Overview
Milton Roy metering pumps are high-precision positive displacement pumps widely used in industries requiring accurate chemical dosing. Developed by the US-based Milton Roy Company (now part of Accudyne Industries), these pumps excel in repeatability, with typical accuracy of ±1%. They are engineered for harsh environments, featuring robust construction and compatibility with aggressive chemicals. Common series include the LMI, G Series, and Prominent, each catering to specific flow ranges and pressures. Their modular design allows customization for applications from laboratory-scale to heavy industrial use.
Structure and Working Principle
The pump consists of a drive mechanism (motor/cam assembly), fluid head, and control system. Most models use reciprocating diaphragm technology, where a motor-driven plunger deflects a PTFE or metal diaphragm to create suction/discharge cycles. Flow adjustment is achieved via stroke length modification or speed control. Advanced versions incorporate digital controllers with feedback loops for process automation. The patented Hydra-Cell design in some models eliminates check valves, reducing maintenance needs. Pulsation dampeners are often added for smoother flow in sensitive processes.
Key Features
1. Accuracy: Maintains ±1% setpoint even with viscosity/temperature changes. 2. Materials: Wetted parts available in 316SS, Hastelloy, or plastics for corrosion resistance. 3. Safety: Sealless designs prevent leakage of hazardous fluids. Models feature stroke frequency up to 300 RPM and turndown ratios up to 1000:1. Smart pumps integrate with SCADA via 4-20mA signals or Modbus. The patented ‘Dyna-Flo’ technology in G Series pumps reduces energy consumption by up to 30% compared to conventional designs.
Application Areas
Water Treatment: Chlorine/fluoride dosing in municipal plants. Oil & Gas: Methanol injection in pipelines. Chemical Processing: Catalyst addition in reactors. Other uses include pH adjustment in wastewater, nutrient dosing in biotech, and lubricant injection in manufacturing. The pharmaceutical industry employs sterilizable models for buffer preparation. High-pressure variants (to 350 bar) serve in reverse osmosis systems and boiler feed applications.
Maintenance and Precautions
Monthly inspections should check diaphragm integrity (replace every 12-24 months), valve seat wear, and lubrication. Always vent air from pump heads to prevent cavitation. For corrosive fluids, specify dual diaphragms with leak detection. Avoid running pumps dry – damage to seals and diaphragms may occur. Storage below -20°C requires glycerin filling to prevent PTFE cracking. Calibrate annually using a master meter for critical applications.
B2B Procurement Guide
Specify: 1) Flow range (max/min), 2) Pressure requirement, 3) Fluid properties (viscosity, abrasives), 4) Explosion-proof certifications if needed. Lead times for custom configurations average 6-8 weeks. Top suppliers include authorized distributors like IDEXX and specialty fluid system integrators. Consider total cost of ownership – premium materials (e.g., Hastellay) reduce long-term maintenance. Request factory test reports for high-accuracy applications. Leasing options exist for temporary projects.
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