초록 ▼

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

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.

대표청구항 ▼

A dispensing means for dispensing liquid compositions comprising a dispensing chamber having an inlet and an outlet, a longitudinally movable valve means intimately fitting into the outlet for sealing off the outlet, an actuating means for selectively moving the longitudinally movable valve means, a

A dispensing means for dispensing liquid compositions comprising a dispensing chamber having an inlet and an outlet, a longitudinally movable valve means intimately fitting into the outlet for sealing off the outlet, an actuating means for selectively moving the longitudinally movable valve means, a sealing means between the valve means and the actuating means to prevent egress of liquids to the actuating means, the sealing means having a first end adjacent the actuating means, the first end having a disc-like portion which is clamped to the dispensing chamber adjacent to the actuating means, the sealing means having a second end remote from the first end, the sealing means having an internal bore from the first end to the second end through which the valve means extends, the internal bore having a tapered cross section with a larger cross section near the first end and a narrower cross section near the second end and the valve means being intimately gripped by the internal bore of the sealing means at the second end.