1. The PBG shielded pump can ensure complete non leakage and transport liquids that are harmful to human health, the environment, and equipment, as well as expensive and prone to leakage.
2. Not capable of inhaling air, suitable for vacuum systems and conveying liquids that deteriorate upon contact with air.
3. The oil-free design can reliably transport liquids with high temperature, high pressure, low temperature, and large temperature and pressure changes that are difficult for general pumps to transport.
4. Bearings use self selected lubrication of the conveying liquid, without the need for lubricating oil, so they do not contaminate the conveying liquid and eliminate the trouble of regular oil injection.
5. The pump structure is reasonable, with the motor and pump coaxial, small size, light weight, small footprint, smooth operation, easy installation, no need for adjustment, and convenient maintenance.
6. The impeller adopts an advanced hydraulic model, which has the characteristics of high efficiency and good performance.
7. The motor has no cooling fan, which reduces the noise and vibration during operation.
8. The specification design of the pump inlet and outlet flanges is the same as that of standard valves, and they are located on the same centerline with a low center, which facilitates pipeline layout. The pump room design is also more reasonable and practical.
9. The standardization and serialization of components are high.
10. The motor and junction box both adopt waterproof and explosion-proof structures, which can be safely used outdoors.
11. The series or parallel operation mode of the pump can be adjusted according to the requirements of flow rate and head.
12. The newly adopted graphite bearings have the advantages of high wear resistance, low friction coefficient, anti-aging, and resistance to sediment and sand.
13. The top of the motor is equipped with an automatic exhaust valve. When the water pump is in use, simply open the water valve and release the air nozzle next to the exhaust valve. The air inside the pump body and motor will be automatically discharged from the automatic exhaust valve on the top of the motor. After exhaust, it will automatically close immediately, preventing the medium from flowing out of the pump, ensuring the normal operation of the water pump. In addition, if air enters the pipeline during use, it can automatically discharge it. This function eliminates the need for a dedicated person to frequently open the valve for exhaust during pump use, greatly reducing the cost and manpower of normal use.
14. The unique detachable structure allows the pump to be easily maintained during normal use, such as removing scale and checking the wear of graphite bearings. Simply remove the connecting screws on the motor housing and the lower end cover of the motor, and push out the motor and stator components through the screw holes on the motor housing. Therefore, maintenance and regular inspections are extremely convenient.
15. Full protection electrical control box: This item is an optional accessory, which, together with the pre embedded thermal protector, water shortage probe, and water leakage probe in the motor, can provide comprehensive protection for shielding the motor. 1、 Overheating protection, the motor will automatically stop when the temperature exceeds the set value; 2. Water shortage protection, the motor cannot be started when the circulating water of the motor is short of water. If there is a lack of water inside during operation, the motor will stop, and sometimes it will automatically start again; 3. Water leakage protection, when water leaks into the motor, the power will be immediately cut off and the motor will be stopped; 4. Leakage protection, when there is a leakage situation, the power will be immediately cut off and the motor will be stopped.

Product Overview

The PBG series fully leak free shielded vertical centrifugal pump is a new generation shielded pump product introduced by our company, which has absorbed advanced technology from international shielded pump design and manufacturing. After digestion and innovation by our technical personnel, this product improves electromagnetic core technology, enhances fluid motion state, improves pump efficiency, and takes comprehensive performance indicators to a higher level. The product is also more ideal.
PBG shielded pump is a pump product with an integrated structure of electric motor and water pump. It has advanced technology, high reliability, no shaft seal, and achieves complete leak free performance; Due to its low motor noise, low fault rate of shielded pumps, safety and environmental protection, and low maintenance costs, it has won the favor of a large number of users and also enhanced the demand for high-quality water pumps in the Chinese market.
The product is widely used in petrochemical, chemical industry, medicine, textile, nuclear power, military industry, shipbuilding and urban water supply and drainage, fire boosting, high-rise building boosting water supply, garden sprinkler irrigation, HVAC refrigeration and other cold and warm water circulation boosting. Especially for places with high requirements for vibration and noise, such as key projects, pump rooms, central air conditioning, and research institutions and hospitals. It can also be used to transport liquids that do not crystallize or solidify under pressure and temperature. Liquids or valuable liquids that are particularly harmful and unsafe to human health and the environment.

