Spectacle Blind With Butterfly Valve

The slide blind multi is another patented and registered innovative product developed by hot tools based around the design of the original hot tools slide blind valve above which replaces traditional line blind variants such as the spectacle and manual slip blind and reduces operation time by up to 50 the slide blind multi is.

Spectacle blind with butterfly valve. Dimensions of class 150 rf figure 8 blanks views. Line blind provide visual proof that a line is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. 2731 dimensions of class 300 rf figure 8 blanks. A spectacle blind or spec blind abbreviated as sb is a safety device used to isolate a section of line or piece of equipment when the line or equipment needs to be inspected or removed from service.

This standard covers the spectacle blind spades and spacers with pressure class 150 300 600 900 1500 and 2500 as listed in asme b16 5. To stop the flow in the pipeline the blind end is rotated into place between the flanges. Sometimes people use term spec blind flanges or brake flange but you should know that they are two different items. The flow can be diverted to other items of equipment but not just bypassed around the blank as this would compromise the safety function of the spectacle blind.

This positively isolates the downstream piping and equipment. Here i have shown three different arrangements of the disk with respect to a center of the valve body. During normal operation the open end is installed as a spacer to allow uninterrupted flow. A butterfly valve is used in many different fluid services and they perform well in slurry applications also.

Asme b16 48 standard that covers line blanks. The disk of butterfly valve can be concentric or eccentric with the valve body. Spectacle blinds are simple safety devices that are installed between two pipe flanges. List of articles in category spectacle blind rf dimensions.

Butterfly valve dimensions wafer and lugged type butterfly valve dimensions flanged type butterfy valve dimensions triple offset type.