DW Series - Rotary Lobe Pumps

Product Type(s) : Positive Displacement Pumps

Description :

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

WHERE TO BUY

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

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)

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)

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

	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

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.

DW Series - Rotary Lobe Pumps

FEATURES

Product Specifications

Model DW1/003/-

Model DW1/004/-

Model DW1/007/-

Model DW2/006/-

Model DW2/007/-

Model DW2/013/-

Model DW3/014/-

Model DW3/017/-

Model DW3/030/-

Model DW3/050/-

Model DW4/033/-

Model DW4/039/-

Model DW4/073/-

Model DW4/125/-

Model DW5/080/-

Model DW5/093/-

Model DW5/142/-

Model DW5/256/-

Model DW6/172/-

Model DW6/198/-

Model DW6/308/-

Model DW6/519/-

Downloads