FUEL
SUPPLY
SYSTEMS

Series 420
Pump
 

Series 420 Pump

The Simplex Series 420 Pump is an internal gear rotary pump precisely machined and assembled with only two moving parts. This pump achieves and retains its reliability over a wider range of viscosities and is much quieter than other pump designs. Pumping action is based on a rotor, idler gear and crescent-shaped partition cast integral with the cover. Optional automatic reversing is available.

The Series 420 Pump is designed for continuous duty applications where the pump runs nonstop for extended periods, for boiler feed loop applications, for noise sensitive applications, and for many other industrial pump applications. Viscosity range is up to 5000 SSU or greater when slower speed motors are used.

420 Series Pump
FEATURES

Models 420-424 up to 500 PSI

Rotors for Models 420-424 are made from bar stock

Models 426-428 up to 100 PSI

Rotors for Models 426-428 are made from forgings

Precision milled and ground rotors

Rotor shaft bushing support provided for increased reliability

Mechanical seal

Optional seals available for almost any temperature or fluid compatibility

Configurations from .5 GPM to 200 GPM

Pumping action is based on a rotor, idler gear and crescent-shaped partition cast integral with the cover

Optional automatic reversing
 

SERIES 420 PUMP

HOUSING

COVER

ROTOR

IDLER

IDLER PIN

SEAL

CAST
IRON

CAST
IRON

STEEL

IRON

HARDENED STEEL

MECHANICAL
CARBON RING
NI-REST OR
CERAMIC SEAL

Series 420 Pump Performance - 40 SSU
200 SSU, 500 SSU, 1000 SSU, 5000 SSU, 10000 SSU

40 SSU

0 PSI

50 PSI

100 PSI

Model
 RPM

GPM

HP

GPM

HP

GPM

HP

420

1200

1.9

1/4

1.7

1/4

1.5

1/3

1800

2.9

1/4

2.7

1/2

2.5

1/2

422

1200

3.7

1/2

3.4

1/2

3.1

3/4

1800

5.4

1/2

4.9

3/4

4.8

1

424

1200

9.0

1/4

7.6

3/4

6.0

1

1800

11.5

1/3

11.1

1

10.7

1.5

426

1200

10.0

3/4

8.2

1

6.3

1.5

1800

15.0

1

12.2

1.5

9.5

3

428

1200

20.9

3/4

17.4

1.5

14.0

3

1800

31.2

1.5

26.1

3

21.0

5

429

1200

34.0

1.5

29.0

3

22.0

5

1800

53.0

3

45.0

5

36.0

7.5

Series 420 Pump Performance - 200 SSU
40 SSU, 500 SSU, 1000 SSU, 5000 SSU, 10000 SSU

200 SSU

0 PSI

50 PSI

100 PSI

200 PSI

300 PSI

500 PSI

Model
 RPM

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

420

1200

1.9

1/8

1.9

1/8

1.7

1/4

1.5

1/3

1.4

1/2

1.2

3/4

1800

2.9

1/8

2.8

1/4

2.7

1/3

2.5

1/2

2.3

3/4

2.1

1.5

422

1200

3.7

1/8

3.4

1/4

3.1

1/4

2.8

1/2

3.0

1

2.8

1.5

1800

5.5

1/4

4.9

1/3

4.9

1/3

4.6

3/4

4.3

1.5

3.8

2

424

1200

9.0

1/3

8.6

1/2

8.6

1/2

7.7

2

7.1

3

-

-

1800

13.7

1/2

13.3

1

12.9

1.5

10.9

3

10.2

5

-

-

426

1200

12.0

3/4

11.0

1

10.5

1.5

-

-

-

-

-

-

1800

18.0

1

17.0

1.5

16.0

3

-

-

-

-

-

-

428

1200

24.5

3/4

23.8

1.5

23.0

3

-

-

-

-

-

-

1800

37.0

1.5

36.0

3

35.0

5

-

-

-

-

-

-

429

1200

41.0

1.5

40.0

3

38.5

5

-

-

-

-

-

-

1800

61.7

3

61.0

5

60.0

7.5

-

-

-

-

-

-

Series 420 Pump Performance - 500 SSU
40 SSU, 200 SSU, 1000 SSU, 5000 SSU, 10000 SSU

