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BHP25~42 High Pressure Pump

The BHP25, BHP32, BHP42 series axial piston pump is designed to transport high-pressure, low-viscosity corrosive fluids. It is mainly used in applications such as high-pressure cleaning and high-pressure spraying. It is especially suitable for high-pressure transportation of high-purity water.

BHP25, BHP32, BHP42 series pumps are based on the principle of axial piston pumps, which use the volume change produced by the reciprocating movement of the piston parallel to the drive shaft in the piston hole to work. The BHP25, BHP32, BHP42 series axial piston pump uses the fluid itself to lubricate the moving parts of the pump, so there is no need to use lubricating oil.

The BHP25, BHP32, BHP42 series axial piston pump is a fixed displacement pump, and the flow rate is proportional to the speed of the input shaft and the displacement of the pump.
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Overview


The BHP25, BHP32, BHP42 High-Pressure water pumps are specifically designed for operation on technical water. The axial piston principle provides very high efficiency, small and compact design and long service life. The BHP25, BHP32, BHP42 high pressure pumps are water lubricated and do not involve any other lubricant making this unique pump maintenance free over its entire service life.


The BHP25, BHP32, BHP42 pumps are positive displacement pumps, with nine axial pistons that move a fixed amount of water in each cycle. Flow is proportional to the number of input shaft revolutions(rpm).  Unlike centrifugal pumps, they produce the same flow at a given speed independently of no matter what the discharge pressure.


Features and benefits


① Simple structure, small size, light weight, one of the smallest and lightest pumps on the market

② Low pressure fluctuation and high working pressure

③ Usually driven by an electric motor; if a special coupling is used, it can be driven by an internal combustion engine

④ No need for lubricating oil, long maintenance period, no preventive maintenance during the warranty period

⑤ The pressure pulse generated in the pressure pipeline is extremely small, the vibration is small, and the noise is low

⑥ All parts of the pump are made of 304 stainless steel, 316 stainless steel and 431 stainless steel

⑦ High efficiency, volumetric efficiency up to 95%.


Technical Data Sheet


Specification BHP25 BHP32 BHP42
Geometric displacement cm3/rpm 25 32 42
Maximum continuous working pressure bar 160 160 80
Peak pressure bar 180 180 100
Maximum speed rpm 1800 1800 1800
Minimum speed rpm 700 700 700
Flow (1500 rpm) L/Min 35 44 55
Working noise (1m distance) dB <78 <78 <78
Power (maximum working pressure) Kw 10.5 13.5 9
Weight Kg 16 16 16


Speed and Flow


If the required flow rate (m3/h) and speed (rpm) are known, it will be easy to select the most suitable pump by using the figure below.


speed-&-flow-for-BHP25-42-high-pressure-pump


Not only that, the graph also shows that the flow rate can vary with the speed of the pump. The flow/speed ratio is fixed, and the required flow can be obtained by changing the speed to the corresponding value.


Typical Pressure and Power


Pump Model Flow Pressure Rotating   Speed
L/min m³/h 60Bar 80Bar 160Bar rpm
BHP25 35 2.5 5.5KW 7.5KW 15KW 1800
BHP32 44 3.1 7.5KW 11KW 18.5KW 1800
BHP42 55 3.9 11KW 11KW ----- 1800


Inlet pressure


The BHP series axial piston pump can directly supply water from the feed water pump. The pressure of the axial piston pump inlet must be within the range of 0.5-5 Bar (0.05-0.5Mpa or 7.3-72.5psi).

Unit conversion relationship: 1.0Mpa=10Bar,1.0Mpa=145psi


Temperature and corrosion


Operation


Fluid temperature: +2°C ~ +50°C

Ambient temperature: +2°C ~ +50°C

All key components of BHP series axial piston pumps are made of 304 stainless steel, 316 stainless steel and 431 stainless steel.

The BHP series axial piston pump must not be used in sewage or other water containing particles.


Storage


Storage temperature: -40°C to +70°C (the pump has been emptied and sealed for storage).

Antifreeze is required when the temperature is lower than 2°C. We recommend using Dow Cal-N from DuPont Chemical Company or Chill safe Propylene Glycol from Ark man Chemical Company.


Noise


Please refer to "Technical Date Sheet" for specific noise values.


Under normal circumstances, the noise will be reduced when the speed is reduced, and vice versa. Flexible hoses can be used to minimize vibration and noise.


Since the axial piston pump (group) is usually installed on a bell-shaped cover or base, the noise level can only be determined by the entire system. Therefore, the correct use of shock absorbers to install the pump set on the base is extremely important to reduce vibration and noise.


The noise level is affected by the following factors:

The speed of the pump, high speed produces more noise than low speed.

The rigid installation of the pump generates more noise than the flexible installation.

Compared with the connection through a hose, the direct connection of the pipe to the pump will increase the noise.


Filtration requirements


Due to the very low viscosity of water, in order to control the internal leakage rate and improve the performance of the components, the clearance of the BHP series axial piston pump is designed to be very small. Therefore, proper filtration of inlet water is essential to minimize pump wear.


The main filter must have a filtration efficiency of 99.98% for particles above 10 µm. It is recommended to use a precision depth filter element with a rated accuracy of 10 µm (absolute accuracy) and ß10>5000 (equivalent to a filtration efficiency of 99.98%). Filter bags and wound filter elements usually only have a filtration efficiency of 90%, which means that for every 100,000 particles reaching the filter, there are 10,000 passing through, compared to only 20 passing through a filter with an efficiency of 99.98%.


