SAFETY COVER FOR PRESSURE VESSEL

摘要

A safety cap for a pressurized cylinder carries tabs (24). The cap (14) is rotatable so that the tabs become positioned above circumferentially spaced surfaces of grooves (32) formed in the cap to prevent longitudinal removal of the cap. The surfaces of the grooves (32) extend circumferentially of the cap, and are disposed loosely relative to the tabs when the cap is secured. The surfaces may comprise parts of grooves (32) formed in outwardly open channels (28) of the cap.