WQ() series new generation submersible sewage pump has the following features: The special cable production process can prevent water leak to motor cabinet when cable cover is broken or the front of cable is submersed Specially designed submersible motor with the protection level of IPX8, insulation class F. The allowed temperature rise is high, submerged cooling effect is good, the actual temperature rise is low, motor insulation life is long, it ensures that the motor can automatically cut off the power supply in abnormal condition The product is fitted with outside frameworks oil seal and double-mechanical seal. The hydraulic lifter which is installed inside oil chamber ensures the lubrication of mechanical seal when the oil level is low. Prolong the service life of the seal, the sealing performance is more reliable, effectively ensuring the continuous safe operation of product. (This kind of technology is a patent of Tsurumi Pump) The design of automatic vent valve enables the pump to exhaust air automatically when pumping water (This kind of technology is a patent of Tsurumi Pump) The impeller adopts semi-closed and open shape of double-channel design. Because of symmetric channel, it is well balanced stable running, small vibration, long service life and energy saving