A tap control mechanism operates between fixed stops which may be formed by the ends of a cam slot which receives a pin 5 on a spindle 2 with a screw threaded end (Fig. 1) fitting into an axially-movable closure member 3. It may be adjustable so as to accommodate different "Seat Depths" adopted by individual manufacturers making it acceptable as a replacement unit. The mechanism may operate with a 90 DEG action from open to closed position and the cam slot may have a flat part providing a 'parked' position and be so shaped that the closing tongue is reduced to almost zero for easy operation. The compression of the washer onto the seal can be preset then locked to repeat for all subsequent closing cycles until such time as further compression is required due to washer wear when the adjustments may be repeated. IMAGE
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