that the valves are only opened or closed when the required conditions are met.

Fireproof API607
and INOX 316
Fully
mechanical
Resistant to
sand, soil and
humidity

Valve Interlocks

Mechanical interlocks for locking different types of valves

Do you need support?
Contact our specialists

On-site measuring and assembly service

We offer on-site measuring and assembly services by our experts for the installation of valve interlocks. This ensures that a suitable solution is always provided.

Mechanical Interlocks
for handwheel valves

Alcatraz integral multi-turn (type DML/SML) valve interlocks fit all types of handwheel operated valves, such as slide valves and globe valves, and are easily placed between the handwheel and the valve with an adapter piece.

Multi-turn mechanical interlock systems for handwheel valves. Locks and unlocks keys only in a fully open or closed position. The handwheel can therefore only be operated when both keys are inserted, after which key A can only be removed in the open position and key B can only be removed in the closed position.

  • Full mechanical interlock
  • Manufactured from stainless steel AISI 316
  • Compact design
  • Highly coded key system prevents manipulation
  • Fireproof according to API 607 sixth edition test
  • Resistant to sand, dirt, humidity and chemicals
  • Tested for low temperature operation
  • Ergonomic positioning of lock mechanism
Downloads
Alcatraz afsluiter vergrendeling
Robust Design

Alcatraz DML or SML interlocks have a compact design with a minimum of moving parts for years of trouble-free operation.

Fully corrosion-resistant

Alcatraz valve interlocks are completely made of stainless steel 316, the stainless steel locking mechanisms are also equipped with spring-loaded protective caps to limit contamination of the mechanism.

Key detection

Alcatraz offers the possibility to equip the interlocks with (ATEX) limit and/or proximity switches for the detection of the key and position of the valve.

afsluiter vergrendeling

Mechanische interlocks
voor hendelbediende afsluiters

Alcatraz DQL and SQL interlocks are specially designed for quarter turn lever operated ball valves and butterfly valves. This interlock system is also integrated between the actuator and valve for easy operation.

By using an adapter set, DQL and SQL valve locks can be easily installed on existing lever-operated valves, even when the valve is under pressure.
Only when both keys are inserted into the lock can the valve be operated. The first key can only be removed in the fully open position, the other key can only be removed in the fully closed position.

  • Full mechanical interlock
  • Manufactured from stainless steel AISI 316
  • Compact design
  • Highly coded key system prevents manipulation
  • Fireproof according to API 607 sixth edition test
  • Resistant to sand, dirt, humidity and chemicals
  • Tested for low temperature operation
  • Ergonomic positioning of lock mechanism
Downloads
Alcatraz valve interlock key
Coded keys

For defined coded keys. Protects against manipulation.

quarter turn valve interlocks
Non intrusive design

The interlock has a non-intrusive design, it uses the existing mounting brackets.

QLL on ball valve
Easy installation

The Alcatraz adapter set allows easy mounting on existing mounting holes.

We are
here to help

Contact one of our technical specialists or sales engineers

Sales engineer Marco Heijkoop small

Marco Heijkoop

Sales Engineer

marco.heijkoop@usp-safety.com
Sales engineer Rick de Jonge small

Rick de Jonge

Sales Engineer

rick.dejonge@usp-safety.com
Rob Voordendag small

Rob Voordendag

rob.voordendag@usp-safety.com
Robert van de Ven small

Robert van de Ven

robert.vandeven@usp-safety.com

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a meeting

For all your questions about our products and services, please fill in the form below (response within 1 working day).

For all your questions about our products and services, please fill in the form below (response within 1 working day).