InterpumpPumps & Compressors

Interpump PUMP WS251 DX U.S. + GEARBOX RS500

The Interpump WS251 DX is an industrial pump with integrated gearbox delivering 15 L/min at 250 bar pressure, powered by a 7.35 kW motor operating at 1450 rpm. Compact and robust, it serves high-pressure…

SKU 3G-ITP-01946

Also listed as: WS025100UR001 · WS025100U R001

Brand

Interpump

Item

PUMP WS251 DX U.S. + GEARBOX RS500

Local availability & support — Singapore

Local office: 20 Woodlands Link #09-05, Singapore 738733
Phone: +65 8878 8355
Delivery: Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment: Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to: Singapore

Technical Specifications

Interpump

Flow Rate

15 L/min

Pressure

250 bar

Power

7.35 kW

Speed

1450 RPM

Weight

14.5 kg

Dimensions

317.5 mm

Power

10 HP

Flow (US)

3.96 GPM

Pressure

25 MPa

Pressure

3625 PSI

Datasheet Content

WS251




TECHNICAL INFORMATION
Flow (L/min)                        15
Flow (US Gpm)                       3,96
Rotation regime (rpm)               1450
Pressure (MPa)                      25
Pressure (bar)                      250
Pressure (psi)                      3625
Power (hp)                          10
Power (kW)                          7,35
Overall dimensions L x l x h (mm)   317,5x236x180
Weight (kg)                         14,5




WS251                                               3/21/2026   Page 1 - 8
Copyright INTERPUMP GROUP S.P.A
WS251

     Documents

Male shaft (key)

Male shaft (key) - vers. ATEX




WS251                             3/21/2026   Page 2 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)




WS251                             3/21/2026   Page 3 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)

Pos.    Code            Description                   Qty Notes
KIT71   34007101        KIT 71 INTERMEDIATE RING      1
                        D.20
KIT7    34000701        KIT 7 HEAD RING D.20          1
KIT69   34006901        KIT 69 PACKING D.20 W/RESTOP 1


KIT6    34000601        KIT 6 PISTON BOLT             1
KIT3    34000301        KIT 3 OIL SEAL D.30X55X7      1
KIT28   34002801        KIT 28 COMPL.SEAL FOR         1
                        PIST.D20
KIT2    34000201        KIT 2 OIL SEAL D. 22X32X5,5   1

KIT10   34001001        KIT 10 PACKING RETAINER D.20 1


KIT1    34000101        KIT 1 INTAKE/DELIVERY VALVE 1


55      90270500        PACKING 20x35x7,5             3
54      96738000        WASHER 17,5X23X1,5            1
53      98210000        PLUG G3/8X13                  1
52      96751400        WASHER 21,5X27X1,5            1
51      98217600        PLUG G1/2X10                  1
50      96710600        WASHER 10,2                   4
49      99364400        SCREW M 10x18-5931            4
48      47200074        PUMP FOOT                     2
47      90270400        RESTOP RING D. 20 TYPE 6/1    3


46      47216970        INTERM.RING D. 20 (SPEC.)     3


45      47100051        HEAD RING D. 20               3
44      90271000        PACKING D.20X35X9 L.P.        3
43      47080570        PACKING RETAINER D. 20x35     3


42      90361600        O-RING 34,65X1,78 (2137)      3
41      90164800        OIL SEAL 30x55x7              1
40      97567800        SHIM D.74,5X104X0,1           1
40      97568000        SHIM D.74.5X104X0.3           1
39      47151022        OPEN SIDE COVER (47-66)       1
38      47219566        PISTON SCREW                  3
37      96728000        WASHER 14X18,5X0,5            3
36      90506700        ANTI-EXTRUSION RING           3
35      47040409        PISTON D. 20x50               3
34      96728600        WASHER 14X28X0,5              3
32      99309900        SCREW M 8x35 UNI 5931         6
31      90358500        O-RING 10,82X1,78 (2043)      4
30      98204250        PLUG G1/4"x12                 1
29      47221301        OIL SIGHT GLASS ASSY G3/4     1




WS251                                                             3/21/2026   Page 4 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)

