KQDP/KQDQ Stainless Steel Multi-Stage Pump
The third generation KQDP/KQDQ lightweight vertical multi-stage centrifugal pump is a product based on the design concept of energy saving, environmental protection, safety and reliability, and adopts new industrial and hydraulic design methods. The products are suitable for different temperature, flow and pressure ranges, and can transport various media from tap water to industrial liquids. They are widely used in water supply, industrial pressurization, industrial liquid transportation, HVAC, irrigation and water treatment, among which KQDQ It can also be used in beverages, medicine and other fields. KQDP is suitable for non-corrosive liquids, and KQDQ is suitable for mildly corrosive liquids.
This product complies with the GB/T 5657 <<Technical Conditions for Centrifugal Pumps (III)>> standard.Product introduction
- Working Conditions
- Model Description
- Water Pump Steering
- Motor Junction Box Location
- Installation and Connection
- Water Pump Installation
Speed: 2900 r/min (50Hz)
Liquid: clean water or liquid with physical and chemical properties similar to water
Liquid temperature: -20-70°C; 70-120°C (high temperature configuration)
Ambient temperature: maximum +40°C,
Altitude: height less than 1000m
Maximum working pressure: suction pressure + pump maximum pressure < 2.5Mpa
Maximum suction height: When using it, users should consider the impact of various factors on use. The maximum suction height H should be lower than the calculated value below (negative values indicate backflow). Otherwise, the pump will not work properly.
H=Pbx10.2-NPSH-Hf-Hv-Hs
Pb = local atmospheric pressure bar (sea level 1bar)
NPSH=NPSH m
Hf=Inlet pipe loss m
Hv=liquid saturated vapor pressure m
Hs=safety margin m (minimum 0.5m)
Example: Assuming atmospheric pressure Pb=1bar, pump NPSH=2m, suction pipeline loss Hf=2.2m,
(1) When the liquid temperature is 20°C, the saturated vapor pressure Hv=0.23m
H=1×10.2-2-2.2-0.23-0.5= 5.27m
(2) When the liquid temperature is 85°C, the saturated vapor pressure Hv=5. 89m
H=1×10.2-2-2-5.89-0.5= -0.39m pump needs to be poured back
The temperature of the liquid delivered by the pump is inconsistent, and the suction height is also different when the other operating conditions of the pump are the same.
| Water temperature℃ | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 85 | 90 | 95 | 100 | 105 |
| Saturated vapor pressure m | 0.23 | 0.43 | 0.75 | 1.26 | 2.03 | 3.18 | 4.83 | 5.89 | 7.15 | 8.62 | 10.33 | 12.32 |
KQDP and KQDQ rotate counterclockwise when viewed from the driving end.
For KQDP and KQDQ, when viewed from the motor side, the junction box is on the water outlet side.
*The installation position of the junction box can be changed, please indicate it in the order.
Note: KQDP25, 32, and 40 are equipped with round flanges as standard, and cast iron oval flanges (threaded interface) are optional.
KQDQ25 and 32 are equipped with round flange as standard, and bayonet type and external pipe threaded connection are optional.
KQDQ40 comes standard with a round flange and optional bayonet connection.
KQDP/Q50, 65, 80, 100, and 150 are equipped with round flanges as standard, among which KQDQ50 is optional with bayonet connection.
Special instructions: 1. The oval flange connection has a pressure resistance level of 1.6Mpa and below. If it is greater than 1.6Mpa, please use a round flange connection;
- All standard flanges comply with GB/T17241.6-2008 design standards, with a pressure rating of 2.5 MPa;
- Matching flanges and pipe clamps for pipeline connection must be ordered separately.
- 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. - The pump is installed vertically. To ensure that the motor is fully cooled, the motor cannot be turned upside down.
- Before installing the pump, the pipeline system should be cleaned, and no particulate matter should be left in the pipeline. At the same time, a filter should be installed 0.5-1m in front of the pump suction inlet to ensure the normal operation of the water pump.
- When installing on suction, a check valve must be installed at the suction port.
KQDP and KQDQ series water pumps are light vertical multi-stage centrifugal pumps. The motor is above the pump and is directly connected to the pump shaft through a jacket coupling. The water pump inlet and outlet are aligned on the base.
The shaft seal adopts a cartridge mechanical seal, and its dynamic and static ring friction pairs are made of carbide versus graphite, which has good sealing effect and long service life. The middle section of the impeller is made of stainless steel. The shaft and outer shell are also made of stainless steel. The pump body is compact in structure and light in weight.
100 caliber and below:
KQDQ type: all flow-passing parts are made of 304 stainless steel (imported steel plate), and the bracket is HT
KQDP type: The impeller and middle section flow parts are made of 304 stainless steel (imported steel plate), the water inlet and outlet sections and brackets are made of HT
150 caliber and above:
KQDQ type: all flow parts are made of 304 stainless steel, and the bracket is QT
KQDP type: The impeller and middle flow parts are made of 304 stainless steel, the inlet and outlet sections and brackets are made of QT
The transported liquid enters the impeller from the water inlet of the inlet and outlet section. Under the action of the high-speed rotating impeller, the liquid enters the second-stage impeller through the middle guide vane. This continues, and finally the liquid enters the jacket formed between the outer casing and the middle section and exits from the inlet and outlet section. Water outlet discharge.
The axial thrust of this series of pumps is borne by the motor bearings. When users overhaul the water pump, they should also replace the bearings of the motor.