Supply:submersible pumps|submersible motor pumps☆Fujian GlongElectric WORKING PRINCIPLE QDX type submersible motor pumps is mainly composed by three parts: pumps, mechanical seal and motor. Pumps is at the bottom part of motor pumps, which adopt centrifugal impeller. Motor is at the upper part of motor pump and is a single-phase asynchronous motor or three-phase motor. Mechanical seal is between pump and motor, and it`s a kind of double end mechanical seal, "O" rings are applied in all static joints of the submersible pump. Inner-installed protector prevents the pump from damages due to abnormal power, clog and overload etc. MATERIAL AND WORKING LIMITS Pump body: Cast iron Motor body: Aluminium Impeller: Cast iron/Aluminium Mechanical seal: Stainless steel/Carbon-ceramic Shaft: 45steel or stainless iron Bearing: SKF/NTN/NSK/China Insulation class: B/F Protection class: IP68