Pos.   Code             Description                   Qty Notes

28     47160622         CRANKCASE COVER               1
27     99188400         SCREW M 6x20 UNI 5931         5
26     47030001         CONNECTING ROD                3
25     47050466         PISTON GUIDE - S.S.           3
24     97738000         CONNECTING-ROD PIN            3
                        D.13X35,5
23     91489000         KEY 8X7X35                    1
22     90055700         CIRCLIP D.12 UNI 7435         6
21     47021835         CRANKSHAFT C.12 S.p.f. U.S.   1


20     90392200         O-RING D.133.02X 2,62(3525)   1


19     98210600         OIL DIP-STICK G3/8X80         1
18     47010822         CRANKCASE                     1
17     90912600         BUSHING 22X25X30              3
16     90162500         OIL SEAL 22x32x5              3
15     91837800         TAPER BEARING 32206 SKF       2
14     90391300         O-RING 67,95X2,62 (3268)      2
13     47151122         CLOSED SIDE COVER (47-66)     1


12     99303900         SCREW M 8x16 UNI 5931         8
11     36703201         VALVE ASSY.                   6
10     98222800         PLUG M24x1,5x17,5             6
9      90384700         O-RING 20,29X2,62(3081)       6
8      36200251         VALVE CAGE                    6
7      94737600         SPRING D. 9,4X14,8            6
6      36200176         VALVE PLATE                   6
5      36200366         VALVE SEAT                    6
4      90384100         O-RING 17,12X2,62 (3068)      6
2      99320600         HEX-HEAD SCREW M08X70         8
                        UNI5737 10.9 Fe/Zn5c1A+De

1      47121741         MANIFOLD                      1




WS251                                                             3/21/2026   Page 5 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - vers. ATEX




WS251                                        3/21/2026   Page 6 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - vers. ATEX

Pos.    Code            Description                   Qty Notes
KIT71   34007101        KIT 71 INTERMEDIATE RING      1
                        D.20
KIT7    34000701        KIT 7 HEAD RING D.20          1
KIT69   34006901        KIT 69 PACKING D.20 W/RESTOP 1


KIT6    34000601        KIT 6 PISTON BOLT             1
KIT3    34000301        KIT 3 OIL SEAL D.30X55X7      1
KIT28   34002801        KIT 28 COMPL.SEAL FOR         1
                        PIST.D20
KIT2    34000201        KIT 2 OIL SEAL D. 22X32X5,5   1

KIT10   34001001        KIT 10 PACKING RETAINER D.20 1


KIT1    34000101        KIT 1 INTAKE/DELIVERY VALVE 1


60      99180900        SCREW M06X10 5931 A2-70       1
59      96693950        WASHER 6.4x11.0x0.7 D6798A    1
                        INOX
58      90387700        O-RING 39,34X2,62 (3156)      1
57      70211751                                      1
56      90075500        STOP RING J45 UNI7437         1
55      90270500        PACKING 20x35x7,5             3
54      96738000        WASHER 17,5X23X1,5            1
53      98210000        PLUG G3/8X13                  1
52      96751400        WASHER 21,5X27X1,5            1
51      98217600        PLUG G1/2X10                  1
50      96710600        WASHER 10,2                   4
49      99364400        SCREW M 10x18-5931            4
48      47200074        PUMP FOOT                     2
47      90270400        RESTOP RING D. 20 TYPE 6/1    3


46      47216970        INTERM.RING D. 20 (SPEC.)     3


45      47100051        HEAD RING D. 20               3
44      90271000        PACKING D.20X35X9 L.P.        3
43      47080570        PACKING RETAINER D. 20x35     3


42      90361600        O-RING 34,65X1,78 (2137)      3
41      90164800        OIL SEAL 30x55x7              1
40      97567800        SHIM D.74,5X104X0,1           1
40      97568000        SHIM D.74.5X104X0.3           1
39      47151022        OPEN SIDE COVER (47-66)       1
38      47219566        PISTON SCREW                  3
37      96728000        WASHER 14X18,5X0,5            3
36      90506700        ANTI-EXTRUSION RING           3




WS251                                                             3/21/2026   Page 7 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - vers. ATEX

