Back to Main
PRODUCTS
Contact Us Processing News LinkedIn Twitter YouTube Channel

DW Series - Rotary Lobe Pumps

Product Type:
Pumps / Rotary Lobe Pumps

DW - A rotary lobe pump with high volumetric efficiency and versatility.

We are here to help!

Contact Us
Where To Buy
Features

The DW series is a rotary lobe pump. The 26 DW models are hygienic, 3-A and EHEDG approved and cover all requirements from 3 litres /100 revs to 1016/100 revs. Maximum pressure up to 435 psi (30 bar.) All product contact parts are AISI 316L stainless steel and elastomers comply with FDA-requirements.

Benefits

  • High volumetric efficiency-  The DW model range is designed according to the principle: 'More pump for your money'. Internal clearances have been minimized making the pump so efficient that in medium viscosity applications a smaller pump size than usual will do the job. This reduces both initial investment and running costs.
  • Ultra-hygienic, accommodates harsh CIP-cycles -  All DW models are CIP/SIP cleanable. The pumps are designed to withstand rapid temperature changes and can therefore accommodate very harsh CIP-cycles.
  • Pulse-free performance -  When pumping highly viscous products, the DW circumferential piston pumps run completely pulse-free. This ensures a constant process flow, as required for instance in connection with filling machines, safeguards valves, and other equipment that is liable to damage through pressure surges.
  • Low NPSH-requirement -  The highly improved suction capabilities of the DW pump considerably reduce the NPSH-requirement (Net Positive Suction Head required). In combination with the absence of pressure pulsations, this makes the DW pumps ideal for many applications, such as ultra-filtration.
  • Gentle product handling - The rotor designs ensure maximum product integrity and minimize risk of potential damage to sensitive products. The circumferential piston rotors, as well as the new twin lobe rotors are suitable both for high and low viscosities and will also handle cheese curds and whey, soft fruit and meat which until now required fitting of special rotors.
  • Easy Maintenance  - The easy-to-access front loaded mechanical seals reduce maintenance time considerably. All shaft seal O-rings are identical and access to the shaft seal is achieved by simply removing the front cover and the rotors. Likewise, timing of rotors is an uncomplicated procedure.
  • Low noise levels - Unique rotor design practically eliminates hydraulic noise and the helical gears minimize gearbox noise.
Theory of Operation

DW pumps are positive-displacement, low-slip, stainless steel pumps designed with larger diameter shafts for greater strength and stiffness, mounted on a heavy-duty cast iron bearing frame (stainless steel option available) with double-tapered roller bearings.

Callouts:

1. Profiled Front Cover Gasket

2. Front Cover

3. Bearing, front

4. Bearing, rear

5. Shaft, main

6. Shaft, auxillary

7. Gears

8. Clamp ring

9. Feet

10. Rotor Case

11. Rotor Nut

12. Rotor

 

 

Expanding cavities are formed at the inlet drawing the liquid into the rotors. Meshing of the rotors forces the fluid out of the pumping chamber.

Product in Blue

 

Empty Cavity
Key Applications

Food & Beverages

  • Fruit Preserves
  • Soups and Sauces
  • Baby Food
  • Chocolate
  • Fruit Juice
  • Cider and Wine
  • Yeast
  • Liquid Sugar and Glucose

Dairy

  • Cream
  • Butter
  • Cheese Curd & Whey
  • Yogurt
  • Ice cream

Pharmaceutical and Toiletries

  • Antibiotics
  • Toothpaste
  • Cough Medicine
  • Shampoo

Chemicals

  • Paint
  • Oil Additives
  • Resins
  • Photographic Film Coatings
Specifications

The DW pump is designed for ultra-hygienic applications. The range consists of 26 models with capacities ranging from 0.8 gal/100 revs to 268 gal/100 revs (3 liters/100 revs to 1,016 liters /100 revs) and pressures up to 435 psi (30 bar). All product-contact parts are made from AISI 316L stainless steel and all elastomers comply with FDA-requirements.

There are two rotor types (piston and bi-lobe) available. The piston rotors can be easily changed to bi-lobe rotors without changing the rotor case. The porting on the pump can also be changed from horizontal to vertical (and vice versa) without any modification to the pump or use of a special gear case assembly.

