Importance

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Abstract

Disclosed is a liquid metering valve unit, particularly for water. The unit uses a dash-pot mechanism filled with metering liquid such as water, silicone oil or a mixture of water and glycerine. The dash-pot mechanism is a closed system. The unit comprises a sleeve member having an axial bore and a transverse bore communicating with the axial bore. One end of the axial bore connects to a liquid supply and the transverse bore connects to an outlet. A valve stem in the axial bore is slidable between an open position and a closed position in which a resilient seat washer seals the end of the axial bore. A spring biasses the stem toward the closed position and the stem can be manually moved to the open position. Movement of the stem to the closed position is controlled by a dash-pot mechanism or regulating means comprising a cup washer secured to the stem and disposed within a liquid-filled chamber betwen the stem and sleeve. The chamber is divided into two portions by the cup washer, which portions are interconnected by passageways within the stem. One of the passageways contains a compressible wad of porous material and movement of the valve towards the open position causes the cup washer to collapse to allow water to move from the first portion of the chamber to the second portion. Movement of the valve toward the closed position causes the cup washer to seal the second portion of the chamber from the first and force metering liquid to flow through the compressible wad, which regulates closing time of the valve.

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First Claim