RADIAL PISTON PUMP PR4-3X/3,15-700RA12M01

Manufacturer: Bosch Rexroth

Material #: R901094072

Model : PR4-3X/3,15-700RA12M01

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth PR4-3X/315-700RA12M01 (R901094072) is a high-performance radial piston pump designed for industrial applications requiring a reliable hydraulic power source. This robust pump features a cast iron housing that ensures durability and long-term operation under demanding conditions. With its constant displacement design, it provides consistent fluid flow, making it suitable for applications with open control loops. The PR4-3X/315-700RA12M01 pump operates at a maximum pressure of 315 bar and offers a maximum flow rate tailored to specific industrial needs. It is equipped with NBR seals which are compatible with standard HLP hydraulic fluids, ensuring effective sealing and protection against fluid leakage. This model boasts an impressive size range, allowing for precise matching to system requirements. Its minimum and maximum speeds are designed to accommodate various operational demands, maintaining efficiency and performance across different settings. The pump's direction of rotation is clockwise when viewed from the shaft end, which is standard for many systems. One of the standout features of this Bosch Rexroth pump is its self-priming capability, which simplifies the initial operation and maintenance procedures. The valve-controlled mechanism ensures that the pump elements work efficiently to deliver hydraulic power as needed. The PR4-3X/315-700RA12M01 does not include a through-drive option, indicating that it's intended for standalone use or as part of a more complex system without the need for additional pump mounting. The weight specification reflects its sturdy construction while still being manageable for installation. Overall, this radial piston pump exemplifies Bosch Rexroth's commitment to engineering excellence, providing reliable and efficient performance in various industrial hydraulic systems without compromising on quality or service life.

$3,820.00 USD

More are expected on October 21, 2024

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Status: This product is temporarily out of stock.

Qty: Delivered as early as October 21, 2024 when ordered in

This product is eligible for factory repair.

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RADIAL PISTON PUMP PR4-3X/3,15-700RA12M01

Radial piston pump, size 3.15 cm3, pressure 700 bar for industrial applications, open circuit

5-piston pump

Unpacked Weight: 11.2 kg

Fixed displacement Self-priming, valve-controlled Long service life due to hydro-dynamically lubricated plain bearings Several pressure ports with different cylinder combinations 14 sizes, favorable grading for perfect device design

Assembly

The pumps are valve-controlled, self-priming radial piston pumps with fixed displacement.

They consist essentially of the housing (1), eccentric shaft (2) and 3, 5 or 10 pump elements (3), with suction valve (4), pressure valve (5) and piston (6).

Suction and displacement procedure

The pistons (6) are arranged radially to the eccentric shaft (2). The hollow piston (6) with the suction valve (4) is guided in a cylinder (7) and pressed onto the eccentric (2) by the spring (8). The radius of the piston running surface corresponds to the eccentric radius. The cylinder (7) provides sealing against a hemispherical element (9).

In downward movements of the piston (6), the working space (10) in the cylinder (7) is enlarged. Due to the resulting negative overpressure, the suction valve plate is raised from the sealing lip. Simultaneously, the connection from the suction chamber (12) to the working chamber (10) is realized by means of a radial groove (11) in the eccentric (2).

The working chamber is filled with fluid. In upward movements of the piston (6), the suction valve (4) is closed and the pressure valve (5) is opened. The fluid now flows to the system via the pressure port (P).

