GAS SAFETY TRAINS, SOLENOID VALVES AND BURNER MANAGEMENT SYSTEMS
DUNGS Gas Control & Safety Combustion Equipment: GasMultiBloc, Valves and Pressure Switches
We supply engineered gas equipment and combustion safety hardware manufactured by Karl Dungs GmbH & Co. KG for industrial burners, boiler rooms, rotary kilns, asphalt drying plants, and metallurgical heat-treatment furnaces. Our engineering team calculates flow coefficients, pipe sizing, and manifold pressure losses, outfitting forced-draft gas trains for burners by Weishaupt, Riello, Oilon, and Elco with direct factory-sourced assemblies and original replacement components.
DUNGS Industrial Combustion & Gas Equipment Portfolio
Select the required DUNGS gas valve series or safety control device for your boiler plant, thermal furnace, or HVAC installation. Attach your gas piping P&ID schematics, burner specification, or maintenance overhaul parts list.
DUNGS GasMultiBloc MB-D, MB-DLE, MB-ZRDLE & MB-VEF Integrated Gas Trains
DUNGS GasMultiBloc MB-D, MB-DLE, MB-ZRDLE, and MB-VEF series integrated gas trains consolidate a fine mesh filter, a direct-acting servo-stabilized pressure regulator, two Class A high-integrity safety shutoff solenoid valves, and an inlet gas pressure switch into a compact aluminum body.
Engineered for automated forced-draft gas and dual-fuel burners by Weishaupt, Riello, Oilon, and Elco across industrial steam boilers, district heating stations, and thermal process furnaces.
Selection criteria: connection size (Rp 3/8 to DN 100 flanged), inlet pressure rating (up to 360 mbar), and regulation mode (single-stage, two-stage, or pneumatic VEF ratio).
DUNGS DMV-D, DMV-DLE, and DMV-SE double solenoid valves integrate two independent Class A Group 2 safety shutoff valves into a space-saving single casting per EN 161 standards.
Rated for operating gas pressures up to 500 mbar, they ensure instantaneous leak-tight fuel isolation during routine cycle shutdowns, emergency interlocks, or boiler plant power supply failures across modern utility and process installations.
Selection criteria: threaded (DMV 503–525/11) or flanged (DMV 5040–5125/11), opening speed (fast-opening D or soft-opening DLE with adjustable brake), and coil voltage.
DUNGS MVD and MVDLE automatic single-stage solenoid safety valves operate as normally closed direct-acting isolation devices for natural gas, liquid petroleum gas, and biogas lines.
The MVDLE variant incorporates an adjustable hydraulic damper providing smooth opening times up to 20 seconds, eliminating pressure surges and combustion rumble during initial ignition sequences of large industrial drying plants and annealing furnaces.
Selection criteria: nominal pipe size from Rp 3/8 up to DN 200, pressure rating (200, 360, or 500 mbar), ATEX compliance, and closed-position limit switch options.
DUNGS GW A6, LGW A2, LGW A4 & NB/UB Precision Gas & Air Pressure Switches
DUNGS GW A6 diaphragm gas pressure switches and LGW A2/A4 differential pressure switches are engineered to monitor combustion air supply, flue gas draft, and gas manifold minimum and maximum pressure thresholds.
Featuring an intuitive adjustment dial with calibrated numerical scale, they allow exact trip setpoint tuning on-site without requiring supplementary manometer instrumentation.
Selection criteria: adjustment range (GW 3, GW 10, GW 50, GW 150, GW 500 A6), medium compatibility, and manual reset lock-out requirements (NB/UB limiters per EN 1854).
DUNGS VPS 504 S02 and VPS 504 S04 automatic valve proving systems conduct fully autonomous leak detection routines across dual shutoff solenoid valve seats prior to burner startup sequences.
An internal motorized mini-pump pressurizes the intermediate test chamber above line pressure, ensuring ultra-sensitive leak identification completely independent of fluctuations in supply line gas pressures.
Selection criteria: supply voltage (230 VAC or 24 VDC), test volume capacity (up to 4.0 liters for VPS 504), and dedicated mounting adapter kit for DMV or MB valve bodies.
DUNGS FRS Direct-Acting Gas Pressure Regulators & FRNG Zero-Pressure Ratio Regulators
DUNGS FRS series spring-loaded direct-acting gas pressure regulators feature internal inlet pressure compensation diaphragms to maintain precise outlet manifold pressure despite large upstream pressure swings.
The companion FRNG zero-pressure regulators deliver accurate 1:1 air-gas ratio control tailored for modulating premix surface burners and reciprocating gas engine cogeneration packages.
Selection criteria: size range from Rp 3/8 to DN 150 flanged, max inlet pressure 500 mbar, outlet pressure spring selection (2.5 to 200 mbar), and rated capacity in Nm³/h.
