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    • 3. 发明授权
    • Back flow prevention device
    • 防回流装置
    • US5678592A
    • 1997-10-21
    • US624848
    • 1996-03-26
    • John A. BotickiJames H. LohrCharles E. Seaman, Jr.
    • John A. BotickiJames H. LohrCharles E. Seaman, Jr.
    • E03C1/10F16K24/04
    • E03C1/102E03C1/104Y10T137/3185Y10T137/87587Y10T137/877Y10T137/8807Y10T137/9464
    • Disclosed is an improved device (10) for preventing back flow of possibly-contaminated water into a potable water system. The device (10) includes first, second and third nozzles (33, 35, 37) in series flow relationship, and an air gap (49) between the first and second nozzles (33, 35). In the improvement, the air gap (49) is a primary air gap and the device (10) includes a secondary air gap (19) fixed with respect to the second nozzle (35). In a more specific aspect of the new device (10), the second and third nozzles (35, 37) are in a tubular housing (41) and the device (10) includes a containment bowl (21) around the housing (41). The secondary air gap (19) includes an aperture (53) in the housing wall (55) and such aperture (53) opens to the containment bowl (21). Other aspects of the new device (10 involve particular nozzle configurations and relationships and a restrictor (103) inhibiting back flow.
    • 公开了一种改进的装置(10),用于防止可能受污染的水回流到饮用水系统中。 该装置(10)包括串联流动关系的第一,第二和第三喷嘴(33,35,37)和在第一和第二喷嘴(33,35)之间的气隙(49)。 在此改进中,气隙(49)是主气隙,并且装置(10)包括相对于第二喷嘴(35)固定的二次气隙(​​19)。 在新装置(10)的更具体的方面,第二和第三喷嘴(35,37)处于管状壳体(41)中,并且装置(10)包括围绕壳体(41)的容纳碗(21) 。 二次气隙(​​19)在壳体壁(55)中包括孔(53),并且该孔(53)通向容纳碗(21)。 新设备的其他方面(10涉及特定的喷嘴配置和关系以及限制器(103))抑制回流。
    • 4. 发明授权
    • Non-educting back flow prevention device
    • 非排水回流防止装置
    • US6098651A
    • 2000-08-08
    • US852244
    • 1997-05-06
    • John A. BotickiJames H. LohrCharles E. Seaman, Jr.
    • John A. BotickiJames H. LohrCharles E. Seaman, Jr.
    • E03C1/10F16K24/04
    • E03C1/102E03C1/104
    • Disclosed is a non-educting device (10) for preventing back flow of contaminated water into a potable water system. The device (10) includes first and second nozzles (33, 35) in series flow relationship to one another, an air gap (49) between the first and second nozzles (33, 35) and a water inlet (27). In the improvement, the inlet (27) is the sole liquid inlet of the device (10) and the first nozzle (33) is between the air gap (49) and the inlet (27). Such nozzle (33) includes a tapered portion having an axial length (AL) and a circular discharge opening (59). The ratio of the axial length (AL) to the diameter of the opening (59) is in the range of 0.7 to 1.1. Other features involve a unique containment bowl (21) and a secondary air gap (19) in liquid flow relationship to the containment bowl (21).
    • 公开了一种用于防止受污染的水回流到饮用水系统中的非喷射装置(10)。 装置(10)包括彼此串联流动的第一和第二喷嘴(33,35),第一和第二喷嘴(33,35)之间的空气间隙(49)和进水口(27)。 在改进中,入口(27)是装置(10)的唯一液体入口,并且第一喷嘴(33)在气隙(49)和入口(27)之间。 这种喷嘴(33)包括具有轴向长度(AL)和圆形排出口(59)的锥形部分。 轴向长度(AL)与开口(59)的直径的比率在0.7至1.1的范围内。 其他特征涉及与容纳碗(21)相关的液体流动的独特的容纳碗(21)和二次气隙(​​19)。