Double solenoid valve Combined pressure regulator and safety valves Servo pressure regulator MBC-...-SE DN 65 - DN 100

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1 Double solenoid valve Combined pressure regulator and safety valves Servo pressure regulator MBC-...-SE DN 5 - DN Printed in Germany Edition 0. Nr. Technical Description The DUNGS multiple actuator MBC-...-SE integrates valves and servo pressure regulator in one compact unit: - Solenoid valves up to mbar (50 kpa) as per DIN EN Class A Group - Fine setting of outlet pressure - Servo pressure regulator unit as per DIN EN Class A Group - Setpoint spring replaced - Outlet pressure: - 00 mbar ( kpa) - Internal stepping lines for optimised outlet pressure stability, external as an option. - Flange connection as per EN Easy to install - Low weight As this system has a modular design, we can offer individual solutions with valve testing system, mini/maxi pressure switch and pressure limiter. Despite the compact design, high flow rates can be achieved at low pressure difference. Application The servo pressure regulator permits optimal mixture formation in forced air burners and premix burners in combination with mechanical or electronic gas/air regulation units. This applies to modulating and multistage variable operating modes. Suitable for gases belonging to gas families,, and other inert gaseous media. Approvals EC type testing certificate as per: EC-Gas Appliances Regulation EC-Pressure Equipment Directive Approvals in other important gas-consuming countries.

2 Functional Description Gas flow. If the valves V and V are closed, chamber a is subjected to inlet pressure up to the double seat of the valve V.. The min. pressure switch (option) is connected to chamber a via a bore hole. If the inlet pressure exceeds the desired value set on the pressure switch, the pressure switch connects through to the gas burner control system.. The valves V and V open after they are enabled by the gas burner control system. Gas flow through chambers a, b and c is enabled. Functional description of the combined valve-regulator unit at valve V A regulator (pressure regulator unit) with admission pressure compensation is integrated in valve V. The plunger V is not connected to the valve disc unit. When the plunger opens, it preloads the compression spring and releases the regulator unit. When the plunger closes, the closing pressure is applied directly to the valve discs of the regulator unit. Valves V and V are driven together electrically. When valve V is in the closed position, it closes off the pressure chamber under the working diaphragm M so that this chamber is not affected by the inlet pressure p in chamber a. The plunger of valve V controls the valve V. The pressure under the working diaphragm M depends on a variable flow cross-section D. The outlet pressure p Br counters the force of the setting spring E via the servo diaphragm S until an equilibrium of forces is achieved. Ambient pressure p amb is applied to the opposite side of the servo diaphragm. If there are any changes in the equilibrium of forces, the flow cross-section D after the valve V is changed. The pressure under the working diaphragm is re-adjusted. The regulator unit V adapts the free valve cross-section to the new flow requirement. Functional description valve V The plunger of the valve V is connected to the valve disc unit. When the plunger opens, it preloads the compression spring. The valve V opens completely without any delay. The valve V is actuated by the valve V. When the valve V is in the closed position, it closes off the area under the working diaphragm M so that this area is not affected by the burner pressure. Schematic diagram MBC-...-SE V Main valve V Main valve V Control valve V Control valve M D S E Pressure taps, gas train diagram MBC-...-SE Working diaphragm Restrictor Servo diaphragm Setting spring for outlet pressure p Br Closing function If there is an interruption in the power supply to the solenoid coils of the main valves V and V, they are closed by the compression springs in <s. p V p a V V M S b V E V V c a, b, c Pressure chambers in flow direction p Inlet pressure p Br Burner pressure, outlet pressure Ambient pressure p amb,,, 5 Screw plug G /, Screw plug G / 7 Stepping line p Br V D V pbr pamb p

3 Technical Data Nominal widths Max. operating overpressure Inlet pressure ranges Burner pressure ranges Media Ambient temperature Dirt trap device Pressure switch Servo pressure regulator Solenoid valve V, V Measuring gas connection Stepping line Voltage / frequency Electrical connection Power / current draw Switch-on duration Degree of protection DN Connection flanges as per EN 09- for welding neck flanges as per DIN (PN) DN 5 - DN 00 Length as per DIN 0 part, series F. mbar (50 kpa) p e = 5 - mbar (.5-50 kpa) Standard: p Br : 0-0 mbar ( - kpa) Option: See spring table, page Gases belonging to gas families,, and other inert gaseous media. -5 C to + C Filter A suitable gas filter must be connected upstream. For further information, see data sheet.0 Gas and air filter. The system can be equipped with pressure switch types GW A5, ÜB A, NB A as per DIN EN 5. In case of DN 5 GW A5 cannot be mounted on item. For further information, see data sheets 5.07 and 5.0 Pressure switches for DUNGS multiple actuators. Pressure regulator with admission pressure compensation, sealed with valve V when switched off, as per DIN EN Class A Servo pressure regulator with adjustable burner pressure Valve as per DIN EN Class A Group ; fast-closing, fast-opening S..0: driven together; S..: driven separately G / DIN ISO ; at inlet and outlet flanges, G / on both sides after the filter, on both sides between V and V, after V (if the pressure switch is assembled, it may not be possible to install a measuring gas connection in some cases) G / connection as per DIN ISO for burner pressure (pbr; gas) Stepping line for optional, external pulse must be made of steel and conform to PN, DN. The condensate from the stepping line may not enter the fitting. The operating and assembly instructions must be strictly followed. ~ (AC) 50 - Hz 0 V -5 % +0 % Standard voltages: 0-0 VAC, - VDC Plug-in connection as per DIN EN at ~ (AC) 0 V; +0 C: see type overview 00 % ED IP 5 as per IEC 59 (EN 59) Material used for gas-conveying parts Installation position Housing Diaphragms, seals Solenoid drive Vertical with upright solenoid cast aluminium NBR-based, Silopren (silicone rubber) aluminium, steel, brass Power / current draw at ~(AC) 0 V, + 0 C all indications are effective values Type MBC MBC-00-0 MBC-0-00 Starting power approx. [W] x 95 x 5 x 5 Holding power approx. [W] x 0 x 5 x 5 Break-away starting current [A] x 0.5 x 0.5 x 0.5 Holding current [A] x 0.0 x 0.0 x 0.0

