Spectacle Blinds

Spectacle Blinds, often referred to as Figure-8 Blinds, are mechanical devices used to isolate sections of a pipeline for maintenance, inspection, or system modification. They consist of two metal discs connected by a small section: one solid disc (the blind or spade) and one ring-shaped disc (the spacer). They are called "Spectacle Blinds" because their shape resembles a pair of eyeglasses. In operation, they can be rotated to place either the solid disc to block flow or the ring-shaped disc to allow flow through the pipeline, providing a quick and efficient means of isolating or opening sections of the system.

Choosing the right Spectacle Blind involves several factors, including the size of the pipeline, the pressure class of the system, and the material compatibility with the fluid being transported. Spectacle Blinds are classified by ANSI pressure classes (such as Class 150, Class 300, and Class 600) and are available for pipe sizes typically ranging from 1/2" up to 20" and larger. It's essential to select a Spectacle Blind that matches the pressure rating and pipe size of your system to ensure a proper fit and to maintain system integrity. Additionally, consider the material of the blind for compatibility with your process fluid to prevent corrosion or degradation.

Yes, Spectacle Blinds can be customised to meet specific operational requirements. This customisation can include the selection of materials to ensure compatibility with the process fluid and operating environment, as well as modifications to dimensions to fit non-standard pipe sizes or configurations. Special coatings and treatments can also be applied to increase corrosion resistance or meet specific industry standards. When ordering custom Spectacle Blinds, it's important to provide detailed specifications to the manufacturer, such as Purple Engineering, to ensure the final product meets your exact needs.