MODEL

ROTOR TYPE

MAXIMUM DISPLACEMENT
GAL/100 REVS (LITERS/100 REVS)

MAXIMUM PRESSURE
PSI (BAR)

DW1/003/7.5 Piston 0.8 (3) 109 (7.5)
DW1/004/15 Bi-lobe 1.1 (4) 218 (15)
DW1/007/7 Bi-lobe 1.8 (7) 102 (7)
DW2/006/10 Piston 1.6 (6) 145 (10)
DW2/007/20 Bi-lobe 1.8 (7) 200 (20)
DW2/013/10 Bi-lobe 3.4 (13) 145 (10)
DW3/014/10 Piston 3.7 (14) 145 (10)
DW3/017/20 Bi-lobe 4.5 (17) 290 (20)
DW3/030/10 Bi-lobe 7.9 (30) 145 (10)
DW3/050/5 Bi-lobe 13.2 (50) 73 (5)
DW4/033/10 Piston 8.7 (33) 145 (10)
DW4/039/20 Bi-lobe 10.3 (39) 290 (20)
DW4/073/10 Bi-lobe 19.3 (73) 145 (10)
DW4/125/5 Bi-lobe 33.0 (125) 73 (5)
DW5/080/12.5 Piston 21.1 (80) 181 (12.5)
DW5/093/25 Bi-lobe 24.6 (93) 363 (25)
DW5/142/15 Bi-lobe 37.5 (142) 218 (15)
DW5/256/7 Bi-lobe 67.6 (256) 102 (7)
DW6/172/12.5 Piston 45.4 (172) 218 (15)
DW6/198/30 Bi-lobe 52.3 (198) 435 (30)
DW6/308/15 Bi-lobe 81.4 (308) 218 (15)
DW6/519/07 Bi-lobe 137.1 (519) 102 (7)
Dimensions

Model DW1/003/-


 

  B C D E F G H J K L M N P Q S T U W
IN 8.54 1.57 1.5 4.29 4.76 0.47 5.75 5.9 6.53 4.8 7.6 3.7 3.27 DN15 218 86 18 8
MM 217 40 38 109 121 12 146 150 166 122 193 94 83 218 86 18 8 17

Weight:  37.48 lbs (17 Kg)

Oil Capacity:  0.21 GAL (0.8 L)

Model DW1/004/-


 

  B C D E F G H J K L M N P Q S T U W
IN 8.54 1.57 1.5 4.29 4.76 0.47 5.75 5.9 6.53 4.8 7.6 3.7 3.27 DN15 8.58 3.38 0.71 0.31
MM 217 40 38 109 121 12 146 150 166 122 193 94 83   218 86 18 8

Weight:  37.48 lbs (17 Kg)

Oil Capacity:  0.21 GAL (0.8 L)

Model DW1/007/-


 

  B C D E F G H J K L M N P Q S T U W
IN 8.74 1.57 1.5 4.29 4.76 0.47 5.75 5.9 6.53 4.8 7.6 3.7 3.27 1 8.58 3.38 0.71 0.31
MM 222 40 38 109 121 12 146 150 166 122 193 94 83 25 218 86 18 8

Weight:  39.68 lbs (18 Kg)

Oil Capacity:  0.21 GAL (0.8 L)

Model DW2/006/-


 

  B C D E F G H J K L M N P Q S T U W
IN 9.76 1.97 1.42 4.72 5.59 0.67 6.93 7.01 7.64 5.71 8.98 4.41 3.82 1 9.92 3.86 0.87 0.47
MM 248 50 36 120 142 17 176 178 194 145 228 112 97 25 252 98 22 12

Weight:  55.11 lbs (25 Kg)

Oil Capacity:  0.34 GAL (1.3 L)

Model DW2/007/-


 

  B C D E F G H J K L M N P Q S T U W
IN 9.76 1.97 1.42 4.72 5.59 0.67 6.93 7.01 7.64 5.71 8.98 4.41 3.82 1 9.92 3.86 0.87 0.47
MM 248 50 36 120 142 17 176 178 194 145 228 112 97 25 252 98 22 12

Weight:  55.11 lbs (25 Kg)

Oil Capacity:  0.34 GAL (1.3 L)

Model DW2/013/-


 

  B C D E F G H J K L M N P Q S T U W
IN 9.92 1.97 1.42 4.72 5.59 0.67 6.93 7.01 7.64 5.71 8.98 4.41 3.82 1.5 9.92 3.86 0.87 0.47
MM 252 50 36 120 142 17 176 178 194 145 228 112 97 38 252 98 22 12

Weight:  59.52 lbs (27 Kg)

Oil Capacity:  0.34 GAL (1.3 L)