performance parameters

meet the standard
The PBG shielded pump basically complies with the provisions of international standard ISO02858, national standard GB5662.85, JB/T6878.2-93, and JB6216-92.
main purpose
1. PBG and PBGD shielded pumps are used for conveying clean water and other liquids with physical and chemical properties similar to clean water, suitable for medium temperatures ranging from -30 ℃ to+90 ℃ Specially suitable for industrial and urban water supply and drainage, fire boosting, high-rise building boosting water supply, garden sprinkler irrigation, distance transportation, HVAC refrigeration cycle, bathroom and other cold and warm water circulation boosting and equipment matching.
2. The PBGR hot water shielded pump is suitable for conveying medium temperatures ranging from -30 ℃ to+160 ℃ in high temperature situations Mainly suitable for energy, metallurgy, chemical, textile, papermaking, hotels, restaurants, bathrooms and other departments.
3. PBGH anti-corrosion shielded pump is used for conveying solid particles free materials and is suitable for departments such as petrochemicals, chemical engineering, metallurgy, power, papermaking, food, pharmaceuticals, scientific research institutions, and synthetic fibers.
4. PBGN reverse circulation shielding is used for transporting liquefied gas and easily vaporized media.

working conditions
1. The medium must be a fluid that is soft water, thin, non solidifying, non flammable, and free of solid particles and fibers.
2. The medium temperature of PBG pump shall not exceed 90 ℃, and the medium temperature of PBGR pump shall not exceed 120 ℃
3. In general, the working pressure of the system should not exceed 1.2MPa. The inlet pressure should not be less than 0.05MPa. In special circumstances, please contact our company in advance.
4. The maximum pressure of PBG shielded pump system is 1.6MPa, which means that the suction pressure of the water pump plus the pump head is ≤ 1.6MPa
Material (Material design can also be customized according to user requirements, special configurations)

serial number Part Name cold and hot water Corrosive fluid 1 pump body Ht200,Zg25 ICr18Ni9Ti 2 Upper cover 3Cr13,Ht200,Zg25 ICr18Ni9Ti 3 impeller Ht200,Zg25 ICr18Ni9Ti 4 Lower end cover 3Cr13,Ht200,Zg25 ICr18Ni9Ti 5 motor housing Ht200,Zg25 ICr18Ni9Ti 6 Shielding cover, shielding pressure plate 0Cr17Ni4Mo2 oCr19Ni11 7 bearing Graphite impregnated furan resin Graphite impregnated furan resin 8 Shaft sleeve, thrust disc ICr18Ni9Ti+nickel based alloy, etc ICr18Ni9Ti, 0Cr17rNi4m, and other nickel based alloys, as well as those produced by Ketali alloy casting 9 Other liquid receiving parts Ht200,OCr17Ni4Mo2 ICr18Ni9Ti 10 Non liquid contact part Ht200,20 Ht200,20

Structural Description
The structure of PBG shielded pump is shown in the figure. This pump, also known as an electric pump, is a machine pump integrated structure. The whole machine mainly consists of pump body, impeller, connecting body, sliding bearing, stator, rotor, shielding sleeve, motor housing and other components. The pump is a vertical single-stage single suction centrifugal type, with the inlet and outlet on the same horizontal axis and the same inlet and outlet diameter specifications. It can be directly installed on any part of the pipeline like a valve, making installation extremely convenient and occupying less space. The pump is integrated with the motor through a connecting body, and the bearings are made of imported graphite impregnated resin composite bearings. The motor stator and rotor are each enclosed and isolated with shielding sleeves. The bearing adopts the pumped liquid itself as lubricant and coolant, which has the characteristics of reasonable design and feasible operation. The pump is equipped with a base, which can be directly installed on the foundation, or it can be installed with a connecting plate and an isolator or isolation pad.
The top of the pump is equipped with an automatic exhaust valve, which can automatically remove air without leaking the medium. The outlet of the pump is connected to the upper cover plate of the motor through a circulation pipe. After the pump is started, a portion of the medium can enter the motor part through the circulation pipe while conveying the medium, and then flow back to the inlet to cool the motor and lubricate the bearings. The unique detachable structure allows the pump to be easily maintained during normal use, such as removing scale and checking the wear of graphite bearings. Simply remove the adapter screws on the motor housing and the lower end cover of the motor, and push out the motor and stator components through the screw holes on the motor housing. Therefore, maintenance and regular inspections are extremely convenient. Please refer to the installation diagram below for details.

