Lightweight stainless steel vertical multi-stage centrifugal pump QDLF series

Lightweight stainless steel vertical multi-stage centrifugal pump QDLF seriesproduct：

Lightweight stainless steel vertical multi-stage centrifugal pump QDLF seriesProduct Introduction:

QDLFVertical stainless steel multi-stage centrifugal pumpIt is based on our company's ISG type verticalcentrifugal pumpAnd DL type vertical multi-stagecentrifugal pumpDesigned for its advantages. The structure adopts a vertical and segmented form, with the suction and discharge ports of the pump designed in a straight line below, and a hydraulic model is used. The axial force of the pump is solved by hydraulic balance method, and the residual axial force is borne by a ball bearing, thus ensuring smooth operation, low noise, small footprint, and convenient decoration. Vertical stainless steel multi-stagecentrifugal pumpThe outer cylinder is made of stainless steel, which has a beautiful appearance and is particularly suitable for parallel use of multiple pumps in high-rise buildings to reduce the power of a single pump unit and simplify electrical control equipment. Suitable for fire protection, domestic water supply, air conditioning unit circulation, cooling water transportation, etc. in residential buildings, hospitals, hotels, department stores, office buildings, and other high-rise buildings.

Model meaning:

Performance parameters:

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Installation of:

1Lightweight centrifugal pumpIt should be installed vertically on the ground,. Ensure sufficient cold air enters the motor cooling fan during installation. The bottom arrow of the pump indicates the direction of flow through the pump.
2. To minimize the possible noise generated by the pump, anti vibration fasteners are installed on both sides of the pump and between the foundation and the pump body. The docking flange, gasket, bolt, and PJE joint are provided as accessories and must be ordered separately. If necessary, when cleaning, repairing, or replacing the pump, isolation valves should be installed on both sides of the pump to prevent system drainage. The installation pipeline of multi-stage centrifugal pumps should avoid air blockage, especially on the suction side of the pump. The pipe should be installed in such a way that any stretching caused by temperature changes will not affect the pump. If the pump is installed on a long pipe, it should be properly supported both in front and behind as shown.
3. If there is a risk of blockage by stones, leaves, small support bars, etc. in multi-stage centrifugal pumps, measures should be taken to prevent such incidents from happening. Install a filter screen on the straw area.
4. In some installation situations, if the drainage pipe is already installed horizontally or tilted downwards by the pump, the water inside the pump will or will inevitably flow out at intervals, and the pump should be protected from causing the impeller to idle. Installing a faulty pipe with a vacuum valve near the pump can avoid this situation. The highest point of the ring pipe should be at least level with the connecting plate of the pump's motor. This way, the drainage pipe can independently drain water from the pump, and vice versa.
5. When the drain valve is closed, the pump is prohibited from running because it can cause an increase in temperature/vapor formation inside the pump, leading to pump damage. If there is any danger to the operation of the pump when the drainage room is closed, connect a bypass or drain pipe to the outlet to ensure that the smallest amount of liquid flows through the pump. A drain pipe, for example, can be connected to a water tank.
6、QDL、QDLFlightweightcentrifugal pumpThe smallest amount.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】For example:

An example of a typical high-pressure flushing system diagram. Haitan Pump Industry recommends this installation method as shown in the picture, which is used in situations where the "minimum flow rate" cannot be guaranteed to pass through the pump.
1. The liquid flow switch of the lightweight centrifugal pump will provide protection for the pump, preventing it from being damaged due to high heat generated during operation when the liquid flow is too small.
2. The filter screen of a lightweight centrifugal pump is installed to protect the flow switch in devices used for transporting slightly polluted water.
Note: In devices with stable liquid flow and the ability to ensure minimal flow, the above measures are not necessary. In devices with water hammer hazards, a check valve must be installed at the outlet of the pump. Do not use quick closing valves, such as quick closing spray guns, as they can cause water hammer. Affects the connection between the motor and the pump shaft, and in severe cases can cause the pump shaft to break.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Electrical connection:

1. Lighttypecentrifugal pumpBefore opening the junction box cover and removing the components of the pump, be sure to turn off the power. Electrical connections must be made by qualified electricians in accordance with local regulations. The motor junction box must be correctly connected to the power switch with wires. The operating voltage and frequency are marked on the nameplate. Please note that the power source used should be suitable for the electric motor. The three-phase motor must be connected to a starter with a protective function.
2. The junction box of the lightweight centrifugal pump can be rotated 90 ° and stopped at four positions in sequence. When needed, use a screwdriver to remove the coupling guard plate, but do not remove the coupling. Unscrew the bolts that secure the motor to the pump. Rotate the motor to the desired position. Tighten the bolts again. Reinstall the coupling guard plate so that it is vertically aligned in the recess of the pump head. Electrical connections should be made according to the wiring diagram inside the junction box cover.
Note: In lighttypecentrifugal pumpDo not start the pump until it is filled with liquid.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Startup instructions:

1、 Closed or open systems where the liquid level is higher than the pump inlet:
a、 Close the drainage isolation valve and loosen the exhaust screw on the pump head.
b、 Please pay attention to the direction of the exhaust port and ensure that the water flowing out does not cause harm to people or damage to the motor or other components. In hot water systems, special attention should be paid to the risk of burns caused by hot water.
c、 Slowly open the isolation valve on the suction pipe until a steady stream of liquid flows out of the exhaust valve.
d、 lighttypecentrifugal pumpTighten the exhaust screw and open the isolation valve * when starting.

