Multi-Turn Interlock

Product Model: H-MTiL

ENEX i-LOCK Series H-MTiL is the heavy industry multi-turn Mechanical Trapped Key Safety Interlock product range. It is suitable for a wide range of multi turn equipment such as gear boxes, gate valves and globe valves. The H-MTiL ‘Patented’ lock portions and keys allow for either dual or single trapped key sequential or standalone operational procedures.

The basic principle of this safety equipment is to lock the host equipment at a predetermined position such as fully open &/or fully closed. For dual key system requirements, only if both rotary keys are inserted and rotated 90°, will the internal locking mechanism housed within the ENEX i-LOCK be released allowing the host equipment to be operated. For single key systems, inserting and rotating the individual key, will release the ENEX i-LOCK internal locking mechanism allowing the host equipment to be operated.

Each lock portion and rotary key is uniquely coded to allow a truly safe operating sequence procedure. Once the host equipment operation has commenced, the initially inserted key will be trapped and only when the host equipment has reached the opposing predetermined position will the next sequential key be released.

H-MTiL product range can be supplied with on/off switches and proximity limit sensors to confirm :

  • Key entry rotation or key removal rotation
  • Valve locked open &/or closed positioning

  • Chemical
  • Marine
  • Mining
  • Mineral & Cement
  • Oil & Gas
  • Petrochemical
  • Power Generation
  • Pulp & Paper
  • Refining
  • Water & Utilities

  • PSV (Pressure Safety Valve) Systems
  • Pig Trap Loading / Unloading Systems
  • Valve Isolation Requirements
  • Transfer Flow Line Systems

  • SHELL DEP Specification
  • EQUINOR TR2315 Final Ver 5.02
  • ISO/TS 19837:2018 - Technical Specification
  • ISO 14119:2013 (formally EN1088)
  • Salt Mist Test (Lloyds Test Spec No 1)
  • Fire Test (API 607 & ISO 10497:2010)
  • High Temp Test 70c (EN 60068-2-2:2007)
  • High Humidity Test (EN 60068-2-2:2007)
  • Static and Dynamic Inclination (IEC 60092-504:2001)
  • Ultra Low Temp -57c (EN 60068-2-1:2007)
  • Vibration Test (EN 60068-2-6:2008)
  • Ingress Protection Test (EN 60529:1992 Amd 1&2)
  • Directive 2006/42/EC

  • UK Designed, Engineered, Manufactured, Assembled & Tested Products
  • Minimum 3 billion - billion! ‘unique’ Rotary Key Code permutations from the ‘Patented’ Lock Portion & Key Design. We stopped counting at 3 billion !
  • Ultimate Safe and Secure Mechanical Interlock Design.
  • Defeat, override & tamperproof compliant
  • Solid and robust construction with no cast parts
  • Materials of construction : Stainless Steel
  • Unique ‘Patented’ Lock Portion & Key Design.
  • Lock Portion and Key Design have been tested to over 200’000 cycles
  • Lock Portion and Keys include ‘over torque’ protection mechanism as standard
  • Tamper proof and copy proof body housing, lock portions and keys
  • Unique ENEX i-LOCK tamper proof securing bolts
  • Unique on the ‘Patented’ key is that the code and drive members function independently
  • One single Master Key covers site installed Key Code permutations
  • Ultimate product design for normal, harsh and corrosive environments
  • Spring loaded Lock Portion Ingress Protection & Weather Seals Dust Caps
  • Can be installed to host equipment under live process conditions
  • No interference or intrusion with of the host equipment pressure envelope
  • Anchor & Adaptor units designed and manufactured to suit the host equipment
  • Product serial number traceability on every unit
  • Secure mechanical fixing of all labels and tags
  • Full colour coded key & dust cap tagging option for enhanced error elimination
  • Pad lockable dust covers are an option for lockout hasp and scissor hasps operation

ItemPart DescriptionMaterial
1BodyStainless Steel AISI 316L
2Top & bottom bearingsNylon
3Main drive unitStainless Steel AISI 316L
4Lock portion & ingress protection capsStainless Steel AISI 316L
5Internal locking mechanismStainless Steel AISI 316L
6Counting mechanismStainless Steel AISI 316L
7Body securing bolts & fastenersStainless Steel A2 class 70
8Hand wheel (if possible original valve handwheel will be reused, if not) will be supplied to nearest original equipment sizeOriginal Handwheel or St/St 316L
9Anchor & Adaptor (bespoke design to suit host equipment, not shown)Stainless Steel AISI 316L
10KeysStainless Steel AISI 316L
11Name plate, lock portion and key tagsTroPly

Model No.Height

(Note : dimensions are excluding anchor, adaptor and hand wheel)

1. 2.3.4. 5.6. 7.
HHeavy Industry
MTMulti-Turn Interlock
Standard if un-coded
Son/off switch
S(Ex)Ex rated on/off switch
LLimit sensor
L(Ex)Ex rated limit sensor
OSingle key – locked open only
CSingle key – locked closed onl
DDuel key – locked open & locked closed
 Standard if un-coded
XSpecial Build