and flow control valve with bi-level vertical float is a hydraulically operated, diaphragm actuated control valve that controls reservoir filling. the valve hydraulically opens at pre-set low level and shuts off at pre-set high level. during filling, it limits the flow to preset maximum, regardless of...
yellow dust: it comes from arid region such as china and other arid countries by strong wind together with cloud of dust. it inflames your eyes, nasal passages and throat leading to allergic reactions and, eyes, nose and other respiratory diseases. fine dust: it is caused by artificial pollutants which...