2、 Liquid level below pump inlet open system:
a、 The suction pipe and pump must be filled with liquid and vented before starting the pump.
b、QDL2、4（QDLF2、4、8、16）
c、 Close the drainage isolation valve. Rotate the bypass valve slightly towards the stop as shown in Figure 7.
d、 Remove the infusion plug and inject liquid from the infusion port until the suction pipe and pump are filled with liquid, then tighten the bypass valve again.
e、Lightweight centrifugal pumpReplace the infusion plug when starting and tighten it firmly.

IIILightweight centrifugal pumpCheck the direction of rotation during startup:
a、 atLightweight centrifugal pumpDo not start the pump to check the direction of rotation until it is filled with liquid.
b、 When checking the direction of motor operation, the coupling should not be disassembled for inspection. Because when the coupling is removed, the position of the shaft needs to be adjusted. The correct direction of rotation is indicated by the arrow on the pump head or on the motor fan cover. Looking at the fan,Lightweight centrifugal pumpIt should be rotated counterclockwise.

4、 Starting of lightweight stainless steel multi-stage centrifugal pump:
a、 Before starting the lightweight centrifugal pump, it is necessary to open the isolation valve on the suction side of the pump and keep the isolation valve on the discharge side almost closed.
b、Lightweight centrifugal pumpWhen starting, loosen the exhaust screw on the pump head to allow the pump to exhaust until a steady stream of liquid flows out from the exhaust hole, and then tighten the exhaust screw.
Attention: The direction of the exhaust hole should be ensured that the liquid flowing out will not cause harm to people or damage to the motor or other components. In hot water systems, special attention should be paid to the risk of burns caused by hot water. When the pipeline system is filled with liquid, slowly open the isolation valve until it opens. When pumping liquid containing air, regularly exhaust the pump. To exhaust the pump, loosen the exhaust screw on the pump head during operation.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Maintenance, starting and stopping frequency:

Lightweight centrifugal pumpMaintenance of:
1. Before starting the multi-stage centrifugal pump, it is necessary to verify that there is no power supply to the pump and that the pump cannot suddenly start.
2Lightweight centrifugal pumpThe bearings and shaft seals do not require maintenance. If the pump is not in use for a long time and needs to be drained, one of the coupling guard plates can be removed, and a few drops of silicone oil can be injected into the shaft between the pump head and the coupling. This can prevent the shaft sealing surface from sticking.
3. When installing the coupling guard, be sure that they are vertically aligned in the recess of the pump head.

Lightweight centrifugal pumpElectric motor bearings:
5. Electric motors without lubrication nozzles do not require maintenance. Electric motors equipped with lubrication nozzles should be lubricated with high-temperature lithium based grease.
6. If the pump is temporarily suspended for a long time, it is recommended to clean and lubricate the pump and motor once it is no longer in use.
7. During frost, if the pump is not in use, the water should be drained to prevent damage and cracking. Loosen the exhaust screw on the pump head and remove the drain plug on the base to drain the pump. After the water is drained, the removed components should be reinstalled or properly stored.

Lightweight centrifugal pumpStart and stop frequency:
The starting frequency of motors with a power of less than 4KW for multi-stage centrifugal pumps shall not exceed 100 times per hour. The starting frequency of other motors shall not exceed 20 times per hour.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Product features:

1. By adopting excellent hydraulic models and advanced manufacturing processes, the performance and service life of the pump are greatly improved.
2. Due to the use of mechanical seals made of hard alloy and fluororubber, the reliability of pump operation and the temperature of the conveying medium can be improved.
3. The overcurrent part of the pump is made of stainless steel plate stamped and welded, making the pump suitable for mildly corrosive media.
4. The overall structure is compact, small in size, light in weight, low in noise, energy-saving, and easy to maintain.
5. The inlet and outlet of the pump are located on the same horizontal line as the pump seat and can be directly used in the pipeline.
6. Using standard motors, users can easily equip motors according to their needs.
7. Intelligent protectors can be equipped according to user needs to effectively protect pumps from dry running, phase loss, overload, etc.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Usage conditions:

1. Medium temperature: -15 ℃~+120 ℃.
2. The maximum ambient temperature is+40 ℃.
3. The maximum ambient pressure is 10 bar.
4. The maximum import pressure is limited by the maximum environmental pressure.
5. When the density or viscosity of the conveying medium is greater than that of water, it is necessary to consider using a high-power motor.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Transport medium:

1. A non flammable and explosive medium that is thin, clean, and free of solid particles or fibers.
2. Such as mineral water, softened water, pure water, clear oil, and other light chemical media.
3. The main material of the vertical stainless steel multi-stage centrifugal pump is stainless steel, which can be used to pump mildly corrosive media.

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Motor selection:

The motor is a fully enclosed, air-cooled two pole standard motor
Protection level: IP55
Insulation level: F
Standard voltage (50Hz): single-phase 220V, three-phase 220V/380V

QDLF seriesLightweight stainless steel vertical multi-stage centrifugal pump】Product Usage:

Water supply: filtration and transportation of water plants, water supply to different zones of water plants, main pipeline pressurization, and pressurization of high-rise buildings.
Industrial pressurization: process water system, cleaning system, high-pressure flushing system, fire protection system.
Industrial liquid transportation: cooling and air conditioning systems, boiler feedwater and condensing systems, machine tool matching, and transportation of acidic and alkaline media.
Water treatment: ultrafiltration system, reverse osmosis system, distillation system, separator, and water treatment system for swimming pools.
Irrigation: farmland irrigation, sprinkler irrigation, drip irrigation.