Pump head dimensions and installation dimensions


install-pump-for-BHP25-42-high-pressure-pump


PUMP MODEL BHP25~BHP42
Flat key (mm) 10×8×27
Exhaust Plug 6mm inner hexagon
Inlet Interface G1,Depth 20mm
Outlet Interface G3/4,Depth 20mm


Outline and Installation Dimensions of Complete Equipment Including Motor


complete-install-for-BHP25-42-high-pressure-pump


Complete equipment without independent fan motor


Unit: mm

Model A B C D E F G H I1/I2 J K L IEC Motor
BHP25-42 337 267 216 12 335 132 754 140 G1 179 155 420 5.5KW, 4P
G3/4
337 267 216 12 335 132 799 140 G1 179 155 465 7.5KW, 4P
G3/4
417 324 254 15 415 160 888 210 G1 179 204 505 11KW, 4P
G3/4
417 324 254 15 415 160 933 254 G1 179 204 550 15KW, 4P
G3/4
459 368 279 15 455 180 978 241 G1 179 204 595 18.5KW, 4P
G3/4


Complete equipment with independent fan motor


Unit: mm

Model A B C D E F G H I1/I2 J K L IEC Motor
BHP25-42 337 267 216 12 335 132 799 140 G1 179 155 465 5.5KW, 4P
G3/4
337 267 216 12 335 132 839 140 G1 179 155 505 7.5KW, 4P
G3/4
417 324 254 15 415 160 933 210 G1 179 204 550 11KW, 4P
G3/4
417 324 254 15 415 160 993 254 G1 179 204 610 15KW, 4P
G3/4
459 368 279 15 455 180 1058 241 G1 179 204 675 18.5KW, 4P
G3/4


Install


Assembly


The figure below shows how the pump is connected to the motor.

A: Pump spindle

B: Flexible coupling

C: Bell cover

Note: There should be no axial or radial load on the pump shaft


Install Note for High Pressure Pump


Service


The meticulous design makes the BHP series of axial piston pumps long running time, low maintenance requirements, and reduces life cycle costs.


If the BHP series axial piston pump runs under the specified pre-filtration, pressure and speed conditions, we provide an 8000-hour maintenance-free warranty, but the maximum period from the date of production does not exceed 18 months.


In order to prevent the pump from being completely damaged, it is recommended that you inspect the pump at most 8000 hours, at which time any worn parts must be replaced.


Maintain


BHP series axial piston pump uses water as lubricant, so there is no oil in the pump.

The BHP series axial piston pump is not expected to be replaced during the initial 8000 hours of operation.










1. How to extend the service life of the pump, maintain its pumping stability, and avoid particle wear on the pump?


In order to prolong the service life of the pump and maintain its pumping stability, please make sure that the working conditions of the medium are consistent with the required working conditions. In order to avoid particle wear to the pump, we strongly recommend that you install an appropriate filter in front of the pump (the main filter must have a filtration efficiency of 99.98% for particles above 10μm).


2. How to avoid cavitation and dry rotation?


To avoid cavitation and dry running, it is recommended that you install a low-pressure protection switch before the pump inlet. Please refer to the parameter table in the technical specifications of the high-pressure pump for the minimum inlet pressure of different types of pumps.


3. What are the requirements for the Frequency converter?


Frequency converter requirements: If the pump needs to be equipped with a frequency converter, the frequency converter must be a heavy-duty constant torque, and the starting mode is constant torque starting. (Please pay attention to the selection of the frequency converter. The frequency converter for water pump fan is not constant torque, and may not be able to drive the positive displacement water pump. For example, the AC510 of ABB frequency converter cannot drive the BHP high pressure pump. The same is true for other brands of frequency converters. Please pay attention to the inverter manufacturer communicates and selects).


4. What do we need to pay attention to in the use of high-pressure pumps?


Please pay attention to the continuous inlet pressure, maximum peak inlet pressure, maximum continuous outlet pressure, and minimum outlet pressure operating ranges of different types of pumps; please ensure that the pressure during operation of the pump does not exceed the range required by the specification.


5. What to pay attention to when start and commission this series of high-pressure pumps?


Before starting the pump, it is recommended that you thoroughly flush the pipeline and system to remove any residues or foreign objects that may be present; and it is strongly recommended that you drain the air from the pump and the system.


Test whether the direction of the high-pressure pump is consistent with the arrow mark on the pump. "I" represents the inlet of the high-pressure pump, and "O" represents the outlet of the high-pressure pump.


6. Which operating environment BHP series axial piston pump is not suitable?


The BHP series axial piston pump must not be used in sewage or other water containing particles.


7. Under what circumstances does this series of pumps need to be stopped or overhauled?


If abnormal noise and vibration occur when the pump is running, please stop the piston pump immediately and perform maintenance on the piston pump.


8. How to use the high-pressure pump correctly?


It is forbidden to start the piston pump with the back-end valve closed, otherwise it may cause the safety valve to work, or even the pipeline burst.


9. Which connection method is used to connect the high-pressure hose?


It is recommended that the outlet of the BHP series axial piston pump adopt a flexible connection method of high-pressure hose.


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