Where Are Milton Roy Pumps From? Brand Background and the LMI Connection

Open a Chinese-language Milton Roy brochure and there's a line of small print under the logo in the top corner: An Ingersoll Rand Business. When people ask where a Milton Roy pump comes from, the answer is right there. Milton Roy is an American metering pump brand, now part of the Ingersoll Rand group.

Still, "which country's brand" and "where it's made" aren't quite the same question, and the LMI brand under the same roof confuses people too.

Which Country Is the Milton Roy Pump Brand From?

The Milton Roy pump brand is American, full name Milton Roy, LLC, and its brochures carry the slogan "inventor of the world's first metering pump." The Milton Roy pump range covers mechanical diaphragm, hydraulic diaphragm and plunger designs, from water treatment dosing to high-pressure injection in petrochemicals and oil and gas. The G series brochure lists municipal, industrial water and wastewater, and pools as the main applications. API675 series like Primeroyal and Milroyal are used more in petrochemicals, oil and gas, and power.

Ownership has changed over the years. A 2015 Primeroyal PN English data sheet we have says "an Accudyne Industries brand" in the footer. Chinese brochures from 2021 onward switch to Ingersoll Rand. Ingersoll Rand is listed on the NYSE, and the brochure says it owns more than 40 brands, with products including air compressors, pumps and blowers.

Who Actually Manufactures a Milton Roy Pump?

The Chinese-language Milton Roy pump brochures seen in China are almost all issued by Milton Roy's Shanghai company. The G series brochure even states that its model code applies to G series pumps manufactured by that Shanghai company.

In other words, under the same Milton Roy name, some series are built in China and some are factory products from overseas. Primeroyal literature includes notes like "NX type (imported from France)." If your project has an origin requirement, such as fully imported equipment, get written confirmation of the origin for the specific Milton Roy pump model from your supplier before ordering.

How Milton Roy and LMI Are Related

LMI is Milton Roy's solenoid metering pump brand. LMI data sheets carry a Milton Roy, LLC copyright, EXCEL is a Milton Roy registered trademark, and LMI's Chinese data sheets print Milton Roy China's website in the footer.

LMI's own catalog says it has been in the metering pump business for more than 40 years and was first to offer a full line of electronic metering pumps and accessories, with black and yellow as its signature colors. The listed applications center on water treatment but also cover chemicals, food and beverage, oil and gas, power, paper and textiles.

How the two product lines split the work

The easy way to remember it: low-flow solenoid pumps come from LMI, medium to high flow and high pressure come from Milton Roy.

• LMI: P+, PD, C, B, D and EXCEL AD, solenoid-driven diaphragm pumps for low-flow water treatment dosing;
• LMI: SD, SG and EXCEL XR, motor-driven diaphragm pumps with more flow;
• Milton Roy: G series and the SDP smart digital series, mechanical diaphragm pumps up to 1800 L/h;
• Milton Roy: mRoy, Milroyal and Primeroyal, hydraulic diaphragm and plunger pumps for high pressure and process dosing.

That's only the general direction. The two lines overlap between a few tens and a few hundred liters per hour, so check the data sheet for each series.

How to Check That a Milton Roy Pump Is Genuine

Behind the "where is it from" question there's often a worry about buying grey-market or questionable stock. We usually suggest these checks:

1. Confirm the Milton Roy pump nameplate model follows the brochure's coding rules. A G series pump should start with GM or GB followed by four flow digits.
2. Ask the supplier for the brochure or data sheet for that series, and make sure the specs match.
3. Check the supplied accessories. Per the brochure, low-flow G series pumps with PVC/PVDF heads should come with an injection valve, foot valve, weight and 6 m of tubing.
4. For larger projects, ask for a certificate of conformity and factory test records.

These steps take little time but screen out most questionable stock. If a model doesn't fit the coding rules, ask more questions. The same goes for LMI pumps. Every position in the model code means something, and control method, flow, voltage and liquid end can all be read from it. If they don't add up, get the supplier to explain.

Milton Roy or a Local Brand?

There's no one right answer. A Milton Roy pump has the advantage of a complete range, many API675 high-pressure models and thorough documentation. Local brands are often more flexible on lead time and local service, and spares are easier to find.

Before comparing a Milton Roy pump with anything else, pin down the duty first: flow, pressure, chemical and control method. For routine low-flow dosing, both local and imported brands have suitable options. For API675 certification and injection at hundreds of bar, the field narrows a lot and brands like Milton Roy have a clearer edge.

Conclusion

Where is a Milton Roy pump from? It's an American brand, now owned by Ingersoll Rand. In China it's handled by Milton Roy's Shanghai company, with some series built locally and others imported from the original factories. LMI is Milton Roy's solenoid pump brand, covering low flow while Milton Roy covers medium to high flow and high pressure. When buying, confirm origin and documentation by model rather than relying on the brand name alone.

FAQ

Is an LMI pump the same quality as a Milton Roy pump?

They're positioned differently, so there's no simple ranking. LMI focuses on low-flow solenoid pumps and Milton Roy on mechanical and hydraulic diaphragm pumps. Choose by duty.

Is a Milton Roy pump made in China still genuine?

Pumps built by Milton Roy's Shanghai company and shipped under the original coding system are part of the official Milton Roy line. Only the place of manufacture differs.

Did Milton Roy belong to a different group before?

Yes. 2015 data sheets show Accudyne Industries, and recent literature has switched to Ingersoll Rand.

How can I tell which year's model an old pump is?

Read the full model on the nameplate and compare it with that year's brochure. Specs within a series can change between years. The maximum fluid temperature on the G series, for example, differs between old and new editions.

What flow range do LMI solenoid pumps cover?

Per the literature, the P+ reaches 15.1 L/h, the PD about 7.6 L/h, the C series around 95 L/h and the D series 90 L/h.

To confirm the specs and suitable duties for a particular Milton Roy or LMI model, send the nameplate or quote through our contact page and we'll check it with you.