mROY Series Metering Pump

Maximize uptime with unparalleled accuracy and reliability

Set global industry standards for critical process control

mROY series metering pumps control chemical dosing with unparalleled accuracy and reliability. The metering pump is durable and simple to design, ensuring steady-state accuracy of ± 1% over some hazardous chemicals.

Many mROY dosing pumps can operate for 20 years or more at design performance. Because mROY metering pumps have a unique set of unique technical parameters that provide consistent chemical dosing performance with minimal maintenance.

Flow rates range from 0.20 gallons per hour (0.8 liters per hour) to 174 gallons per hour (666 liters per hour), adding a wide range of chemicals to key processes such as chemical, municipal water and offshore platforms.


The enhanced mROY metering pump features improved component durability, it is easier to prime, it performs more efficiently and it is safer and simpler to maintain.

Accurate, repeatable flow control. The liquid end has been specifically designed for optimal chemical delivery. Available in metallic or non-metallic materials, the liquid end features a high-quality double ball check valve for repeatability and accuracy, micrometer capacity control for precise dosage adjustment, and a bleed system for safer maintenance and easier commissioning.

Rugged enclosure. Dust-tight, cast-iron drive housing with a high-quality chemical resistant coating provides a rugged enclosure for operation in any plant and field environment

Application flexibility. Available in simplex and duplex configurations with a wide range of options and accessories, you can customize mROY metering pumps for your most complex process needs.

Specifications and regulations. Our metering pumps meet all applicable regulations anywhere in the world where they operate. The Milton Roy mRoy pump also complies with API 675 specifications.


Performance by the numbers:


Because of its compact size, durable construction, and reliable performance, the mROY metering pump has applicability in a wide variety of applications.

The most common applications include the injection of chemicals such as coagulants, biocides, disinfectants, polymers, softening agents, acids and bases for pH control, scale and corrosion inhibitors, oxygen scavengers, process additives, and many more.

Water and wastewater treatment. Water and wastewater must be treated efficiently, cost-effectively and within the appropriate quality standards. Not only can mROY pumps effectively and safely deliver a wide range of chemical additives, they are well-known for their reliability. With preventative maintenance, these metering pumps can perform at peak levels for decades, leading to less shutdowns and long-term cost benefits.

Chemical and petrochemical processing. The durable design of the mROY pump enables it to effectively withstand the toxic nature of processing fluids while its flow control capability can endure temperature and pressure variations during production.

Oil and gas production. mROY pumps are ideal for onshore oil and natural gas production because it can consistently inject methanol, corrosion inhibitors, oxygen binders, and other corrosive substances in the harshest conditions in the most remote locations.

Other industries include