自1978年3月五种 py_1系列喷头(py_120、py_130、py_140、py_150和 py_160)通过鉴定并在全国推广之后,今年1月又有五种 py_1系列喷头(py_110、py_115、py_110sh、py_115sh 和 py_120sh)通过鉴定。新搞的五种 py_1系列喷头仍是金属摇臂式喷头,但口径偏小,喷灌强度低,适合大型喷灌机或固定式、移动管道式、自压式等喷灌系统使用。这五种喷头增加了py_1系列喷头的规格,填补了小型摇臂金属喷头的空 Since January 1978, five py_1 series of heads (py_120, py_130, py_140, py_150 and py_160) have been identified and popularized nationwide. In January of this year, there are five py_1 series of heads (py_110, py_115, py_110sh, py_115sh and py_120sh) Through the identification. The newly developed five py_1 series spray heads are still metal rocker nozzles, but their small caliber and low sprinkling strength make them suitable for large sprinklers or fixed sprinkler systems such as mobile pipelines and self-pressurizing sprinkler systems. These five nozzles increase the specifications of the py_1 series of nozzles to fill the air gap of a small rocker metal nozzle