• Water supply system,
• condensation system,
• air conditioning system,
• water treatment,
• industrial flushing,
• other specific uses

Material table KQDS25-2, 32-4

Material table KQDS40-8、50-12、50-16、50-20

KQDS25-2,32-4

KQDS40-8, 50-12, 50-16, 50-20

• When installing the pump, attention should be paid to the height difference between the suction liquid level and the pump water inlet to ensure that when the pump is working, the sum of the pressure loss in the suction pipeline, the liquid saturated vapor pressure and the height difference does not exceed the capacity of the pump. Allow vacuum height to be drawn up.
• In order to prevent debris in the pipeline from entering the pump, a filter should be installed in the water inlet pipeline, and its flow cross-section should be greater than twice the cross-section of the pipe.

• The water pump must be installed on the foundation. Place the pump on the foundation and use a level to check the level of the base.
• When installing the water inlet and outlet pipes, their connection directions should be consistent with the marks on the base. And care should be taken not to concentrate the weight and stress of the pipeline on the pump.
• Check whether the power supply voltage and frequency are consistent with the motor nameplate, and check whether the flow rate and head of the water pump are consistent with the production requirements.

When wiring the motor, the power supply must be disconnected.

The motor needs to be connected to an external terminal with a switch.

When installing on suction, a check valve must be installed at the suction port

1. Preparation before starting

(1) Clean the pump and site before starting

(2) Check the insulation resistance of the motor winding to ground.

(3) Check whether the expansion bolts are loose and whether the pipe connecting flange bolts are tightened.

(4) Close the outlet valve and related instruments, fill the pump with working fluid, and discharge the air.

2. Start and run

(1) Check whether the motor rotation is correct by turning on the power for 1-2 seconds and observing the pump shaft rotation. Looking forward from the inlet end, the correct rotation should be clockwise. If the direction of rotation is reversed, the wiring between any two-phase power supply and motor terminals should be replaced. Then reinstall the outlet box cover.

(2) Check whether the inlet valve is fully open, start the motor officially, and then slowly open the outlet valve

(3) Use the outlet valve to adjust the flow of the water pump. The water pump should be strictly controlled to operate within the rated flow range to avoid motor overload. Note that the inlet valve cannot be used to adjust the flow to avoid cavitation.

(4) Frequently check whether the expansion bolts are loose, the outlet pressure gauge fluctuates and the water pump vibrates.

(5) Pay attention to whether there is any noise when the pump is running. If any abnormality is found, stop it for inspection and eliminate it in time.

(6) After long-term operation, if the flow rate and pressure drop significantly, the water pump should be disassembled for inspection and worn parts should be replaced, such as the middle section, impeller and motor bearings, etc.

3. Shutdown

(1) Slowly close the outlet valve and related instruments

(2) Cut off the power supply.

4. Precautions during use:

(1) It is strictly forbidden to run the pump with power and no load when there is no water in the pump. Doing so will damage the bearings and mechanical seals because they will not be lubricated.

(2) There should be no air leakage on the water inlet pipe side. If air is sucked in, the water pump cannot operate normally.

KQDS25-2, 32-4 middle section and impeller assembly sequence

A Water inlet section parts ，B Bearing middle part，C middle section，D Water outlet parts

KQDS40-8, 50-12 middle section and impeller assembly sequence

A Water inlet section components，B bearing middle part，C middle section，D water outlet parts

KQDS50-16 middle section and impeller assembly sequence

A Water inlet section components，B bearing middle part，C middle section，D water outlet parts

KQDS50-20 middle section and impeller assembly sequence

A Water inlet section components，B bearing middle part，D water outlet parts

When disassembling according to the reverse steps of the assembly process, pay attention to keeping the impellers, middle sections and inter-stage bushings at all levels in their original combinations to ensure the axial clearance after reassembly.