Fixed displacement Size 1.60 … 20.00 Maximum operating pressure 700 bar

Data Sheet	Download Data Sheet
3D CAD	Download 3D CAD

Max. pressure	700
Shaft end	Cylindrical Ø 25 mm with fitting key, ISO 3019-2
Size	3.15
Speed min.	1000
Productgroup ID	9,10,11,12,13,14
Speed max.	2000
Fastening	4-hole fastening centering 63 mm
Max. flow	4.5
Displacement type	constant
Direction of rotation	clockwise rotation
Connection diagram	1
Through-drive	without
Weight	11.2
Seals	NBR
Hydraulic fluid	HLP

01		02		03	04	05	06	07	08	09
PR4	–	3X	/		R					*

Type
01	Radial piston pump, fixed displacement, maximum pressure 700 bar			PR4
Component series
02	Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions)			3X
Size		NG	Pressure rating
03	Size – pressure stage (maximum)	1,60	700 bar	1,60-700
		2,00	700 bar	2,00-700
		2,50	700 bar	2,50-700
		3,15	700 bar	3,15-700
		4,00	700 bar	4,00-700
		6,30	700 bar	6,30-700 1)
		8,00	700 bar	8,00-700 1)
		3,15	500 bar	3,15-500
		5,00	500 bar	5,00-500
		6,30	500 bar	6,30-500
		8,00	500 bar	8,00-500
		10,00	500 bar	10,00-500
		16,00	500 bar	16,00-500 1)
		20,00	500 bar	20,00-500 2)
Direction of rotation
04	Viewed on drive shaft	clockwise		R
Drive shaft
05	Parallel keyed shaft			A
	Splined shaft 21 x 24, DIN 5481			G
	Cylindrical shaft with output for mounting an AZPF or AZPFF			K
Line connection
06	Pipe thread according to ISO 228/1			01
	SAE thread to ANSI B1.1			12
Seal material
07	NBR seals			M
	FKM seals			V
Pressure ports
08	1 Pressure port			01
	2 Pressure ports			02
	3 Pressure ports			03
	5 Pressure ports			08
	6 Pressure ports			11
	10 Pressure ports			12
Additional details
09	Further details in the plain text			*

1)	Not available with shaft versions "G" and "K"
2)	Not available with shaft versions "K"

Design options with multi-circuit pumps The following can be seen from the following schematic representations: the number and position of the pressure ports which cylinders are combined. Points mark the cylinders which are directly located at the pressurized pressure port. Circles mark the cylinders which are not directly located at the pressurized pressure port. The dashed and/or dot and dash lines show which cylinders are in each case combined. The pressurized pressure ports are designated in clockwise direction. The pressure port that - in clockwise direction - is closest to the suction port is referred to as P1 .
Type code (Pos. 08)	Number of pressure ports	Combination of cylinders
Type code (Pos. 08)	Number of pressure ports	3 pistons	5 pistons	10 pistons
01	1
02	2
03	3
08	5
11	6
12	10

01	02		03		04	05	06	07	08	09		10	11
	R4	–	3X	/		R	K		M		+		*

Pump combinations
01	2-fold			P2
	3-fold			P3
Type
02	Radial piston pumps, fixed displacement			R4
Component series
03	Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions)			3X
Size		NG	Pressure rating
04	Size – pressure stage (maximum)	1,60	700 bar	1,60-700
		2,00	700 bar	2,00-700
		2,50	700 bar	2,50-700
		3,15	700 bar	3,15-700
		4,00	700 bar	4,00-700
		3,15	500 bar	3,15-500
		5,00	500 bar	5,00-500
		6,30	500 bar	6,30-500
		8,00	500 bar	8,00-500
		10,00	500 bar	10,00-500
Direction of rotation
05	Viewed on drive shaft	clockwise		R
Drive shaft
06	Cylindrical shaft with output for mounting an AZPF or AZPFF			K
Line connection
07	Pipe thread according to ISO 228/1			01
	SAE thread to ANSI B1.1			12
Seal material
08	NBR seals			M
Pressure ports
09	1 Pressure port			01
	2 Pressure ports			02
	3 Pressure ports			03
	5 Pressure ports			08
Combination pumps
10	2-fold	NG
		4 cm3		AZPF4
		5 cm3		AZPF5
		8 cm3		AZPF8
		11 cm3		AZPF11
		14 cm3		AZPF14
		16 cm3		AZPF16
		19 cm3		AZPF19
		22 cm3		AZPF22
		25 cm3		AZPF25
		28 cm3		AZPF28
	3-fold	NG
		5 cm3 - 4 cm3		AZPFF5-4
		8 cm3 - 4 cm3		AZPFF8-4
		8 cm3 - 8 cm3		AZPFF8-8
		11 cm3 - 4 cm3		AZPFF11-4
		11 cm3 - 5 cm3		AZPFF11-5
		11 cm3 - 8 cm3		AZPFF11-8
		16 cm3 - 8 cm3		AZPFF16-8
		16 cm3 - 16 cm3		AZPFF16-16
Additional details
11	Further details in the plain text			*