4 Dimensions MBC-...-SE DN 5 - DN 00 b f c d space required for replaicing the solenoid e a Type Ordering No. 0 VAC DN P max. I max. [W] ~[A] ~(AC) 0 V Opening time a Dimensions [mm] b c d e f Solenoid No. Switching operations/h Weight [kg] MBC-900-SE-5 7 DN < s /P. MBC-00-SE-0 95 DN < s /P.0 MBC-0-SE-00 9 DN < s /P. Spring MBC-...-SE DN 5-00 Control range [mbar] Colour of the spring --- red black green Ordering-Nr

5 Characteristic curves for volume flow pressure difference in steady state with filter. A suitable gas filter must be used. MBC-900-SE-5 00 must be checked and enabled in the application MBC Recommended operating range p [mbar] Basis + 5 C, 0 mbar, trocken Based on + 5 C, 0 mbar, dry Base + 5 C, 0 mbar, sec Base + 5 C, 0 mbar, secco Vn [m /h] Luft / Air / Aria dv =,00 MBC-00-SE Vn [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0, must be checked and enabled in the application MBC Recommended operating range p [mbar] Basis + 5 C, 0 mbar, trocken Based on + 5 C, 0 mbar, dry Base + 5 C, 0 mbar, sec Base + 5 C, 0 mbar, secco Vn [m /h] Luft / Air / Aria dv =, Vn [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0, f = V gas used = Air density Density of the gas used V air x f Gas type Natural gas Town gas Liquefied gas Air Density [kg/m ] f

6 Characteristic curves for volume flow pressure difference in steady state with filter. A suitable gas filter must be used. MBC-0-SE must be checked and enabled in the application Recommended operating range MBC-0-SE-00 p [mbar] Basis + 5 C, 0 mbar, trocken Based on + 5 C, 0 mbar, dry Base + 5 C, 0 mbar, sec Base + 5 C, 0 mbar, secco Vn [m /h] Luft / Luft / Aria dv =, Vn [m /h] Erdgas/Naturgas/Gaz Naturel/Gas metano dv = 0,5 mechanically open p [mbar] MBC-900-SE-5 MBC-00-SE-0 MBC-0-SE Basis + 5 C, 0 mbar, trocken Based on + 5 C, 0 mbar, dry Base + 5 C, 0 mbar, sec Base + 5 C, 0 mbar, secco Vn [m /h] Luft / Air / Aria dv =, Vn [m /h] Erdgas/Natural gas/gaz Naturel/Gas metano dv = 0,5

7 System accessories Pressure switch ÜB A, NB A GW A5 Gas filter GF/, GF/, GF Valve testing system VPS 50 S0 Motorised butterfly valve DMK DN Line socket pole + PE Adapter, pressure gauge flange set G/ Ignition gas flange G / Cover, on the side Further information Data sheet 5.07 Data sheet 5.0 Data sheet.0 Data sheet.0 Data sheet. Ordering no The MBC-SE has been designed for direct assembly of DUNGS system accessories and supplementary equipment. Flanges, plug-in connection and system accessories must be ordered separately. 7

8 Double solenoid valve Regulator and safety combination Servo pressure regulator MBC-...-SE DN 5 - DN 00 Key data Key data Application Application Gas Type of gas / specific density [kg/m ] Volumetric flow V [m /h] V min. V max. Inlet pressure p e [mbar] p e,min. p e,max. Burner pressure p Br [mbar] at V min. at V max. Control range, power range Time taken to re-adjust volume restrictors from small load to large load [s] Starting load [m /h] Company / address Name / person in charge Telephone We reserve the right to make changes in the interest of technical progress. Head Offices & Factory Karl Dungs GmbH & Co. KG Karl-Dungs-Platz D-7 Urbach, Germany Telefon +9 (0)7-0-0 Telefax +9 (0)7-0- Postal address Karl Dungs GmbH & Co. KG Postfach 9 D-7 Schorndorf, Germany info@dungs.com Internet