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La empresa, fundada en 1989, es una empresa nacional de alta tecnología integral que integra diseño, investigación y desarrollo, fabricación y servicios; actualmente es una empresa clave en la industria china de bombas centrífugas y una de las grandes fábricas especializadas.
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Product Center
Vertical multistage pump type DL
Flow: 2-200 m³/h
Lifting height: 23-230m
Power: 1.1-132kw
Efficiency: 23%-78%
Pump weight: 58-1110kg
Cavitation margin: 1.4-4.7m
Price: 0.21-5.98 thousand
It is mainly used for the supply of drinking water in high-rise buildings, constant pressure water supply for fire fighting, automatic irrigation, and water supply for automatic water curtains, etc. It can also be used for water supply and drainage in factories and mines, long-distance water supply, use with various equipment, and various water production processes, etc. The medium's operating temperature does not exceed 80 ℃.
Product Description
Product Parameters
Meaning of the model of the vertical multistage centrifugal pump type DL
For example: 80DL（DLR）×4
80-Nominal diameter of the pump suction inlet (mm)
DL-Vertical segmented multistage centrifugal pump
DLR-Vertical segmented multistage hot water centrifugal pump
4-Number of pump stages
Working conditions and product features of the vertical multistage centrifugal pump type DL:
Working conditions:
1. The medium used in the vertical multistage centrifugal pump type DL should be similar to water, with a kinematic viscosity <150 mm2/s, free of hard particles and corrosive properties;
2. Vertical Multistage pump The altitude of the usage location is below 1000 meters. If exceeded, it must be indicated in the order so that our factory can provide a more reliable product;
3. Medium operating temperature -15℃～120℃;
4. Maximum system working pressure ≤2.5 MPa;
5. Ambient temperature should be below 40℃ and relative humidity below 95%.
Product features:
1. The vertical multistage pump type DL has a compact structure, small size, and attractive appearance. Its vertical structure means a small installation footprint, and its center of gravity coincides with the pump foot center, improving operational stability and pump lifespan.
2. The suction inlet and outlet of the vertical multistage pump type DL are horizontal, simplifying pipe connections.
3. As needed, the suction inlet and outlet can be installed in the same direction or at different angles of 90°, 180°, 270° to meet different connection situations.
4. The lift height of the vertical multistage pump type DL can be increased or decreased as needed by adding or removing pump stages and adjusting the outer diameter cut of the impeller, without changing the installation surface. This is something other pumps do not have.
5. The motor has an additional rain cover, allowing the pump to be placed outdoors, eliminating the pump room and saving construction costs.
6. The rotor of the vertical multistage centrifugal pump type DL has minimal bending, and the selected motor is a 4-pole motor, so it operates stably, with low vibration, low noise, and long service life.
Structural diagram and description of the vertical multistage centrifugal pump type DL
| Serial number | Name | Material or model | Serial number | Name | Material or model |
1 | Motor | Series Y (V5) 4 poles | 12 | Water outlet section | HT200 | |
2 | Coupling | HT200 | 13 | Balance set | HT200 | |
3 | Elastic block | Rubber | 14 | Balance drum | HT200 | |
4 | Bearing cover | HT200 | 15 | Last stage vane guide | HT200 | |
5 | Bearing cover | 45 | 16 | Intermediate section | HT200 | |
6 | Bearing housing | HT200 | 17 | Vane guide | HT200 | |
7 | Bearing | Series 180 | 18 | Impeller | HT200 | |
8 | Water retention set | 45 | 19 | Water outlet section | HT200 | |
9 | Asbestos cover | HT200 | 20 | Lower shaft bushing | 45 | |
10 | Asbestos | Asbestos | 21 | Lower shaft support | Copper alloy | |
11 | Stuffing box body | HT200 | 22 | Shaft | 45, 2Cr13 |
The vertical multistage centrifugal pump type DL consists of two parts: the motor and the pump. The motor is a Y-type three-phase asynchronous motor. The pump and motor are connected by a coupling, with a rigid connection as a whole, requiring no alignment during use. The pump consists of a stator part and a rotor part. The stator part of the pump includes a water inlet section, an intermediate section, a vane guide, a water outlet section, and a stuffing box body, among other parts. To prevent stator wear, the stator is equipped with a sealing ring, a balance set, etc., which can be replaced with spare parts once worn. The rotor part consists of a shaft, an impeller, a balance drum, etc. The lower end of the rotor is a water-lubricated bearing, and the upper part is an angular contact ball bearing. Most of the axial force of the vertical multistage centrifugal pump type DL is borne by the balance drum, and the small remaining part of the axial force is borne by the angular contact ball bearing. The joint surface of the water inlet and outlet sections is sealed with a paper gasket. The shaft sealing uses a stuffing box or a mechanical seal, which the user can choose according to their needs.
