Â Â Â 1, Sludge return pump rotation smooth, no stuck, stagnation, vibration and so on. Â Â Â 2, sludge return pump seal air pressure test, test pressure of 0.2Mpa. Â Â Â 3, sludge return pump with dual mechanical seal structure and lip seal structure, mechanical seal to ensure reliable operation within 10,000 hours without replacement. Â Â Â 4, Sludge return pump leads to the cable YZW type rubber cover soft cable or other cable with the same performance, cable sealing head with special vulcanization, to prevent damage to the cable jacket and water seepage to the motor. Â Â Â 5, Sludge return pump oil chamber with a sealed leak protection device. Â Â Â 6, Sludge return pump leads to two-color line (yellow / green) provisions for the ground wire, the connection is reliable. Ground mark is obvious, not easy to wear out during use. Â Â Â 7, Sludge return pump motor rotor dynamic balancing test, the balance accuracy of G6.3. Â Â Â 8, sludge return pump motor stator winding with thermal protection switch. Â Â Â 9, Sludge return pump during operation, the power supply voltage, frequency and the deviation of the rated value and the impact on motor performance and temperature rise in line with the provisions of GB755, the electrical performance of the motor in line with JB / T8092, JB / Z346, GB5013.4 Provisions. Â Â Â 10, Sludge return pump in the rail bracket free up and down, can be quickly coupled with the embedded return pipe, smooth and reliable operation.