Features & Benefits:

  • Available in 7 heights, from 7 3/8"H to 23 1/2"H; and 7 flange diameters from 4" to 16".
  • Valve housing cast in North America; ensures superior strength and solidification of housing's metallurgy.
  • CNC-machined components and housing provide precision tolerances; eliminates axial shaft movement, extends maintenance cycles.
  • Outboard bearing design protects bearings in high-temperature and high-PSIG applications; removes bearings from direct path of damaging contaminants.
  • Easily manages pressure differentials up to 15 PSIG; with super-duty series up to 22 PSIG.
  • Excellent performance in high-temperature applications up to 750°F.
  • Cast iron housing.
  • 8-vane rotor with beveled tips and sides.
What to do if your valve becomes uncompliant (Because it will)

Options:

  • 304 or 316 cast stainless steel valve housing.
  • RotorRail™ feature provides tool-less access to rotor and internal surfaces; speeds cleaning and inspection; ensures fast, accurate rotor and endplate re-alignment.
  • No. 4 finish on internal product contact surfaces of housing, and all rotor surfaces.
  • Interior coatings: hard chrome, tungsten, nickel, and epoxy.
  • Rotor types: closed-end, metering, shallow-pocket, adjustable-tip, and Teflon®-coated.
  • Adjustable rotor tip types: EPDM rubber, polyurethane, AR400, stainless steel, and bronze.
  • Shaft seal types: ACST-4™ glandless Teflon® shaft seal, and packing gland.
  • Valve housing vent ports.
  • Shaft seal and rotor pocket air purge.
  • 6-vane, 10-vane, or 12-vane rotor.
  • Custom drive packages.
  • Application-specific accessories: blow-through adapter, shear plate deflector, surge hopper, motion speed switch assembly.
Rotary Valve Capacity (Cubic Feet/Hr.)
Valve Size 4 2 8 12 15 18 21 24 27 30 33
6 6 30 48 60 72 84 96 108 120 132
8 12 60 96 120 144 168 192 216 240 264
10 24 120 192 240 288 336 384 432 480 528
12 45 225 360 450 540 630 720 810 900 990
14 66 330 528 660 792 924 1056 1188 1320 1452
16 84 420 672 840 1008 1176 1344 1512 1680 1848
1 5 8 10 12 14 16 18 20 22
Rotor Speed (RPM)

Customizations: MD Series

Rotors

Adjustable Polyurethane Tip Rotor Adjustable Polyurethane Tip Rotor Adjustable Rotor Adjustable Rotor Bolt-On Serrated Tips Rotor Bolt-On Serrated Tips Rotor Closed End Rotor Closed End Rotor Flex Tip Style Rotor Flex Tip Style Rotor Helical Metering Rotor Helical Metering Rotor Helical Rotor Helical Rotor Metering Rotor Metering Rotor Open End Rotor Open End Rotor Radius Pocket Rotor Radius Pocket Rotor Reduced Volume Rotor Reduced Volume Rotor Staggered Pocket Rotor Staggered Pocket Rotor

Kits

Combination Shaft Seal and Rotor Pocket Air Purge Kit Combination Shaft Seal and Rotor Pocket Air Purge Kit Rotor Pocket Air Purge Kit Rotor Pocket Air Purge Kit Shaft Guard Kit Shaft Guard Kit Shaft Seal Air Purge Kit Shaft Seal Air Purge Kit Zero Speed Switch Kit Zero Speed Switch Kit

Accessories

Discharge Blow-Through Adapter for Round Valves Discharge Blow-Through Adapter for Round Valves Discharge Finger Guard for Round Valves Discharge Finger Guard for Round Valves Inlet Shear Protector: Half-moon Style for Round Valves Inlet Shear Protector: Half-moon Style for Round Valves Inlet Shear Protector: Spool Style for Round Valves Inlet Shear Protector: Spool Style for Round Valves Inlet Shear Protector: Spool Style for Round Valves, Vented Inlet Shear Protector: Spool Style for Round Valves, Vented Inlet Shunt with Tip Cleaner for Round Valves Inlet Shunt with Tip Cleaner for Round Valves Maintenance Slide Gate for Round Valves (Air Operated) Maintenance Slide Gate for Round Valves (Air Operated) Maintenance Slide Gate for Round Valves (Manually Operated) Maintenance Slide Gate for Round Valves (Manually Operated) Vent Box for Round Valves Vent Box for Round Valves