Installation Instructions
1. Before installation, check whether the fasteners of the unit are loose and whether there are foreign objects blocking the flow channel of the pump body to avoid damaging the impeller and pump body during the operation of the electric pump.
2. The weight of the pipeline should not be added to the water pump during installation, and there should be separate supporting bodies to avoid affecting the operating performance and service life when the pump deforms.
3. In order to prevent impurities from entering the pump and blocking the flow channel, a filter with a cross-sectional area 3-4 times larger than the suction pipe should be installed before the pump inlet.
4. When a pump is used to transport hot water or other high-temperature liquids, in order to prevent the pump from being subjected to thermal deformation of the pipeline, the pump may not be fixed with foot bolts. When the pipeline system expands and contracts due to heat, the pump and pipeline can move simultaneously.
5. For the convenience and safety of maintenance and use, a regulating valve should be installed at each inlet and outlet pipeline of the pump, and a pressure gauge should be installed near each inlet and outlet of the pump to ensure that the pump operates within the rated range and ensures its normal operation and service life.
Starting, running, and stopping
（1） Start up and operation:
1. Inject water and exhaust, open the inlet valve, release the air nozzle cover on the automatic exhaust valve to allow the liquid to fully enter the pump chamber. The automatic exhaust valve on the top of the water pump motor will automatically exhaust the air inside the motor, and then close automatically.
2. Close the outlet valve of the pipeline to reduce the starting current.
3. Check if all parts are normal.
4. Connect the power and start to determine the correct direction of operation.
5. Gradually adjust the opening of the outlet valve to ensure that the pump operates within the rated performance range as much as possible.
6. If there is any abnormality during the operation of the pump, it should be stopped immediately for inspection and troubleshooting.
7. Check if the motor current value and temperature rise meet the required range.
（2） Parking
1. Close the valve of the pump output pipeline.
2. Cut off the power and stop the motor from running.
3. Close the inlet valve.
4. If the pump is not used for a long time, the liquid inside the electric pump should be drained completely.
maintenance and upkeep
（1） Preparation and inspection before starting
1. Check whether the grounding device of the shielded motor and starting equipment is good and complete, whether the wiring is correct, and whether the contact is reliable.
2. For newly installed and long-term credit shielded motors, the insulation resistance of the motor stator winding to ground should be checked before use.
3. It is necessary to regularly inspect the exhaust valve of the electric pump to ensure that it can work properly. When there is gas trapped in the pump, it can automatically drain it, so that the electric pump can be truly filled with pumped liquid
（2） Maintenance and upkeep during operation
1. Regularly record changes in power supply voltage and voltage imbalance. Excessive or insufficient power supply voltage, as well as unbalanced three-phase voltage resulting in current imbalance, can cause motor overheating or other abnormal phenomena, leading to damage.
2. Regularly record the load current and imbalance of the electric pump. When an electric pump malfunctions, it mostly reflects a sharp increase in the current of the stator winding, causing the motor to overheat.
3. Regularly record the temperature of the wheel fluid in the pipeline to ensure that the actual infusion temperature is lower than or equal to the specified infusion temperature, and to avoid the electric pump running in an over temperature state for a long time, which may reduce the service life of the motor.
4. Regularly record the pressure gauge values at the inlet and outlet ends of the electric pump. The pressure gauge value at the inlet must not be less than zero. The difference between the pressure gauge values at the outlet and the inlet must comply with the specified pressure values.
5. Before each use, the electric pump should check whether the automatic exhaust valve on the top of the motor is intact and whether the air nozzle cover is loose to ensure that it meets the requirements of automatic exhaust. Due to the long-term operation of the pump, water molecules are stirred and impacted at high speed inside the electric pump. At the same time, the medium being transported has a certain temperature, so the liquid will produce gasification phenomenon, causing the graphite bearing to be in a dehydrated state, that is, dry friction. Dry friction is extremely easy to damage the bearing and reduce its service life.
6. Pay attention to the odor, vibration, and noise of the electric pump. The winding of the motor will produce a burnt smell of insulation due to high temperature. Typical mechanical failures may manifest as vibration and noise. Therefore, it was found that the abnormality was caused by an immediate power outage for inspection.
7. Regularly check the circulating fluid path of the electric pump and whether there is any blockage in the filtering device to prevent scale and rust on the filter screen.
8. Measure the gap between graphite bearings and bearings during regular maintenance to ensure even clearance and reliable operation between the stator shielding sleeve and rotor shielding sleeve. In general, the following table is limited. If it exceeds the specifications in the table, it should be repaired and replaced.

