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Spring-valve.

One in which the valve is held to its seat by a spring, except as temporarily depressed by the hand to allow the flow of water.

The valve-stem has a fixed and a removable disk. The former constitutes the valve, and the latter forms a bearing for one end of a spiral spring, the other end of which rests against a perforated disk fixed in the case. The valve-seat is of rubber. The water is admitted by depression of the stem.

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