DirectMaintenanceServices
24/7 Emergency
Free Pickup
Zero Leaks Guaranteed
Airlock leaking? Material bridging? Rotor jammed?
One call to D.M.S. - 24/7 emergency fleet dispatched anywhere in the USA. Free insured pickup. Live expert response in minutes.
(832) 860-5493
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D.M.S. is the nationwide leader in rotary airlock valve repair and full rebuilds - from 6" to 36"+, cast iron to stainless, abrasive-duty to FDA food-grade. We eliminate leaks, restore perfect clearances, and upgrade with hard chrome, tungsten carbide, ceramic coatings, and our famous outboard bearing retrofits - routinely delivering 5-10x longer life than new OEM valves.
Our step-by-step rigorous industrial rebuild process restores every critical dimension back to original factory specification.
Zero-cost insured transport
Digital report & CMM checks
Glass-bead & crack detection
Restore bore & clearances
Hard chrome & tungsten options
Outboard bearing installations
Air-purged seals & shaft truing
Set end gaps & verify 100% seal
From severe abrasive gouges to internal component failures, our machinists diagnose and correct the core causes of rotary valve breakdowns.
Signs: Grinding. Fix: CNC + Chrome.
Signs: Leaks, heat. Fix: Outboard retrofits.
Signs: Blow-by. Fix: Metal spray + CNC.
Signs: Jamming. Fix: PTFE non-stick coating.
Signs: No spin. Fix: Motor/Gearbox overhaul.
Signs: Vibration. Fix: Shaft truing or replace.
Signs: Pitting. Fix: SS overlay or Halar.
Signs: Rattling. Fix: Tip weld & replacement.
Extend the life of your equipment up to 10x with advanced thermal sprays, non-stick polymer barriers, and hard chrome plating.
Application: General Duty. Life: 3-5x. Hardness: 68-72 Rc.
Application: Abrasive (Cement, Fly Ash). Life: 8-12x. Hardness: 70+ Rc.
Application: Sticky Polymers. Life: 5-8x. Hardness: Non-stick.
Application: Food / Pharma. Life: FDA compliant. Hardness: Ra < 15.
Application: High Temperature. Life: Extreme heat. Hardness: >1000°F.
Application: Corrosive Chemicals. Life: Chemical resistant. Hardness: pH 1-14.
D.M.S. routinely overhauls and manufactures custom replacement components for all domestic and international rotary valve brands.
Specialized sealing and custom clearances configured for chemical, food, pet food, packaging, mineral, and heavy-duty utility industries.
Kiln feed, dust collection, pneumatic conveying
FDA-compliant, quick-clean, sanitary valves
Abrasive, corrosive, explosive media
Pellet conveying, regrind systems
Fly ash, biomass, coal handling
Clean-in-place, high-containment
Ore, concentrate, abrasive slurries
USDA & AAFCO compliant rebuilds
Wood chips, sawdust conveying, boiler ash handling.
Descaling systems, exhaust fans, furnace feed
Relocate critical bearing assemblies away from the path of active material flows to entirely eliminate contamination and wear.
Clean-in-place rail mounts, USDA-compliant hand-polished surfaces, and venturi vent upgrades built to minimize production downtime.
Our Stafford machine facility houses complete CNC boring, custom shaft turning, hard plating, and hydrostatic pressure test cells.
Every D.M.S. rotary airlock rebuild includes a 12-36 month warranty from date of installation - the longest, strongest coverage in the industry.
Answers to the most common operational, pressure seal, clearance tolerance, and thermal expansion questions.
Material leakage along the shaft is typically caused by worn packing or failed labyrinth seals. We resolve this by converting standard packing glands to air-purged shaft seals. By introducing a continuous stream of regulated compressed air into the seal chamber, we create a positive pressure boundary that prevents abrasive product from escaping and wearing down the shaft journals.
For standard ambient applications, we target a precise rotor-to-housing radial and end clearance of .003" to .005" (.079mm to .127mm). For high-temperature or steam-jacketed systems, clearances must be calculated and widened up to .008" to allow for thermal expansion of the rotor, preventing metal-on-metal contact and housing galling.
Yes. Inboard bearings place the bearing directly adjacent to the product stream, leading to premature bearing failure when seals leak. Our outboard bearing retrofit program involves machining custom endplate adapters to move the bearings away from the housing, creating a physical air gap. This completely eliminates product contamination and extends bearing life by 5-10x.
Sealed. Silent. Bulletproof.
Ready for a leak-free, 10x longer-life rotary airlock? We also overhaul connected drive systems, including Falk or SEW gearboxes and motor reducers.
(832) 860-5493
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Email: INFO@DIRECTMAINTENANCESERVICES.COM