The pump rotation direction, viewed from the drive end downward, is counterclockwise.
1. The vertical multistage centrifugal water pump type DL has a compact structure, small size, attractive appearance, and small installation footprint, saving construction costs;
2. The water inlet and outlet of the vertical multistage centrifugal water pump type DL are on the same centerline, simplifying pipe connections;
3. Depending on the actual situation, the inlet and outlet of the DL type vertical multistage centrifugal pump can be installed in different directions of 90°, 180°, 270°;
4. Depending on the actual situation, the outlet of the DL type vertical multistage centrifugal pump can be installed with 1 to 5 outlets to achieve different lift heights on the same pump;
Diagram of the model range of the DL type vertical multistage centrifugal pump
Installation instructions for the DL type vertical multistage centrifugal pump
1. Before installation, check the condition of the pump and the motor.
2. The pump should be installed as close as possible to the water source.
3. There are two methods to install the pump on the base: a rigid connection directly on a cement base, or a flexible connection with a JGD damper.
Refer to the installation diagram for detailed instructions.
4. For direct installation, place the pump on the base with an elevation of 30 to 40 mm (to be filled with cement grout), then perform alignment, place the anchor bolts, fill with cement grout, and after 3 to 5 days of cement drying, realign. Once the cement is completely dry, tighten the nuts of the anchor bolts.
5. When installing the pipes, both the inlet and outlet pipes must have their own supports to prevent the pump flange from bearing excessive weight from the pipes.
6. If the pump is used in suction applications, the inlet pipe must be equipped with a foot valve, and the inlet and outlet pipes should not have too many bends, and there should be no water or air leaks.
7. It is recommended to install a filter screen on the inlet pipe to prevent impurities from entering the impeller. The effective area of the filter screen should be 3 to 4 times the area of the inlet pipe to ensure free liquid circulation.
8. To facilitate maintenance and ensure safety, install a regulating valve on the pump's inlet and outlet pipes, and a pressure gauge near the pump outlet to ensure the pump operates within the rated range and to guarantee its normal operation and service life.
9. If an expansion connection is required at the inlet, use an eccentric reducer fitting.
8. To facilitate maintenance and safe and convenient use, install a regulating valve on the pump's inlet and outlet pipes, and a pressure gauge near the pump outlet to ensure the pump operates within the rated range, ensuring its normal operation and service life.
9. If an expansion connection is required at the inlet, use an eccentric reducer fitting.
DL type vertical multistage centrifugal pump: Start-up, operation, and shutdown
I. Start-up:
1. If the pump is used in suction applications (i.e., the inlet is under negative pressure), first fill the inlet pipe with water to purge the air or use a vacuum pump to extract the water, so that the water fills the entire pump and inlet pipe. Note that the inlet pipe must be sealed and there should be no air leaks.
2. Close the gate valve and the pressure gauge valve on the outlet pipe to reduce the starting current.
3. Manually rotate the rotor several times to lubricate the bearings and check if the impeller and the pump sealing ring rotate without friction. If it does not rotate, do not start until the cause of the failure is found.
4. Attempt to start. The motor rotation direction must match the pump arrow direction. Open the pressure gauge valve.
5. When the rotor reaches normal operating speed and the pressure gauge shows pressure, gradually open the outlet gate valve until the desired operating conditions are reached.
II. Operation:
1. During pump operation, pay attention to instrument readings and make the pump operate as close as possible to the flow rate and lift height specified on the nameplate. Avoid high flow operation.
2. Periodically check that the motor current value does not exceed the rated current.
3. The temperature of the pump bearings should not exceed 75 ℃ and should not exceed the ambient temperature by more than 35 ℃.
4. When starting the pump operation, loosen the packing pressure cover. Once the expanded graphite or packing is fully expanded, adjust it to the appropriate level.
5. Excessively worn parts should be replaced in time.
6. If any abnormalities are observed, stop the machine immediately and investigate the cause.
III. Shutdown:
1. Close the outlet pipe gate valve and the vacuum gauge valve.
2. Stop the motor and then close the pressure gauge valve.
3. In case of winter freezing, drain the liquid from the pump to prevent cracking due to freezing.
4. If the pump will not be used for an extended period, disassemble it, clean it, lubricate it, and store it properly.
Tip: To consult the performance parameters of the DL type vertical multistage centrifugal pump, click →【Pump Selection】
温馨提示：DL型立式多级离心泵的性能参数，请点击→【水泵选型】页面查询
Why Choose Us?
Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.
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Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。
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