Specifications

Inlet/Outlet Flange Sizes: 7 sizes from 4" to 16"
Material of Construction: Cast Iron, Stainless Steel
Pressure Differential: Up to 22 PSIG
High Temperature Range: 750°F
Industries
Systems
Types

Videos

Why is rotor maintenance so important?
Why is rotor maintenance so important?

Rotor tips wear down over time, causing issues with material flow. Our video illustrates why rotor maintenance is so critical to the overall efficiency of your rotary airlock valve.
A 3D view of material flow in an MD Series rotary airlock valve
A 3D view of material flow in an MD Series rotary airlock valve

Watch a quick 3D demonstration of material flow and pocket fill in an MD series rotary airlock valve. The video is silent.
Ordering valves from ACS: How does it work?
Ordering valves from ACS: How does it work?

It's easy to order a new valve from ACS and have it get to you. Here's how the process works from start to finish.
Drive Side Endplate Removal for ACST-4 Seals
Drive Side Endplate Removal for ACST-4 Seals

Need a guide to removing the drive side endplate on your ACST-4 seals? Watch a quick visual breakdown of the process. The video is silent.
Rotor Assembly Tolerance Check
Rotor Assembly Tolerance Check

Keep valves compliant by ensuring rotor-to-housing clearance stays below 0.0079.
What you need to know about DHAs and NFPA 652
What you need to know about DHAs and NFPA 652

Every material is different, so every valve has to be designed to handle each combustible dust in order to prevent deflagration.
Yes, you have to remove our endplates to replace the shaft seal
Yes, you have to remove our endplates to replace the shaft seal

We're facing our critics head on.
Understanding Airlocks: The key to increasing ROI
Understanding Airlocks: The key to increasing ROI

Learn the fundamentals of airlock performance, how to minimize air leakage and how improve efficiency.
Why you can't afford an unreliable valve
Why you can't afford an unreliable valve

Choosing the right rotary valve can improve your productivity. Choosing the wrong one can do the opposite.
Explore in our 3D gallery.
CI valves with ruler lines.
Try the valve sizing tool

Brochures

The ACS MD Series Valve: no more fitting squares into circles

The ACS MD Series Valve: no more fitting squares into circles

Put your own spin on the completely customizable MD Series valve. With an endless combination of adjustable features, and a universal ANSI class 150 flange bolt pattern, this valve is perfect for industries requiring round flange outlets.

This link opens in a new tab View

Related Valves

CI Series CI Series Rotary Valve for Metering, Feeding and Airlock Applications

The CI Series rotary valves are also available in sanitary 304 or 316 cast stainless steel models. Sanitary CI Series models also offer the ACS RotorRail quick-clean feature.

Read more XTR-CI Series XTR-CI Series Corrosion-resistant Rotary Valve for Abrasive or Acidic Materials

The XTR-CI Series valve boasts high corrosion resistance with the same efficient, high-performance design of our popular square-flange CI Series rotary valve. It is specially outfitted to excel in any pressure pneumatic conveying system that requires food-grade product contact.

Read more MD with Quick-Clean RotorRail™ MD with Quick-Clean RotorRail™ Rotary Valve for Metering, Feeding and Airlock Applications

Tool-less, single-step access to rotor and internal surfaces; simplifying cleaning, validation, and inspection.

Read more XTR-MD Series XTR-MD Series Corrosion-resistant Rotary Valve for Abrasive or Acidic Materials

The XTR-MD Series valve boasts high corrosion resistance with the same efficient, high-performance design of our popular round-flange MD Series rotary valve. It is specially outfitted to excel in any pressure pneumatic conveying system that requires food-grade product contact.

Read more CDC-CI Series CDC-CI Series Rotary Valve for Metering, Feeding and Airlock Applications Read more