Importance

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Abstract

A slow-closing valve mechanism for controlling metered flow of water for a predetermined time interval from a main inlet to a main outlet in which a timing chamber is provided with a valve seat at one end and an inwardly adjacent main flow inlet and a bleeder opening at its opposite end. A reciprocable valve stem extends through the valve seat and carries a main valve that is biased towards the seat by a relatively long low rate coiled spring surrounding the stem, and also carries a piston that is movable in a valve opening direction by a manually operable actuator at the outer end of the stem, and in a timed valve closing direction at a rate determined by a fixed hydraulic flow passage of an elongate capillary tube connected with the bleeder opening, this tube being coiled externally of the timing chamber and having its inlet in communication with the main inlet flow passage. The valve closure timing interval is variable by means of an axially adjustable end cap extension on the outer end of the stem, which is engageable by the manual actuator to effect opening of the main valve a distance as determined by engagement of the end cap extension with a fixed abutment stop.

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First Claim