Abstract: A dispensing nozzle for a liquid composition having a needle valve and a reinforced tubular seal. The seal has an upper disc-like portion which is secured in place and a lower tubular extension. The tubular extension has an internal tapered bore such that its lower end is narrower than its upper end. The lower end of the bore grips the outer surface of the needle valve and stretches and contracts with its movement. The inner bore of the seal above the lower end is held clear of the needle valve member by a helical spring.

Abstract: The apparatus and method disclosed rely on the observation of a strip of a rotatable circular can end to be lined with gasketing composition, and the scanning head further includes a proximity detector responsive to the positioning of the can end adjacent the scanning head and connected to trigger initiation of a "scanning window" when a can end arrives concentrically in the lining chuck at the lining station, and to discontinue the "scanning window" when the can end and chuck begin to descend on departure of the can end for onward transport. The scanning operation is totally independent of time and therefore of the adjustable speed of operation of the can end lining machine.

Abstract: A seal for a longitudinally movable element such as a needle valve. The seal has an upper disc-like portion which is secured in place and a lower tubular extension. The tubular extension has an internal tapered bore such that the lower end of the bore is narrower than the upper end of the bore. The lower end of the bore intimately grips the outer surface of the longitudinally movable element and stretches and retracts with its movement.