DUNGS MPA 4111, 4112 & 4122 Microprocessor Burner Management Systems
DUNGS MPA 4111, MPA 4112, and MPA 4122 microprocessor-based burner management controllers execute automated pre-purge routines, ignition timing, and continuous flame supervision for single-stage, multi-stage, and modulating burners.
Supporting ionization rods, optical UV flame detectors, multi-actuator electronic air-fuel ratio servos, and industrial fieldbus communication via e-BUS and Modbus protocols.
Selection criteria: control sequence logic (stage vs modulating), flame sensor type (ionization or UV), safety interlock response timing, and building automation interface.
DUNGS GF Fine Gas Filters, DMK Butterfly Throttle Valves & Burner Train Accessories
DUNGS GF 505–520 and GF 40040–40100 series fine gas filters provide effective separation of dust, rust, and particulate contaminants down to 50 microns, safeguarding delicate valve seats and meters from erosion and jamming.
Complementary train hardware includes DMK motorized butterfly control valves for linear flow throttling, pressure gauge test points, and original replacement magnetic solenoid coils rated IP54/IP65.
Selection criteria: filter port size (Rp 1/2 to DN 100 flanged), retention rating (standard 50 µm fleece), and solenoid coil voltage rating (230 VAC, 110 VAC, or 24 VDC).
Modular Architecture of GasMultiBloc and Footprint Optimization
Integrating a strainer, a high-precision pressure regulator, and two Class A safety shutoff valves into a single GasMultiBloc aluminum casting reduces overall gas train physical footprint by more than 50% compared to discrete flanged pipe assemblies.
Eliminating intermediate flanged joints drastically decreases potential gas leak leakage paths within confined boiler rooms, simplifies scheduled maintenance, and lowers internal fluid pressure drops.
The integrated direct-acting regulator maintains exceptional manifold pressure stability across modulating burner turndown ratios, delivering precise air-fuel stoichiometry, optimizing combustion efficiency, and minimizing unburned hydrocarbon and NOx emissions.
Autonomous VPS 504 Valve Proving Logic and Explosion Prevention
In compliance with international standard EN 676 and stringent industrial safety regulations for fuel gas combustion systems, forced-draft burners with ratings exceeding 1200 kW must incorporate automatic valve proving systems.
The DUNGS VPS 504 executes this safety cycle autonomously: an integrated motorized pump pressurizes the intermediate chamber between the safety valves above supply line pressure, while a sensitive differential diaphragm switch tracks pressure decay.
Any detected valve seat leakage triggers an immediate lockout interlock on the burner programmer, preventing hazardous buildup of unignited fuel gas mixtures inside the boiler furnace chamber.
Continuous Firing Turndown and VEF Pneumatic Air-Fuel Ratio Control
In modern modulating burners for power boilers and process furnaces, maintaining exact excess air coefficients across operating turndowns from 10% to 100% is essential.
GasMultiBloc MB-VEF assemblies and FRNG ratio regulators utilize combustion air pressure signals from the burner blower as a pilot reference to govern gas output. Pneumatic or electronic cross-limiting servo feedback dynamically modulates gas delivery in tandem with air damper positions.
This prevents flame liftoff at low fire and eliminates carbon monoxide formation during sudden high-fire thermal surges.
Compliance with EN 161, EN 298 and Extreme Duty Industrial Engineering
All Karl Dungs gas components are engineered with heavy-duty safety margins and undergo 100% computerized leak-tightness and functional testing prior to dispatch.
Valve castings are precision-molded from corrosion-resistant aluminum alloys compatible with clean dry or moist fuel gases, while solenoid coils are encapsulated in durable epoxy compounds rated IP54 or IP65.
Designed to operate reliably across ambient temperatures from -15 °C to +60 °C (with arctic low-temperature variants down to -40 °C), DUNGS components endure millions of switching cycles in demanding utility, district heating, and metallurgical applications.
Baseline Technical Criteria for DUNGS Equipment Selection
To guarantee correct gas train dimensioning, please provide burner thermal firing capacity (kW/MW), maximum gas volumetric flow in normal cubic meters per hour, supply line pressure fluctuations (mbar), specific gas density and composition (natural gas, propane, LPG, biogas with H2S trace), piping nominal diameter, and desired staging control philosophy.
Original DUNGS Replacement Coils, Diaphragms & Maintenance Kits
We supply authentic Mag.Nr. replacement solenoid magnetic coils (230 VAC, 115 VAC, and 24 VDC), bridge rectifiers, selectable range calibration springs for FRS regulators, polypropylene fleece filter cartridges for GF units, high-grade NBR and Viton valve seat seals, and complete service rebuild kits for VPS 504 valve proving controllers.
Submit Technical Specification for DUNGS Gas Systems
Upload your engineering specification, boiler modernization project scope, or component replacement bill of materials. Our technical sales engineers will prepare a detailed commercial proposal with manufacturer part numbers, verified lead times, and comprehensive product data sheets.