Outer diameter of shaft sleeve (mm) Wear limit clearance (mm) Standard maximum gap (mm) >18-30 0.40 0.131 >30-50 0.45 0.158 >50-80 0.50 0.192

9. Regularly check the clearance between the impeller mouth ring and the pump body, as the clearance will directly affect the performance of the electric pump. If the clearance is too large, replace the impeller in a timely manner.
Installation method
Not only is installation extremely convenient, but it also occupies a small area, has a beautiful and elegant appearance, low noise, low vibration, high efficiency, and can be used in conjunction with vibration isolators.

Fault phenomenon Possible causes exclusion method 1. The water pump is not producing water 1. The import and export valves are not open, the inlet and outlet pipelines are blocked, and the impeller flow channel is blocked 2. The direction of motor rotation is not correct, and the motor speed is very slow due to phase loss. 3. Leakage of suction pipe 4. There is air inside the electric pump chamber 5. Insufficient imported water supply 6. Excessive pipeline resistance and improper pump selection 1. Check and remove blockages 2. Adjust the motor direction and check the motor wiring 3. Tighten all sealing surfaces and eliminate air 4. Open the exhaust valve on the top of the motor and exhaust all the air 5. Shutdown inspection and adjustment 6. Reduce pipeline bends and reselect pumps 2. Insufficient water pump flow 1. Check according to the above reasons first 2. Partial blockage of pipeline and pump impeller, deposition of scale, and insufficient valve opening 3. Low voltage, slow speed 4. Wear of impeller mouth ring and excessive leakage 1. First, exclude according to the above 2. Remove the obstruction and re open the valve 3. Voltage stabilization 4. Replace the impeller 3. Excessive power 1. Exceeding the rated flow usage 2. Impeller or rotating components are rubbing against each other 3. Wear or rupture of sliding bearings 4. Excessive medium density 1. Adjust the outlet valve to reduce the flow rate 2. Check, eliminate or replace components 3. Replace the sliding bearing 4. Modification 4. Noise vibration 1. Unstable pipeline support 2. Medium mixed with gas 3. Generating cavitation phenomenon 4. Friction between rotating parts 1. Stable pipeline 2. Increase suction pressure and exhaust pressure 3、 降低真空度 4. Check, adjust or replace 5. Motor overheating 1. Excessive traffic and overloaded operation 2. The stator and rotor are rubbing against each other 3. Insufficient voltage 4. Blockage of cooling system pipeline 1. Adjust the outlet valve to reduce the flow rate 2. Check and exclude 3. Voltage stabilization 4. Clear the blockage and clean the filter screen at the outlet of the water pump 6. The outlet valve does not release water 1. Export pipeline with air 2. There is no pressure on the export 1. Remove air from the pipeline 2. To supply water to the pipeline, a certain pressure is required

Precautions
1. For shielded pipeline pumps that have been out of use for a long time, in addition to checking according to the regulations on page 19, it is also necessary to check whether there is scaling in the shielded motor and whether the rotation is flexible.
2. When pumping non soft water, it is necessary to regularly remove the scale, usually once every three months; When pumping hot water, once a month.
3. Generally, the motor should be disassembled and inspected once a year to check the wear and tear of vulnerable parts, and replaced if necessary.
4. The maintenance of shielded motors must be carried out by professionals; Please contact our company if you have any difficulties
5. In northern regions, special attention should be paid to antifreeze in winter. Before starting up, it is necessary to check the drainage valve to avoid unnecessary losses.

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