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Accurate Flow Control with mRoy MRB Series | Milton Roy

The mROY Model B metering pump ensures precise, controlled chemical dosing with a hydraulically-actuated PTFE diaphragm. Its compact, durable design meets global standards and delivers reliable, year-round performance. With minimal maintenance, it provides decades of accuracy for a wide range of fluid applications.

  • Material (liquid end): 316SS / Alloy 20 / Alloy C22 / Titanium / PVC / PVDF
  • Pressure max: 3000 psi / 206.9 bar (metallic liquid end); 150.3 psi / 10 bar (plastic liquid end)
  • Flow max: 85 gph / 321.7 lph (metallic or plastic liquid end)
  • Multiplex: Duplex only
  • Flow variation control: Manual / Remote
  • Certifications: API 675, ATEX

PTFE Diaphragm Durability

Hydraulically balanced diaphragm rated for up to 96,000 hours, eliminating seals and reducing maintenance needs.

Maintenance-Free Design

No plunger packing required, minimizing downtime and lowering long-term service costs.

Easy Commissioning

Integrated liquid end bleed system simplifies startup and ensures smooth operation from day one.

Robust Drive System

Worm and pinion mechanism in an oil bath delivers smooth motion and extends gear and bearing life.

Heavy-Duty Housing

Dust-tight cast iron construction protects internal components in demanding environments.

Precise Flow Control

Micrometer capacity adjustment enables accurate and consistent dosing performance.

Overpressure Protection

Built-in hydraulic relief valve safeguards the system against excess pressure.

Reliable Check Valves

Adjustable cartridge-type valves ensure tight sealing and dependable operation on every stroke.

Wide Application Range

Ideal for chemical dosing across water treatment, oil & gas, power generation, pharmaceuticals, and more.

mROY® Model B - Metallic Liquid Ends

 

Plunger

Gear Ratio Code 

Stroke/Minute

Capacity/Pressure @ 60 hz 1725 RPM

Capacity/Pressure @ 50 hz 1425 RPM

Ratings at 100 psi/7 bar

Capacity at Max pressure

Ratings at 100 psi/7 bar

Capacity at Max pressure

Diameter

Code

60 hz
1725 rpm 

50 hz
1425 rpm 

Capacity

Max Pressure

Capacity

Max Pressure

gph

l/hr

gph

l/hr

psi

bar

gph

l/hr

gph

l/hr

psi

bar

19/32 in
15.1 mm

K

38

48

40

4.7

17.8

3.3

12.5

1,500

103.4

3.92

14.8

2.75

10.4

1,500

103.4

25

72

60

7

26.5

5.6

21.2

1,500

103.4

5.83

22.1

4.67

17.7

1,500

103.4

19

96

80

9.5

36

7.1

26.9

1,500

103.4

7.92

30

5.92

22.4

1,500

103.4

12

144

120

13.3

50.3

11.4

43.1

1,500

103.4

11.08

41.9

9.50

36

1,500

103.4

10

-

148

-

-

-

-

1,500

103.4

13.67

51.7

11.72

44.3

1,500

103.4

7/8 in
22.2 mm 

L

38

48

40

10

37.9

37.9

4.7

1,000

69

8.33

31.5

3.92

14.8

1,000

69

25

72

60

16

60.6

60.6

11

1,000

69

13.33

50.5

9.17

34.7

1,000

69

19

96

80

21

79.5

79.5

16

1,000

69

17.5

66.2

13.33

50.5

1,000

69

12

144

120

30.4

115.1

115.1

25.6

1,000

69

25.33

95.9

21.33

80.7

1,000

69

10

-

148

-

-

-

-

1,000

69

31.24

118.2

26.31

99.6

1,000

69

1-7/16 in
36.5 mm 

R

38

48

40

27

102.2

21

79.5

400

27.6

22.5

85.2

17.50

66.2

400

27.6

25

72

60

42

159

36

136.3

400

27.6

35

132.5

30.00

113.6

400

27.6

19

96

80

57

215.7

51

193

400

27.6

47.5

179.8

42.50

160.9

400

27.6

12

144

120

85

321.7

79

299

400

27.6

70.83

268.1

65.83

249.2

400

27.6

10

-

148

-

-

-

-

400

27.6

87.357

330.6

81.19

307.3

400

27.6

Capacities shown are for simplex. Double capacity for duplex

Certain options may slightly alter the capacity or pressure ratings shown above.

