Sliding Spectacle Blinds
Sliding blinds are a more permanent form of blanking spade, combining the function of the blanking spade with that of a ring spacer. They are built into the pipeline as a wafer fitting and require the flange bolting to be loosened in order for it to be slid into either its closed or open position. Manufactured from solid PTFE in their open state they allow unhindered flow through the pipeline, when slid into their closed position they positively and effectively seal the pipeline, preventing any flow and protecting plant and personnel. They have the advantage over blanking spades of it being quite clear as to whether the blind is in the open or closed position. The slotted holes fit the bolting and align the blind within the flange joint.
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