1)	Project planning information for multiple pumps has to be observed

Size						1,60	2,00	2,50	3,15	4,00	6,30	8,00	3,15	5,00	6,30	8,00	10,00	16,00	20,00
Displacement	geometric			Vg	cm³	1.51	2.14	2.59	3.57	4.32	7.14	8.63	3.39	4.82	5.83	8.03	9.71	16.07	19.43
Drive speed				nmin	rpm	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000
Drive speed				nmax	rpm	2000	2000	2000	2000	2000	2000	2000	2000	2000	2000	2000	2000	2000	2000
Operating pressure	absolute	Inlet		p	bar	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5	0.8 ... 2.5
Operating pressure	absolute	Outlet	continuous	pN	bar	700	700	700	700	700	700	700	500	500	500	500	500	500	500
Inner diameter of the cylinders				Ø	mm	10	10	10	10	10	10	10	15	15	15	15	15	15	15
Torque	max.	Drive shaft			Nm	160	160	160	160	160	160	160	160	160	160	160	160	160	160
Number of cylinders						3	3	3	5	5	10	10	3	3	3	5	5	10	10
Weight				m	kg	9.2	9.2	9.2	12.4	12.4	16.4	16.4	9.2	9.2	9.2	12.4	12.4	16.4	16.4
Drive shaft loading						Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!	Radial and axial forces cannot be absorbed!
Mounting type						Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting	Front face mounting
Line connections						Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings	Screw-in fittings
Direction of rotation, viewed on drive shaft						clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise	clockwise
Hydraulic fluid
Permissible hydraulic fluid 1)						Mineral oil (HLP) to DIN 51524-2
Operating temperature range					°C	-10 … +70
Viscosity range					mm²/s	10 … 200
Maximum admissible degree of contamination of the hydraulic fluid 1)						Class 20/18/15 according to ISO 4406 (c)

1)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

Flow/drive power 1)
Inner diameter of the cylinders mm	Stroke mm	Vg cm3	Pressure	bar	50	100	150	200	250	300	350	400	450	500	550	600	650	700
10	6.4	0.51	qV, eff	l/min	0.71	0.7	0.69	0.69	0.69	0.685	0.68	0.68	0.675	0.67	0.67	0.665	0.66	0.66
10	6.4	0.51	PA	kW	0.093	0.164	0.231	0.29	0.358	0.42	0.481	0.54	0.605	0.67	0.739	0.81	0.888	0.97
10	9.1	0.71	qV, eff	l/min	1.02	1.01	1.0	0.995	0.99	0.985	0.98	0.975	0.97	0.965	0.96	0.955	0.95	0.94
10	9.1	0.71	PA	kW	0.129	0.23	0.328	0.41	0.503	0.58	0.677	0.77	0.856	0.94	1.046	1.16	1.257	1.36
10	11.0	0.86	qV, eff	l/min	1.22	1.21	1.205	1.2	1.195	1.19	1.184	1.18	1.174	1.17	1.163	1.157	1.147	1.14
10	11.0	0.86	PA	kW	0.15	0.275	0.392	0.49	0.594	0.70	0.804	0.91	1.018	1.13	1.244	1.37	1.486	1.61
15	6.4	1.13	qV, eff	l/min	1.6	1.59	1.58	1.567	1.56	1.556	1.546	1.54	1.53	1.523	–	–	–	–
15	6.4	1.13	PA	kW	0.213	0.40	0.547	0.7	0.85	1.00	1.14	1.27	1.433	1.566	–	–	–	–
15	9.1	1.61	qV, eff	l/min	2.28	2.26	2.25	2.24	2.23	2.22	2.20	2.19	2.18	2.17	–	–	–	–
15	9.1	1.61	PA	kW	0.27	0.49	0.71	0.91	1.11	1.31	1.51	1.70	1.91	2.12	–	–	–	–
15	11.0	1.94	qV, eff	l/min	2.74	2.73	2.71	2.7	2.68	2.67	2.65	2.64	2.62	2.6	–	–	–	–
15	11.0	1.94	PA	kW	0.32	0.57	0.826	1.06	1.31	1.55	1.80	2.05	2.29	2.53	–	–	–	–

