Line Blind Valves – Cam-Set, Cam-Slide & Stacey

Contributors: R Stanley

The SchuF Group designs and manufactures a fast, easy to use and safety conscious Line Blind Valve range. They are often refered to as spectacle blinds, figure of eights, or blinding systems.

Cam-Set Line Blind System

Line Blind Valve - Cam-Set,  Photo: ©SchuF

Industry Using Line Blinding Systems

Their primary use is to completely close off the downstream portion of a pipeline in a safe way. They are frequently found in the Petrochemical, Steel, Pulp and Paper, Maritime and Oil & Refinery industries. They are often refered to as spectacle blinds, figures of eight, spectacle plates or paddle blinds.

Line Blind Valve Applications

Positive pipeline close/off is vital in many piping systems to assure safety of personnel working on downstream equipment, particularly when flammable, toxic liquids or gases could seep past a closure. When visible proof of shut/off is necessary, a line blind is mandatory to comply with plant safety regulations. Available in three variants as Cam-Set, Cam-Slide or Stacey Line Blind Valves.


Cam-Set Side View Cam-Set Closed
Lind Blind - Cam Set Side View Line Blind - Cam Set Closed View

                                              SchuF Line Blinds, Photo:©SchuF

Key Characteristics of the SchuF Cam-Set

  • Absolute positive Shut-Off
  • No spreading of pipe required
  • Seal unaffected by piping misalignment
  • Simple, one man, spectacle changing from one side of the line
  • 316 SST as standard, other materials upon request
  • Special anti corrosive coatings such as epoxy, polyurethane and Sermetel ceramic are available if required 

Spectacle Blind Valve Sizing

The Fetterolf Cam-Set Line Blind Valve is available in sizes ranging from 1 to 48 inch (larger on request) and can be supplied in 150, 300 and 600 ASME ratings. Other sizes and pressure ratings are available on request.

Line blind installed in hydrotreating plant Offshore (on FPSO) line blind installation

Cam-Set Line Blind installed in a refinery and offshore on a FPSO
Photos: ©SchuF

Materials used in Line Blind Valves

Line Blinds are available in carbon steel, stainless steel (316 SST) as standard. Others materials are application and request dependant.



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For further information, pricing or a brochure, please contact us at:


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