Model DW3/014/-


 

  B C D E F G H J K L M N P Q S T U W
IN 10.67 2.36 1.57 4.84 6.3 0.79 7.87 7.72 8.35 6.22 9.92 4.72 4.17 1.5 10.75 4.41 0.98 0.51
MM 271 60 40 123 160 20 200 196 212 158 252 120 106 38 273 112 25 13

Weight:  74.96 lbs (34 Kg)

Oil Capacity:  0.37 GAL (1.4 L)

Model DW3/017/-


 

  B C D E F G H J K L M N P Q S T U W
IN 10.67 2.36 1.57 4.84 6.3 0.79 7.87 7.72 8.35 6.22 9.92 4.72 4.17 1.5 10.75 4.41 0.98 0.51
MM 271 60 40 123 160 20 200 196 212 158 252 120 106 38 273 112 25 13

Weight:  74.96 lbs (34 Kg)

Oil Capacity:  0.37 GAL (1.4 L)

Model DW3/030/-


 

  B C D E F G H J K L M N P Q S T U W
IN 11.02 2.36 1.57 4.84 6.3 0.79 7.87 7.72 8.35 6.22 9.92 4.72 4.17 2 10.75 4.41 0.98 0.51
MM 280 60 40 123 160 20 200 196 212 158 252 120 106 51 273 112 25 13

Weight:  88.18 lbs (40 Kg)

Oil Capacity:  0.37 GAL (1.4 L)

Model DW3/050/-


 

  B C D E F G H J K L M N P Q S T U W
IN 11.97 2.36 1.57 4.84 6.3 0.79 7.87 7.72 8.35 6.22 9.92 4.72 4.17 2 10.75 4.41 0.98 0.51
MM 304 60 40 123 160 20 200 196 212 158 252 120 106 51 273 112 25 13

Weight:  99.21 lbs (45 Kg)

Oil Capacity:  0.37 GAL (1.4 L)

Model DW4/033/-


 

  B C D E F G H J K L M N P Q S T U W
IN 13.86 3.15 1.77 6.38 8.07 0.79 9.64 9.37 10.24 7.48 11.81 5.59 5.12 2 12.91 5.12 1.38 0.55
MM 352 80 45 162 205 20 245 238 260 190 300 142 130 51 328 130 35 14

Weight:  141.09 lbs (64 Kg)

Oil Capacity:  0.79 GAL (3.0 L)

Model DW4/039/-


 

  B C D E F G H J K L M N P Q S T U W
IN 14.37 3.15 1.77 6.38 8.07 0.79 9.64 9.37 10.24 7.48 11.81 5.59 5.12 3 12.91 5.12 1.38 0.55
MM 365 80 45 162 205 20 245 238 238 260 190 300 142 130 76 328 130 35

Weight:  158.73 lbs (72 Kg)

Oil Capacity:  0.79 GAL (3.0 L)

Model DW4/073/-

Model DW4/125/-


 

  B C D E F G H J K L M N P Q S T U W
IN 15.71 3.15 1.77 6.38 8.07 0.79 9.64 9.37 10.24 7.48 11.81 5.59 5.12 3 12.91 5.12 1.38 0.55
MM 399 80 45 162 205 20 245 238 260 190 300 142 130 76 328 130 35 14

Weight:  187.39 lbs (85 Kg)

Oil Capacity:  0.79 GAL (3.0 L)

Model DW5/080/-


 

  B C D E F G H J K L M N P Q S T U W
IN 18.86 4.17 2.79 9.13 10.31 0.98 12.28 11.93 12.83 9.45 14.57 6.97 6.42 2.5 17.09 6.5 1.65 0.67
MM 479 106 71 232 262 25 312 303 326 240 370 177 163 63 434 165 42 17

Weight:  332.90 lbs (151 Kg)

Oil Capacity: 1.85 GAL (7.0 L)

Model DW5/093/-


 

  B C D E F G H J K L M N P Q S T U W
IN 18.86 4.17 2.79 9.13 10.31 0.98 12.28 11.93 12.83 9.45 14.57 6.97 6.42 2.5 17.09 6.5 1.65 0.67
MM 479 106 71 232 262 25 312 303 326 240 370 177 163 63 434 165 42 17

Weight:  332.90 lbs (151 Kg)

Oil Capacity: 1.85 GAL (7.0 L)

Model DW5/142/-


 

