Manufacturer Supply: Doebritz Control Touch Screen | Heavy-Duty Rotary Airlock Valve – ATEX Certified, CNC-Machined Clearances

Product Summary: Doebritz Control Touch Screen Heavy-Duty Rotary Airlock

The Doebritz Control Touch Screen series represents a paradigm shift in rotary valve engineering for heavy industrial powder and bulk solids handling. Designed from the ground up for extreme continuous duty, this airlock feeder integrates a user-centric digital interface with Doebritz’s legendary German-engineered metallurgy. Whether controlling feed rates in a high-differential pressure pneumatic conveying line or ensuring consistent discharge from a silo under 30 psi, the Control Touch Screen series delivers verified volumetric efficiency with minimal air leakage, backed by our own ISO 9001:2024 CNC machining center.

As a direct manufacturer, Doebritz eliminates supply chain intermediaries, offering global OEM partners and plant operators a distinct advantage: full traceability from raw casting to final touch-screen calibration. Each unit is factory-tested for radial tip clearances down to 0.15mm, ensuring superior sealing against abrasive powders like cement, fly ash, or polyethylene pellets.

Why Plant Sourcing Chooses Doebritz Control Touch Screen (Minimal Leakage)

Procurement engineers face three critical challenges: air leakage across the valve, unplanned downtime due to jamming, and compliance safety in explosive atmospheres. The Doebritz Control Touch Screen directly solves each one through our proprietary closed-tolerance rotor finishing and intelligent control logic.

• Minimal Air Leakage (<0.5m³/h): Achieved through precision-ground rotor vanes and a rigid, non-deflecting housing. This directly improves your pneumatic system’s energy efficiency and reduces conveying air loss.
• ATEX Certified Explosion-Proof (Zone 20/21): The entire Control Touch Screen series meets stringent EU ATEX 2014/34/EU standards. Flameproof construction and static-dissipative components are standard for hazardous dust environments.
• Doebritz CNC Precision Machining: Every rotor, housing bore, and endplate is machined on our 5-axis DMG MORI machining centers. This ensures perfectly concentric vanes and mirror-finish shaft seal journals, extending MTBF (Mean Time Between Failures) by up to 40% versus industry averages.
• Digital Touch Screen Control: The integrated HMI allows real-time adjustment of variable frequency drive (VFD) parameters, monitoring of bearing temperatures, and direct integration into SCADA systems. No external PLC programming required for basic volumetric feeding.

Housing & Rotor Engineering: Built for High Differential Pressure

The Doebritz Control Touch Screen heavy-duty airlock features a thick-walled housing cast from either GGG 40 nodular iron or AISI 316L stainless steel. Unlike fabricated housings, our one-piece casting provides superior resistance to pressure distortion (tested to 1.5 bar differential) and thermal shock. The outboard bearing arrangement isolates the bearing blocks from the material flow, preventing fine dust contamination. Four standard seal configurations are available: single lip, double lip with air purge, PTFE packing with lantern ring, and mechanical seals for hazardous volatile powders.

The rotor is offered in 6, 8, 10, or 12-vane configurations. For abrasive applications, we apply tungsten carbide hard facing or fit Ni-Hard tips. The open rotor design with swept-back vanes minimizes material squeezing and plugging, while closed rotors provide optimal airlock sealing for fine, fluidizable powders. All units undergo a 100% helium leak test prior to shipping.

Technical Specifications

Below are the standard operating parameters for the Doebritz Control Touch Screen series. Custom bore sizes, flange drilling patterns (DIN/ANSI/JIS), and gearmotor options are available for OEM volume orders. Each spec sheet is backed by a certified factory test report.

