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美国“伐尔蒙”(Valmont)工厂于1952年首次制造成功“伐利”(Valley)时针式喷灌机(又称元形喷灌机或中心轴座式喷灌机),是生产这种喷灌机历史最久的工厂之一,至目前已售出两万多台。该厂生产的时针式喷灌机分水力驱动和电力驱动的两种。这两种喷灌机除驱动的动力不同外,主要区别在于水管的支撑方法不同,前者是钢索悬吊结构,而后者为弓形桁架结构。水力驱动时针式喷灌机的外形如图1。
The first Valmont plant in the United States to make a successful “Valley” hourglass (also known as an elemental or center-pivoted) in 1952 was the production of such a sprinkler One of the oldest factories, so far sold more than 20,000 Taiwan. The factory production of hour-type irrigation machines and hydraulic drive-driven two. In addition to the driving power of these two irrigation machines are different, the main difference is that the water pipe support method is different, the former is the cable suspension structure, while the latter is arched truss structure. The shape of the water-driven hour-and-arrow irrigation machine is shown in FIG. 1.