This advanced V(WQ) series, a branch of single-phase drainage pumps, will be your ideal drainage helper. The letter "V" which subsitutes for the letters "WQ" indicates the distinct design of the filter and the broadness of the high efficient area. It can work safetly and efficiently at high flux with the feature of complet heads. The design of V180F and V250F are designed to a wide tunnel which helps to convey the long fiber liquid or the solid whose diameter is about 15mm. The design of V450F and V750F is designed to a wide tunnel which helps to convery the long fiber liquid or the solid whose diameter is about 25mm. The design of V1100F is designed to a wide tunnel which helps to convey the long fiber liquid or the solid whose diameter is about 35mm. The design of V1500F is designed to a wide tunnel which helps to convey the long fiber liquid or the solid whose diameter is about 10mm. The design of V2200F is designed to a wide tunnel which helps to convey the long fiber liquid or the solid whose diameter is about 20mm. The selection of bottom suction structure, stainless steel and special cast iron make the pump have the capabilities of complete drain and high resistance of abrasion and corrosion. The float switch can automatically control on and off with the chane of the liquid level. The protector in the motor can automatically cut off the power when it is overheated or over currented, thus guarantee the security and reliability of pump's run even in the atrocious environment.