1)	Mean values measured at n = 1450 rpm, Θ = 50 °C

Uniformity coefficient f relative to n = 1450 rpm

The values from "Flow/drive power" table relate to 1 cylinder each.

To determine the required drive power, multiply the specified value by the number of cylinders.

The uniformity coefficient f should be taken into account.

Radial piston pump (specifications apply for a frequency of 50 Hz)
3 cylinders		5 or 10 cylinders
Loaded cylinder	Factor f	Loaded cylinder	Factor f
1	3.13	1	3.13
		1+2	1.89
1+2	1.57	1+3	1.57
		1+2+3	1.60
		1+3+4	1.35
		1+2+3+4	1.30
1+2+3	1.00	1+2+3+4+5	1.00

At pumps with 10 cylinders, 2 cylinders each are switched at a pressure port.

▼ Example: Pump PR4–3X/1,60–700RA01M02

Port 1 and 2 are connected together and loaded with 450 bar, 3 is circulating at zero pressure.

PA = 2 × 0.605 kW = 1.21 kW

f = 1.57

Perf = 1.21 kW × 1.57 = 1.90 kW

Port 3 loaded with 300 bar, 1 and 2 run without pressure.

PA = 1 × 0.42 kW = 0.42 kW

f = 3.13

Perf = 0.42 kW × 3.13 = 1.31 kW

Port 1, 2 and 3, each loaded with 200 bar.

PA = 3 × 0.29 kW = 0.87 kW

f = 1

Perf = 0.87 kW × 1 = 0.87 kW

For applications outside these parameters, please consult us!

Sound pressure level (average):

(measured at n = 1450 min-1, v = 41 mm2/s and ϑ = 50 °C in a sound measuring chamber according to DIN 45635, part 26, Distance microphone – pump = 1 m)

The characteristic curves do not apply for versions with multiple circuits.

3-piston pump

5-piston pump

10-piston pump

Characteristic curves – Flow:

(measured at n = 1450 min-1, v = 41 mm2/s and ϑ = 50 °C)

Characteristic curves – Drive power:

(measured at n = 1450 min-1, v = 41 mm2/s and ϑ = 50 °C)

Radial piston pump with 3 pistons

Dimensions in mm

1)	Pipe thread according to ISO 228/1
2)	With line connection with characteristic 12, according to ANSI B 1.1
3)	With line connection with characteristic 12, connection adapter (SAE-12; 1 1/16-12 UN) according to ANSI B 1.1 not included in the scope of delivery

Radial piston pump with 5 pistons

Dimensions in mm

1)	Pipe thread according to ISO 228/1
2)	With line connection with characteristic 12, according to ANSI B 1.1
3)	With line connection with characteristic 12, connection adapter (SAE-12; 1 1/16-12 UN) according to ANSI B 1.1 not included in the scope of delivery

Cylindrical shaft end Shaft end with serration according to DIN 5481

Radial piston pump with 10 pistons

Characteristic 01, 02 and 08
Dimensions in mm

1)	Pipe thread according to ISO 228/1
2)	With line connection with characteristic 12, according to ANSI B 1.1
3)	With line connection with characteristic 12, connection adapter (SAE-20; 1 5/8-20 UN) according to ANSI B 1.1 not included in the scope of delivery

