内装压力开关以保护泵运转时不受损坏。
Install pressure switch inside to prevent the pump from damaging.
填料压盖不能拧得过紧，保持液体有滴状泄漏，否则泵运转时可能导致填料烧坏。
Packing gland can't be screwed too tight, keep liquid leaking drop by drop, otherwise it maybe cause to packing burn down.
泵运转时，不仅可以完成自吸过程，而且可以将自循环射流器上的阀门关闭，射流器同时停止工作。
When the pump starts working, the self-priming process can be achieved, and the valve of water-ejecting will be shut off automatically to stop the working of jet flow system simultaneously.
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