SITEMA Locking unit (certified by Lloyd´s Register)

Product catalog summary

Introduction
The SITEMA Locking Unit KFHL is designed to clamp a shaft in any position, commonly used on cylinder rods or round shafts, holding axial forces in both directions. It is specifically developed for maritime applications, ensuring safe operation under challenging conditions like exposure to sea water.

Specifications
The unit is certified by Lloyd’s Register and features a holding force that is at least twice the admissible load, with a permissible working pressure of 160 bar. The unit is available in various sizes, accommodating rod diameters from 18mm to 125mm.

Design and Materials
The unit is constructed with materials and coatings that protect against sea water hazards. The rod must meet specific surface requirements, including ISO tolerance field f7 or h6, surface roughness Rz = 1 to 4 µm, and a hardened surface.

Operation and Control
The unit operates by spring force with hydraulic releasing. A 3/2-way valve is typically used for actuation, ensuring the unit secures the rod during power failures or emergencies. Proximity switches monitor the clamped and unclamped states.

Maintenance and Testing
Regular functional checks are required at least every six months to ensure safety. Maintenance is limited to testing the holding force, and any repairs must be conducted by SITEMA.

Compliance and Certification
The unit complies with risk assessment standards DIN EN ISO 14121-1 and is approved by Lloyd’s Register. Each unit must be certified individually by a Lloyd’s official.

Catalog excerpts

SITEMA Locking unit (certified by Lloyd´s Register)-3

Locking by Spring Force / Hydraulic Releasing SITEMA - Locking Unit KFHL Technical Data Sheet TI-F52-EN-03/2010 SITEMA GmbH & Co.KG . Im Mittelfeld 10 . D-76135 Karlsruhe . Phone: +49(0)721/98661-0 . Fax: -11 . www.sitema.com 3/5 Choosing the right size The admissible load M is stated for all types in the pages before. During normal conditions (vertical movement), the criteria load is to be maintained. The holding (braking) force is not less than 2 x M, but will not exceed 3,5 x M. The fixing elements which accept the load must therefore be dimensioned for a 3.5 x M force. This maximum force...

Open the catalog to page 3

SITEMA Locking unit (certified by Lloyd´s Register)-4

Locking by Spring Force / Hydraulic Releasing SITEMA - Locking Unit KFHL Technical Data Sheet TI-F52-EN-03/2010 SITEMA GmbH & Co.KG . Im Mittelfeld 10 . D-76135 Karlsruhe . Phone: +49(0)721/98661-0 . Fax: -11 . www.sitema.com 4/5 Monitoring by proximity switches The proximity switch 1 „Load secured“ signals the secure state and is used to authorise entrance to the danger area. Switch 2 „released“ is used to activate the downward movement of the drive. For automatic detection of failures both signals are compared. In case both switches indicate the same state - apart from minor overlapping periods...

Open the catalog to page 4

SITEMA Locking unit (certified by Lloyd´s Register)-5

Type Approval Certificate SITEMA - Locking Unit KFHL Technical Data Sheet TI-F52-EN-03/2010 SITEMA GmbH & Co.KG . Im Mittelfeld 10 . D-76135 Karlsruhe . Phone: +49(0)721/98661-0 . Fax: -11 . www.sitema.com 5/5

Open the catalog to page 5

SITEMA Locking unit (certified by Lloyd´s Register)

SITEMA Locking unit (certified by Lloyd´s Register)

Catalog excerpts

All SITEMA catalogs and technical brochures