Importance

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Abstract

Apparatus for injecting ammonia into water, or more particularly, into hard water. Apparatus includes a check valve having a plurality of spaced recessed annuli therearound communicating with an axially disposed bore through orifices or ports interconnecting the bore with the annuli. Annuli profile is characterized by sharp right angle edges defining the outer and inner diameters with no tapered O-ring seat portions therebetween. O-rings are fitted around the annuli in pressure sealing relationship and make line contact only with the outer sharp edges or diameters of the annuli, thus providing a faster responding and more sensitive valve to minor adjustments in ammonia pressure than check valves with tapered seats for the O-rings as well as being devoid of tapered surfaces upon which hard insoluble calcium deposits or scale tend to form when ammonia is added to water.

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First Claim