  B C D E F G H J K L M N P Q S T U W
IN 19.49 4.17 2.79 9.13 10.31 0.98 12.28 11.93 12.83 9.45 14.57 6.97 6.42 3 17.09 6.5 1.65 0.67
MM 495 106 71 232 262 25 312 303 326 240 370 177 163 76 434 165 42 17

Weight:  337.30 lbs (153 Kg)

Oil Capacity: 1.85 GAL (7.0 L)

Model DW5/256/-


 

  B C D E F G H J K L M N P Q S T U W
IN 20.47 4.17 2.79 9.13 10.31 0.98 12.28 11.93 12.83 9.45 14.57 6.97 6.42 DN 17.09 6.5 1.65 0.67
MM 520 106 71 232 262 25 312 303 326 240 370 177 163 125 434 165 42 17

Weight:  379.19 lbs (172 Kg)

Oil Capacity: 1.85 GAL (7.0 L)

Model DW6/172/-


 

  B C D E F G H J K L M N P Q S T U W
IN 27.24 3.86 3.54 13.82 16.53 1.57 19.68 14.8 19.33 11.53 21.3 8.19 9.64 3 20.79 8.58 1.97 0.94
MM 692 98 90 351 420 40 500 376 491 293 541 208 245 76 528 218 50 24

Weight:  815.71 lbs (370 Kg)

Oil Capacity: 6.60 GAL (25 L)

Model DW6/198/-


 

  B C D E F G H J K L M N P Q S T U W
IN 27.24 3.86 3.54 13.82 16.53 1.57 19.68 14.8 19.33 11.53 21.3 8.19 9.64 3 20.79 8.58 1.97 0.94
MM 692 98 90 351 420 40 500 376 491 293 541 208 245 76 528 218 50 24

Weight:  815.71 lbs (370 Kg)

Oil Capacity: 6.60 GAL (25 L)

Model DW6/308/-


 

  B C D E F G H J K L M N P Q S T U W
IN 27.8 3.86 3.54 13.82 16.53 1.57 19.68 14.8 19.33 11.53 21.3 8.19 9.64 4 20.79 8.58 1.97 0.94
MM 706 98 90 351 420 40 500 376 491 293 541 208 245 102 528 218 50 24

Weight:  859.80 lbs (390 Kg)

Oil Capacity: 6.60 GAL (25 L)

Model DW6/519/-


 

  B C D E F G H J K L M N P Q S T U W
IN 28.82 3.86 3.54 13.82 16.53 1.57 19.68 14.8 19.33 11.53 21.3 8.19 9.64 DN 20.79 8.46 1.97 0.94
MM 732 98 90 351 420 40 500 376 491 293 541 208 245 150 528 215 50 24

Weight:  1014.12 lbs (460 Kg)

Oil Capacity: 6.60 GAL (25 L)

Options

Elastomer Material

Standard elastomer material is EPDM. FPM and Isolast (perfluoroelastomer) are also available.

   

Connections

The standard connections are S-Line. Other sanitary and industrial fittings are available.

   

Rotor Options

The two rotor types, which are available in three different versions, are suitable for product temperatures up to 230°F (110°C).

Multi Duty Rotors are standard rotors suitable for most applications. The clearance is greater than that of the high efficiency rotors.

High Efficiency Rotors are designed for low viscosity products. The size of the rotors has been increased and the clearance is minimal.

NGA Rotors are made of Non Galling Alloy (W88) for use with low viscosity products. The material allows the rotors to touch the pump housing with­out damaging the housing or the rotors. Low tolerances may therefore be applied without decreasing the reliability.

Bi-lobe rotors can be supplied as “high temperature” rotors, suitable for product temperatures up to 356°F (180°C). The rotors are smaller for expansion due to the temperature.

Lobe Type Rotor
Piston Type Rotor

Special Application Options

   
Rectangular Inlet for extremely high viscosity products. By applying a rectangular inlet, the inlet conditions are considerably improved.    
Thermal Jacket to provide a constant temperature level within the pump. This may be the solution for handling temperature-sensitive products such as chocolate.    
Relief Valve releases pressure within the pump when it becomes too high. The relief valve is needed if no other safety devices are installed.    
Downloads
Brochures
DW Rotary Lobe Pump ID-7000 US GB DE FR
Datasheets
DW Models 6 and 7 Rotary Lobe Pump ID-7008 GB
Manuals
DW Pump Spareparts Manual - ID-L453194 GB FI SV DK
DW Pump Spare Parts User Manual DK