mROY Model B - Plastic Liquid Ends

 

Plunger

Gear Ratio Code 

Stroke/Minute

Capacity/Pressure @ 60 hz 1725 RPM

Capacity/Pressure @ 50 hz 1425 RPM

Ratings at 100 psi/7 bar

Capacity at Max pressure

Ratings at 100 psi/7 bar

Capacity at Max pressure

Diameter

Code

60 hz
1725 rpm 

50 hz
1425 rpm 

Capacity

Max Pressure

Capacity

Max Pressure

gph

l/hr

gph

l/hr

psi

bar

gph

l/hr

gph

l/hr

psi

bar

7/8 in
22.2 mm 

L

38

48

40

10.0

37.9

9.7

36.7

150

10.3

8.33

31.5

8.1

30.6

150

10.3

25

72

60

16.0

60.6

15.7

59.4

150

10.3

13.33

50.5

13.1

49.5

150

10.3

19

96

80

21.0

79.5

20.7

78.3

150

10.3

17.50

66.2

17.3

65.3

150

10.3

12

144

120

30.4

115.1

30.1

113.9

150

10.3

25.33

95.9

25.1

94.9

150

10.3

10

-

148

-

-

-

-

150

10.3

31.24

118.2 

30.93

117.1

150

10.3

1-7/16 in
36.5 mm 

R

38

48

40

27.0

102.2

26.0

98.4

150

10.3

22.50

85.2

21.7

82.0

150

10.3

25

72

60

42.0

159

41.0

155.2

150

10.3

35.00

132.5

34.2

129.3

150

10.3

19

96

80

57.0

215.7

56.0

212

150

10.3

47.50

179.8

46.7

176.6

150

10.3

12

144

120

85.0

321.7

84.0 

317.9

150

10.3

70.83

268.1

70.0

265.0

150

10.3

10

-

148

-

-

-

-

150

10.3

87.36

330.6

70.0

326.8

150

10.3

Includes PVC, PVDF liquid ends, and liquid ends for fluoride applications

Capacities shown are for simplex. Double capacity for duplex

Certain options may slightly alter the capacity or pressure ratings shown above.

Power Requirements

 

mRoy® Frame

B

Plunger Code

K

L

R

<1,000 psi/67 bar

 >1,000 psi/67 bar

<400 psi/28 bar

>400 psi/28 bar

<100 psi/7 bar

>100 psi/7 bar

1 Ph

Simplex

3/4 HP (0.55 kW)

1 HP (0.75 kW)

3/4 HP (0.55 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

Duplex 

1 HP (0.75 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

3 Ph

Simplex

1/2 HP (0.37 kW)

3/4 HP (0.55 kW)

1/2 HP (0.37 kW)

3/4 HP (0.55 kW)

3/4 HP (0.55 kW)

3/4 HP (0.55 kW)

Duplex 

3/4 HP (0.55 kW)

1 HP (0.75 kW)

3/4 HP (0.55 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

1 HP (0.75 kW)

 

Connect With Our Experts

We will help you to identify the right solution for your application, operating conditions and performance requirements

Model B

Dimensions are provided for pump envelope estimates with basic options.  

Drawings are available for the exact configuration required.

mroy-mrb-image-dimension

mRoy Data Sheet.pdf

4.2 MB, PDF
Download

54814_EN (1).pdf

542 KB, PDF
Download

MR_ENG_54649.pdf

14 MB, PDF
Download

54649 Global mRoy A&B Manual.pdf

17 MB, PDF
Download

IOM_ACC-_1602101001_EN.pdf

1.1 MB, PDF
Download

53867 - mROY Diaphragm Rupture Detection.pdf

623 KB, PDF
Download

53870_Electronic-Capacity-Control.pdf

3.5 MB, PDF
Download

339-0077-000-Metallic-Diaphragm-Liquid-End IOM (1).pdf

584 KB, PDF
Download

53871_mROY-Pneumatic-Capacity-Control IOM.pdf

2.1 MB, PDF
Download

MR-En-Brochure-chemical-metering-pump-mroy-series.pdf

5.1 MB, PDF
Download

MR-En-Brochure-global-water-brochure.pdf

3.8 MB, PDF
Download

Milton Roy, mROY Chemical Metering Pump

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