Pos.   Code             Description                   Qty Notes

35     47040409         PISTON D. 20x50               3
34     96728600         WASHER 14X28X0,5              3
32     99309900         SCREW M 8x35 UNI 5931         6
31     90358500         O-RING 10,82X1,78 (2043)      4
30     98203600         PLUG G1/4x8 FOR PROBE D.6     1
                        S.S.
29     98226600         PLUG G3/4X16 S.S.             1
28     47160622         CRANKCASE COVER               1
27     99188400         SCREW M 6x20 UNI 5931         5
26     47030001         CONNECTING ROD                3
25     47050466         PISTON GUIDE - S.S.           3
24     97738000         CONNECTING-ROD PIN            3
                        D.13X35,5
23     91489000         KEY 8X7X35                    1
22     90055700         CIRCLIP D.12 UNI 7435         6
21     47021735         CRANKSHAFT C.16 S.p.f. U.S.   1


21     47021835         CRANKSHAFT C.12 S.p.f. U.S.   1


20     90392200         O-RING D.133.02X 2,62(3525)   1


19     98210700         OIL DIPSTICK G3/8X64          1
                        D4+FILTER ATEX
18     47010822         CRANKCASE                     1
17     90912600         BUSHING 22X25X30              3
16     90162500         OIL SEAL 22x32x5              3
15     91837800         TAPER BEARING 32206 SKF       2
14     90391300         O-RING 67,95X2,62 (3268)      2
13     47151322         SIDE CRANKCASE COVER (ATEX) 1


12     99303900         SCREW M 8x16 UNI 5931         8
11     36703201         VALVE ASSY.                   6
10     98222800         PLUG M24x1,5x17,5             6
9      90384700         O-RING 20,29X2,62(3081)       6
8      36200251         VALVE CAGE                    6
7      94737600         SPRING D. 9,4X14,8            6
6      36200176         VALVE PLATE                   6
5      36200366         VALVE SEAT                    6
4      90384100         O-RING 17,12X2,62 (3068)      6
2      99320600         HEX-HEAD SCREW M08X70         8
                        UNI5737 10.9 Fe/Zn5c1A+De

1      47121741         MANIFOLD                      1




WS251                                                             3/21/2026   Page 8 - 8
Copyright INTERPUMP GROUP S.P.A

Technical Documents

(1)

Technical Data Sheet

PDF Document

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Interpump Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is the Interpump WS251 DX pump with gearbox used for?

The Interpump WS251 DX with integrated RS500 gearbox is an industrial pump for high-pressure fluid-transfer applications. It delivers 15 L/min at 250 bar, making it suitable for manufacturing processes and hydraulic systems that require reliable, compact pumping at 1450 rpm.

What are the specifications of the Interpump WS251 DX pump?

The Interpump WS251 DX pump delivers 15 L/min flow at 250 bar pressure, powered by a 7.35 kW (10 hp) motor at 1450 rpm. It weighs 14.5 kg and has overall dimensions of 317.5 x 236 x 180 mm. The integrated RS500 gearbox ensures compact, robust operation.

Where to buy the Interpump WS251 DX pump in Singapore?

3G Electric sources and delivers the Interpump WS251 DX pump to Singapore. We handle logistics, customs clearance, and local delivery for industrial buyers. Contact our team for pricing and lead time on this high-pressure pump with integrated gearbox.

How to maintain the Interpump WS251 DX pump?

Regular maintenance of the Interpump WS251 DX pump includes checking oil level via the sight glass, inspecting seals and packing kits (e.g., KIT69 packing D.20 with restop), and replacing worn piston bolts or oil seals. Always follow Interpump's guidelines for safe operation at 250 bar.

Used in

Common applications for Interpump

Shipyard hull cleaning and surface prep — HT100 and W951 paired with dual-lance guns for dockyard service

Petrochemical heat-exchanger descaling — WS-series stainless pumps for neutral-pH cleaning chemistry

Outdoor HVAC condenser mist cooling — ZP180 pumps on rooftop chiller decks

Textile fibre-finishing — W170 and W270 for mist-jet application across drying lines

Municipal water treatment — W951 motor pumps for high-pressure disinfection chemical injection

Spare Parts & Repair Kits

Official WS251 parts list — 128 parts, 62 available in catalog

Official Parts List

WS251 — Male shaft (key) exploded diagram

Repair Kits — Order These for Routine Maintenance

KIT1

KIT 1 INTAKE/DELIVERY VALVE

34000101×1Available

Interpump PUMP WS251 DX U.S. + GEARBOX RS500

Local availability & support — Singapore

Technical Specifications

Datasheet Content

Technical Documents

Need installation or engineering help?

Ask a question

Product Description

Frequently Asked Questions

Used in

Spare Parts & Repair Kits

Interpump Products

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