Cylindrical shaft end Shaft end with serration according to DIN 5481

Radial piston pump with 10 pistons

Characteristic 11 and 12
Dimensions in mm

1)	Pipe thread according to ISO 228/1
2)	With line connection with characteristic 12, according to ANSI B 1.1
3)	With line connection with characteristic 12, connection adapter (SAE-20; 1 5/8-20 UN) according to ANSI B 1.1 not included in the scope of delivery

Cylindrical shaft end Shaft end with serration according to DIN 5481

Pump combination P2R4...

Other dimension see Dimensional drawings of PR4

L1	mm	38.5
L2	mm	86.8
L3	mm	124.2	125.4	127.5	131.3	131.8			139.4	147.5	148.1
L4	mm	170.5	173	177.1	182.1	187.1	190.5	195.5	200.9	217.3	222.1
Ø D1	mm	40								55
	mm	± 0.15
Ø D2	mm	15		20						26
Ø D3	mm	35
	mm	± 0.15
Ø D4	mm	15
H1	mm	15.7
G		M6
	mm	13

Pump combination P3R4...

Other dimension see Dimensional drawings of PR4

L1	mm	38.5
L2	mm	86.8
L3	mm	125.4	127.5		131.3
L4	mm	208.4	212.5	215.8	217.5	218.7	220.8	233.5
L5	mm	254.7	258.8	265.4	263.8	266.3	270.4	292.2
Ø D1	mm	40
	mm	± 0.15
Ø D2	mm	15	20
Ø D3	mm	40
	mm	± 0.15
Ø D4	mm	15		20	15		20
Ø D5	mm	35
	mm	± 0.15
Ø D6	mm	15
Ø D7	mm	35
	mm	± 0.15
Ø D8	mm	15
H1	mm	15.7
G		M6
	mm	13

Installation instructions

Fluid tank

Adjust useful volume of the tank to the operating conditions. The admissible fluid temperature must not be exceeded; use coolers, if necessary.

Lines and ports

Remove protection plugs from the pump. We recommend the use of seamless precision steel pipes according to DIN EN 10305-1 and removable pipe connections. Select the clear width of pipes according to the ports (suction speed 1 to 1.5 m/s). Inlet pressure, see technical data. Thoroughly clean pipelines and fittings prior to installing.

Proposal for piping layout

Under no circumstances may drain and returning fluid be drawn directly into the suction port again, i.e., select the largest possible distance between suction line and return line. The return drain must always be below the oil level. Ensure suction-tight installation of the pipes.

Filter

Use a return flow or pressure filter, if possible.

(Suction filters only in connection with underpressure switch/clogging indicator).

Hydraulic fluid

Please observe our specifications according to data sheet 90220. We recommend brand name hydraulic fluids. Do not mix hydraulic fluids of different types since this can result in decomposition and deterioration of the lubricity. The hydraulic fluid must be replaced at regular intervals according to the operating conditions. When doing this, the hydraulic fluid reservoir must also be cleaned of residues.

Drive

Electric motor + pump carrier + coupling + pump

No radial or axial forces permissible on the pump drive shaft! Motor and pump must be exactly aligned! Always use a coupling that is suitable for compensating for shaft offsets! When installing the coupling, avoid axial forces, i.e., when installing, do not hammer or press the coupling onto the shaft! Use the female thread on the drive shaft.

Installation positions

B3

B5

V1

Project planning information

When using radial piston pumps, we recommend particularly observing the information specified below. Project planning, assembly and commissioning of the radial piston pumps require the employment of trained experts.

Technical data

All specified characteristic depend on production tolerances and are valid at certain boundary conditions. Please note that consequently, certain scatter ranges are possible and that with changed boundary conditions (e.g. viscosity), the characteristics may also change.

