KLD-20series mini electric valves are a kind of microminiature valves. The integration of the actuator and the body reduces the volume greatly, so it offers convenience for the instruments and small equipments. Ball and body are adopted good floating seal structure, which lowers the torsion and avoids the ineffectiveness of swithch caused by the scale. Now this series have widely been applied to pipeline of central heating/central air conditioner/slow power/water-saving equipment/environment protection project/water supply and drainage/water treatment/prepaid water meter/industrial automatic control,etc.