500 SSU

0 PSI

50 PSI

100 PSI

200 PSI

300 PSI

500 PSI

Model
 RPM

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

420

1200

1.8

1/8

1.8

1/8

1.7

1/4

1.6

1/3

1.4

1/2

1.1

1

1800

2.7

1/4

2.7

1/4

2.6

1/3

2.5

1/2

2.4

1

2.2

1.5

422

1200

3.6

1/8

3.5

1/4

3.3

1/3

2.8

1/2

2.7

3/4

2.0

1.5

1800

5.3

1/4

5/2

1/3

4/9

1/2

4.4

1

4.0

1.5

3.0

2

424

1200

8.7

1/2

8.6

3/4

8.5

1.5

8.2

2

7.8

3

-

-

1800

2.9

1

12.8

1.5

12.7

2

12.5

3

12.0

5

-

-

426

1200

12.0

1

11.5

1.5

11.0

2

-

-

-

-

-

-

1800

18.1

1.5

18.0

2

16.3

3

-

-

-

-

-

-

428

1200

24.5

1.5

24.0

2

23.7

3

-

-

-

-

-

-

1800

37.0

3

36.5

5

36.0

5

-

-

-

-

-

-

429

1200

41.0

2

40.0

5

39.5

5

-

-

-

-

-

-

1800

61.7

5

61.0

5

60.0

7.5

-

-

-

-

-

-

Series 420 Pump Performance - 1000 SSU
40 SSU, 200 SSU, 500 SSU, 5000 SSU, 10000 SSU

1000 SSU

0 PSI

50 PSI

100 PSI

200 PSI

300 PSI

500 PSI

Model
 RPM

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

420

1200

1.9

1/8

1.9

1/8

1.8

1.4

1.7

1/3

1.6

1/2

1.4

3/4

1800

2.8

1/4

2.7

1/4

2.7

1/4

2.6

1/2

2.5

3/4

2.2

1.5

422

1200

3.5

1/4

3.4

1/4

3.3

1/3

3.0

3/4

2.6

3/4

1.8

1.5

1800

5.0

1/3

4.9

1/2

4.9

3/4

4.7

1

4.2

1.5

3.4

2

424

1200

8.8

3/4

8.7

1

8.5

1.5

8.2

2

7.8

3

-

-

1800

13.0

1.5

12.7

2

12.5

2

10.2

3

9.9

5

-

-

426

1200

12.5

1.5

12.0

1.5

11.8

2

-

-

-

-

-

-

1800

18.7

2

18.5

2

17.0

3

-

-

-

-

-

-

428

1200

24.9

2

24.5

3

24.0

5

-

-

-

-

-

-

1800

37.4

5

37.2

5

36.5

5

-

-

-

-

-

-

429

1200

24.9

2

24.5

3

24.0

5

-

-

-

-

-

-

1800

37.4

5

37.2

5

36.5

5

-

-

-

-

-

-

Series 420 Pump Performance - 5000 SSU and 10000 SSU
40 SSU, 200 SSU, 500 SSU, 1000 SSU

5000 SSU

10000 SSU

0 PSI

50 PSI

100 PSI

200 PSI

300 PSI

0 PSI

50 PSI

100 PSI

Model
 RPM

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

GPM

HP

420

1200

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

1800

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

422

1200

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

1800

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

424

1200

8.2

1

8.0

1.5

7.8

2

7.6

3

7.4

3

-

-

-

-

-

-

1800

11.2

2

11.0

3

10.7

3

10.2

5

9.9

5

-

-

-

-

-

-

426

1200

12.5

2

12.4

2

11.6

3

-

-

-

-

-

-

-

-

-

-

1800

18.7

3

18.5

3

17.5

5

-

-

-

-

-

-

-

-

-

-

428

1200

24.9

5

24.9

5

24.5

5

-

-

-

-

23.3

5

23.0

5

22.8

5

1800

37.4

7.5

37.4

7.5

37.0

7.5

-

-

-

-

-

-

-

-

-

-

429

1200

41.7

5

41.0

5

40.0

7.5

-

-

-

-

-

-

-

-

-

-

1800

61.7

7.5

61.7

7.5

61.0

10

-

-

-

-

-

-

-

-

-

-

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Simplex, Inc., 5300 Rising Moon Road, Springfield, IL 62711-6228
800-637-8603 • 217-483-1600 (24 Hr.) • FAX 217-483-1616