Products
Metering Pumps
Process Pumps
Mixers
Systems & Skids
Electronics and Metering
Valves and Accessories
Industries & Applications
Water Treatment
Energy
Pyrolysis Plastics Recycling
Lithium Mining
Essential Pil Extraction
Palm Oil Production
Technology
Water Treatment
Energy
General Industry
Metering Pump Technology
Metering Pump Principles
Petrochemical Industry
Aftermarket & Support
CARE Maintenance Plans
Spare Parts Inventory
Resources
White Paper
Case Studies
Webinars on Demand
Digital Support Files
Certifications
Milton Roy YouTube Channel
Sales Terms & Conditions
About Us
News
Knowledge Hub
Careers
Sign Up for Newsletter
Back to the product list

MILROYAL® D Series

Hydraulically Actuated Diaphragm Metering Pumps

  • Maximum Flow Rate: up to 347 L/h 
  • Maximum Pressure: up to 500 kg/cm²g 
  • API 675 Compliant 
  • DSD Technology –HPD diaphragm – Metallic Diaphragm

High Accuracy Dosing for Critical Industrial Applications

API 675 | ATEX Compliant

Overview

Standard

  • Hydraulically actuated diaphragm design
  • Conforms to API 675 standard
  • Dosing accuracy: ±1% of rated flow from 10% to 100%
  • Flow rate adjustable while running or stopped: 0–100%
  • Stroke length at 100%: 25.4 mm
  • High thrust capability for stable operation
  • Excellent repeatability across the operating range
  • Designed for continuous industrial service
  • Ambient operating temperature: –10 °C to +50 °C

The MILROYAL D Series is available with multiple hydraulically actuated diaphragm technologies to suit different process requirements:

DSD® Technology (Dynamic Stiffness Diaphragm)

  • Ideal for precise, low to medium flow applications
  • Excellent control across varying pressures
  • Available with: 

HPD® Technology (High Performance Diaphragm)

  • Designed for higher flow rates and pressures
  • Superior diaphragm life under fluctuating process conditions
  • Available with metallic and plastic liquid ends

Metallic Diaphragm (High Pressure)

  • For very high pressure and critical applications
  • Metallic diaphragm ensures maximum safety and durability
  • Suitable for extremely demanding operating conditions

Depending on the selected configuration, wetted parts can be supplied in:

  • PVDF
  • 316L Stainless Steel
  • Hastelloy® and special alloys (on request)
  • Diaphragm materials, including PTFE, PEEK, and metallic diaphragms

This flexibility ensures excellent chemical compatibility across a wide range of aggressive and hazardous fluids.

  • Wide turndown capability with high dosing accuracy
  • Suitable for:
    • Low flow, high pressure applications
    • High viscosity fluids
    • Corrosive and hazardous chemicals
  • Single, duplex, and triplex pump configurations available

(Detailed performance tables are provided in the technical datasheet or on request)

Standard Motor Data

  • Power supply: 230/400 V or 415 V AC, 50 Hz, 3‑phase
  • Degree of protection: IP55
  • Insulation class: Class F
  • Motor speed: 1500 RPM
  • Enclosure: TEFC (Totally Enclosed Fan Cooled)

Motor & Drive Options

  • Variable frequency drives
  • Explosionproof / ATEX certified motors
  • Pneumatic or electric capacity control actuators

The MILROYAL D Series supports a wide range of control options, including:

  • Manual stroke length adjustment
  • Electric Actuator Capacity Controller (ACC)
  • Pneumatic actuators
  • Automatic capacity control systems
  • Integration with plant control systems

These options allow precise dosing control and seamless integration into automated processes.

A complete range of accessories is available to support safe and reliable operation, including:

  • Pulsation dampeners
  • Safety valves
  • Backpressure valves
  • Monitoring and protection accessories

Please consult us for accessory selection based on application requirements.

  • API 675 compliant
  • ATEX certified (Zone 1 & Zone 2 options available)
  • Designed to meet international industrial safety standards
Find a Sales Rep