How to buy stainless steel deep well pump, SP pump?

How to choose stainless steel deep well pump, SP pump 1. First pay attention to view the material, stainless steel is divided into 201,202,304,316 and so on. Do not think when buying the factory to ignore this large-scale, selling products must be designated pump material, including pump parts, 2. Pump is divided into several major parts: impeller, guide vane, shaft, most of the pump body. 3. When buying stainless steel pump (no specified material, the general factory in accordance with the ordinary stainless steel pump) refers to the impeller, guide vane, shaft, all stainless steel pump body, you need to remind the next: 304 material, (304 material is divided into industrial stainless steel And food stainless steel) Consider food grade 304 or 316 stainless steel for human consumption. 4. Inverted horse-type submersible motor is divided into oil-filled and filled with water to cool the motor, oil-filled motor oil easy to leak, easy to cause water pollution. 5. Reverse horse-type submersible motor water-filled use of the process, before starting the machine must add water, and tighten the motor seal water chamber screws, if not tighten the motor is running the stator heat caused by water leakage, the second run dry Cool down the motor. 6 buy reverse horse submersible motor cable is generally about 3 meters, according to the use of the environment, please choose one-time to the control system, to avoid short-circuit in the connection process and so on. 7. Must have a check valve at the outlet This will help pump work to prevent water hammer phenomenon.