The G Series/MACROY G® metering pump is a mechanically actuated diaphragm pump designed for reliable chemical dosing in water treatment, industrial, and agricultural applications. It handles pressures up to 175 psi and flow rates up to 310 GPH, making it ideal for pH control, coagulation, and desalination. With a simple, compact design, corrosion-resistant housing, and high-efficiency motor, it ensures durability and performance. The pump offers flexible stroke adjustment, multiple frame sizes, and various liquid end options. NSF/ANSI 61 and 372 certified, it meets municipal compliance and safety standards.
Material (liquid end): PVDF / PVC / PP / 316SS / Acrylic
Pressure max: 150 psi / 10 bar (both metallic and plastic liquid end)
Flow max: 300 gph / 1,136 lph (both metallic and plastic liquid end)
Flow variation control: Manual / Remote
Certifications: API 675, ETL, NSF
Delivers flow rates up to 312 GPH (1180 L/hr), ensuring efficient liquid transfer for demanding applications.
Mechanically actuated PTFE diaphragm eliminates flow restrictions and reduces stress, extending service life.
Durable metallic housing and epoxy coating provide reliable operation in harsh environments.
Worm gear drive with variable eccentric stroke adjustment offers smooth operation, low pulsation, and a 10:1 turndown ratio.
High-performance check valves and precision stroke control ensure ±1% steady-state accuracy across operating range.
Oil-bath lubricated bronze gears and low-friction components minimize wear while supporting continuous performance.
Approximate for envelope estimations. Certified prints are available. Dimensions are showing for both D and G frame in inches.
NPT Connection Sizes
Frame | Liquid End Size | Connection Port Size for the Following Materials | ||||
|---|---|---|---|---|---|---|
Black PP, PVC PVDF & Acrylic | Applications | 316 SS | ||||
|
| HSO4 | ||||
G | 5 | 1/2" Female | ||||
6 & 7 | 1” Female | 1” Male | 1” Female | 1” Male | ||
| Domestic Box | Export box |
|---|---|---|
Simplex | 27x19x28 (686x483x711) | 39x23x31 (991x583x788) |
w/ECC | 36x28x30 (914x711x762) |
Ambient Temperature: Standard product suitable for temperature environments from 14° F (‐14° C) to 122° F (50° C). Pumps should be protected from direct sunlight exposure.
Description: Mechanically actuated diaphragm with suction and discharge single ball check valves.
Materials:
Connections:
Suction Pressure:
Discharge Pressure:
Liquid Temperature:
Relief Valve Settings:
Ball Check Configurations:
Pump Selection MacRoy | Maximum Ratings | ||||||
|---|---|---|---|---|---|---|---|
Capacity @ 60 Hz (1725 RPM) | Capacity @ 50 Hz (1425 RPM) | Pressure | |||||
Liquid End | Gear Code | GPH | Liter/Hr | GPH | Liter/Hr | PSI | Bar |
5 | 1 | 26 | 98.4 | 22 | 82 |
150 |
10 |
2 | 53 | 200.6 | 44 | 167 | |||
6 | 75 | 283.9 | 62 | 237 | |||
3 | 106 | 401.2 | 88 | 334 | |||
8 | - | - | 110 | 416 | |||
6 | 1 | 37 | 140.0 | 31 | 117 |
100 |
7 |
2 | 74 | 280.1 | 62 | 233 | |||
6 | 104 | 393.6 | 87 | 328 | |||
3 | 147 | 556.4 | 122 | 464 | |||
8 | - | - | 154 | 583 | |||
7 | 1 | 75 | 283.9 | 62 | 237 |
50 |
3.5 |
2 | 150 | 567.8 | 125 | 473 | |||
6 | 213 | 806.2 | 177 | 672 | |||
3 | 300 | 1135.5 | 250 | 946 | |||
8 | - | - | 312 | 1181 | |||
Ratings based on 1 HP (.75 kW)
MacRoy, Dependable and Versatile
The MacRoy™ series of pumps has proven its exceptional value over years of solid performance in a wide range of applications and industries. Water treatment chemicals, process additives, acids, out-gassing fluids, slurries, and many more applications are all handled with ease by this robust metering pump design. Your local representative can assist you in applying the MacRoy™ metering pump to your process.
Coagulation/flocculation (injection of ferric chloride, aluminium sulphate, etc.), pH regulation (injection of acids and alkalis), water conditioning before and/or after RO treatment in desalination plant
protection of installation such as boilers and hydraulic systems (corrosion inhibitors, biocides, scale inhibitors, amines…)
injection of additives, injection of co-catalyst, injection of sulphuric acid into water to produce diluted sulphuric acid
Injection of chemicals for separation and treatment of refined products, injection of paraffin inhibitor into fuel storage tanks
injection of biocide, corrosion/scale inhibitors, H2S scavengers… protecting piping and other assets and maintaining production rates, transfer of steam condensate
Injection of enzymes in starch production, injection of caustic soda for process water neutralization in refining and distilling applications
