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    • 6. 发明授权
    • Frost free irrigation system and valve therefor
    • 无霜灌溉系统和阀门
    • US4763837A
    • 1988-08-16
    • US63321
    • 1987-06-18
    • Zvi Livneh
    • Zvi Livneh
    • A01G25/16B05B1/00B05B15/00
    • A01G25/16Y10T137/7796
    • In one aspect a novel valve, when used with water conveying conduits of water supply or of irrigation systems, will purge them of residual water in the conduits, when the water supply is "cut off", but will close the system when the water supply is on (e.g. there is water pressure above a predetermined threshold, or a "head" occurs). When this valve is closed the system then operates, conventionally, and for irrigation systems to eject water from water dispensing nozzles or spray heads located at or in proximity to the ground surface so that irrigation can take place. With this novel valve, the periodic (or annual) need to purge the irrigation system of residual water to clean out contaminants or to prevent winter freeze-up is avoided, since self-purging of the residual water and of any water suspended solids in the network takes place each time the water pressure in the system is reduced to approximately zero (or to below the said predetermined threshold pressure), as on each occurance of water shut off. A further embodiment contamplates a compound nozzle valve assembly formed as a single structure housing a conventional water dispensing nozzle, and the novel purging valve. Such compound nozzle valve assembly simplifies installation of the irrigation system and of its subsequent operation and maintenance.
    • 在一个方面,一种新型阀当与供水或灌溉系统的输水管道一起使用时,在供水“切断”时将清除管道中的残留水,但在供水时将关闭系统 (例如有高于预定阈值的水压,或发生“头”)。 当该阀关闭时,系统常规地操作,并且用于灌溉系统以从位于地面或接近地面的水分配喷嘴或喷头喷出水,从而可以进行灌溉。 使用这种新颖的阀门,可以避免周期性(或每年一次)清除灌溉系统的残留水,以清除污染物或防止冬季冻结,因为自来水中的残留水和任何水悬浮固体 每当系统中的水压降低到大约零(或低于所述预定阈值压力)时,网络就会发生,因为每次发生水的关闭。 另一实施例将复制喷嘴阀组件形成为容纳常规水分配喷嘴的单一结构和新颖的清洗阀。 这种复合喷嘴阀组件简化了灌溉系统的安装及其随后的操作和维护。