Characteristic curves for flow and consumed power

When designing the drive motor, please observe the maximum application parameters possible.

Noise

The values for sound pressure level shown under Diagrams/characteristic curves have been measured according to DIN 45635 part 26. That means only the sound emission of the pump is shown. Environmental influences (such as place of installation, piping, etc.) have been eliminated. The values are in each case only valid for one pump. For circulation at zero pressure, the pressure line must be preloaded by means of a check valve (cracking pressure p = 5 bar) due to noise development.

Notice

Due to the power unit construction and the influence at the final place of installation of the pump, the sound pressure level will usually be 5 to 10 dB(A) higher than the value of the pump itself.

Project planning information for multiple pumps

Project planning information for multiple pumps The same general technical data apply as for single pumps. The pump with the higher load (pressure x flow) should be the first pump stage. When combining several pumps, the occurring torques may reach inadmissibly high values. The total of the torques must not exceed the admissible values (see table below)
Pump type	Max. admissible
Pump type	Drive torque Tmax	Output torque Tmax
PR4...	160 Nm	45 Nm
AZPF...	45 Nm	45 Nm
AZPFF...	45 Nm	45 Nm

Single pump	Example: Pump combinationP3R4-3X/3.15-700...+AZPFF8-4 Tab2 = 45 Nm T3 = 3.8 Nm ≤ Tab2 max Tab1 = 45 Nm T1,2 = T2 + T3 T1,2 = 18.8 Nm ≤ Tab1 max Tmax = 160 Nm T = T1 + T2 + T3 T = 63 Nm ≤ Tmax
Combination pump
Calculation example: V = displacement in cm3 ηhydr.-mech. = hydraulic-mechanical efficiency T = torque in Nm Δp = pressure in bar	The pump combination can be operated with the calculated key data.

Commissioning instructions

Air bleeding

All PR4 radial piston pumps are self-priming. Fill the housing with filtered oil via port S. During initial commissioning, set the pump to pressureless circulation. To do so, release the pressure hose and direct it into the reservoir. Before initial commissioning, the pump must be air-bled to protect it against damage. Switch to pressureless circulation, or direct the pressure line or pressure hose back into the reservoir. Briefly switch the pump on (inching mode). Should the pump not displace bubble-free oil after approx. 20 seconds, re-check the system. After the operating values have been reached, check the pipe connections for leakage. Check the operating temperature. Be aware of noise generation.

Commissioning

Check whether the system is thoroughly and properly installed. Start the pump without load and let it displace fluid without pressure for a few seconds in order to ensure sufficient lubrication. In no case may the pump be operated without hydraulic fluid!

Note

Adjustment, maintenance and repair of the pump may only be carried out by authorized, trained and instructed personnel! Use only original Rexroth spare parts! The pump may only be operated within the permissible data. The pump may only be operated when in perfect condition! When carrying out any work on the pump (e.g. installation and removal) the system must be switched off and depressurized! Unauthorized conversions and changes, affecting the safety and function are not permissible! Mount protective devices (e.g., coupling protection)! Do not remove any existing protective devices! The generally valid safety and accident prevention regulations must be strictly observed!

RADIAL PISTON PUMP PR4-3X/3,15-700RA12M01

Manufacturer: Bosch Rexroth

Material #: R901094072

Model : PR4-3X/3,15-700RA12M01

More are expected on October 21, 2024

This product is eligible for factory repair.

Assembly

Suction and displacement procedure

Design options with multi-circuit pumps

3-piston pump

5-piston pump

10-piston pump

Radial piston pump with 3 pistons

Radial piston pump with 5 pistons

Radial piston pump with 10 pistons

Radial piston pump with 10 pistons

Pump combination P2R4...

Pump combination P3R4...

Installation instructions

Proposal for piping layout

Drive

B3

B5

V1

Project planning information

Project planning information for multiple pumps

Project planning information for multiple pumps

Commissioning instructions

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