| 摘要 |
<p>An improved venturi eductor (20) for proportional dispensing of chemicals into flowing water includes a large anti-siphoning air gap section (58). The air gap section (58) includes an outer wall (52) and an inner wall (54) with a gap between the walls. Both walls include offset vents or windows (50, 63) that provide an indirect path from the center of the air gap (58) to the exterior of the eductor (20). The eductor (20) is made from several molded parts that may be assembled without requiring machining. Further, eductor (20) has a unique spray shield (66) design that more effectively controls water splash in the eductor section (36) and simplifies assembly. Inner walls (54) can be eliminated where the included angle between the walls (26) at the entry end of the eductor insert (68) is in the range of 5° to 25°, for example.</p> |