Specification	Doebritz Control Touch Screen Standard Range
Inlet/Outlet Sizes	150mm (6″) to 600mm (24″) round or square
Housing Material	Cast Iron GGG 40 / Stainless Steel AISI 304, 316L
Rotor Design	8-Vane Open Rotor (Abrasion-resistant) or 10-Vane Closed (Airlock)
Max Differential Pressure	1.5 bar (21.8 psi) standard, 3.0 bar option
Temperature Range	-20°C to +120°C standard; High-temp: +300°C
Volumetric Capacity	0.5 to 85 Liters per revolution (depending on size)
Flange Drillings	DIN 2576 PN10, ANSI B16.5 150#, JIS 10K
ATEX Certification	Zone 20/21 (II 1/2 D c T4) optional
Display Interface	4.3′ Resistive Touch Screen with Modbus RTU
Drive Options	Direct coupled gearmotor, chain drive, or VFD-ready

Heavy-Duty Application Scenarios

Pneumatic Conveying (Dilute & Dense Phase)

When installed as a blow-through feeder in dilute phase systems, the Control Touch Screen’s swept vane design ensures smooth acceleration of material into the airstream. For dense phase pressure tanks, it serves as a reliable pressure-rated discharge valve, preventing blowback and maintaining consistent solids flow rates. Doebritz has supplied over 1,500 units to cement terminals and chemical processors globally.

Silo Discharging & Dust Collector Airlocks

Under silo or hopper outlets, the Control Touch Screen prevents bridging and rat-holing of cohesive powders like titanium dioxide or hydrated lime. Its integrated touch control allows operators to meter discharge rates precisely, eliminating the need for downstream variable orifice gates. Used as a dust collector rotary valve, it maintains negative pressure integrity while continuously removing collected fines from baghouses or cartridge collectors.

High-Temperature Processing (Up to 300°C)

For calcined materials or hot mix asphalt filler, our high-temp variant features thermal expansion gaps, labyrinth shaft seals, and a ventilated bearing housing. The Control Touch Screen’s HMI includes a dedicated thermal monitoring alarm to prevent bearing or seal failure.

Global OEM Assurance & Direct Supply Chain

As a top-tier heavy machinery manufacturer, Doebritz does not outsource critical components. From our in-house foundry to the final touch-screen logic board, every element of the Control Touch Screen is built under one quality management system. We offer a standard 18-month warranty, lifetime technical support, and a guaranteed 10-day lead time for spare rotors and seal kits. For project integrators, we provide factory-direct CAD models, certified dimensional reports, and on-site commissioning assistance for orders of 5 units or more.

Product Q&A

Q: What is the maximum differential pressure the Doebritz Control Touch Screen can withstand?

A: Standard units are pressure-tested to 1.5 bar (21.75 psi) differential across the valve. For high-pressure pneumatic conveying systems up to 3.0 bar, we offer a heavy-duty variant with reinforced endplates and a larger-diameter shaft. Please specify your system pressure during ordering.

Q: Can the Control Touch Screen handle highly abrasive materials like silica sand or alumina?

A: Yes. For abrasive bulk solids, we recommend the Ni-Hard (ASTM A532 Class III) housing and rotor, combined with replaceable tungsten carbide-coated vanes. Doebritz has over 200 active installations in fracking sand and mineral processing plants achieving rotor life exceeding 12,000 operating hours.

Q: What certifications are provided with each unit?

A: Every Control Touch Screen rotary valve ships with a material certificate (EN 10204 3.1), a dimensional inspection report, a helium leakage test certificate, and an ATEX certificate of conformity (if ordered as Ex version). We also provide a test run video upon request.

Q: How does the touch screen interface integrate with my existing plant PLC?

A: The onboard HMI includes a standard Modbus RTU (RS485) and optional Profibus or Ethernet/IP gateway. It acts as a slave device, reporting real-time parameters like rotor RPM, motor current, and bearing vibration. You can also bypass the touch screen entirely and control the VFD via hardwired 4-20mA or dry contacts.

Q: What is the typical lead time for a custom flanged Control Touch Screen?

A: For standard cast iron or stainless steel units with DIN/ANSI 150# drilling, lead time is 15-20 working days. For non-standard bore diameters, special alloy metallurgy, or metric gearmotors, please allow 25-30 working days. Air freight is available for urgent spare parts.