DUNGS MBC-300/700/1200-SE/N, safety shut-off valves

[{"filename":"mbc-300-700-1200-se-n_datasheet_en_240417.pdf","text":"GasMultiBloc®\n Combined servo pressure\n regulator and safety shut-off valves\n\n MBC-300-SE\n MBC-700-SE\n MBC-1200-SE\n MBC-300-N\n MBC-700-N\n\n 7.01\n\n\n\n\n • Max. operating pressure\n 360 mbar (36 kPa)\n\n • Compact design\n\n • High flow rates\n\n • Low weight\n\n • Low power consumption\n\n • Modulating mode\n\n • Adjustable outlet pressure up\n to 380 mbar (8 kPa)\n\n • Other servo pressure regulator\n variants:\n\n • zero pressure\n\n • constant pressure\n\n • Mountable accessories\n Technical Description Application\n • Pressure switch The DUNGS multiple actuator MBC...SE The servo pressure regulator permits opti-\n integrates filter, valves and servo pressure mal mixture formation in forced air burners\n regulator in one compact unit: and premix burners in conjunction with\n • VPS\n mechanical or electronic integrated gas-air\n - Dirt trap: Microfilter regulation units; this applies to modulating\n - 2 Solenoid valves up to 360 mbar (36 kPa) to and multi-stage floating operating mode.\n DIN EN 161 Class A Group 2, fast opening Suitable for gases of gas families 1,2,3 and\n - Servo pressure regulator unit to DIN EN 88 other inert gaseous media.\n Class A Group 2\n - Outlet pressure: 0 - 80 mbar (0 - 8 kPa) Approvals\n\n\n\n\n Printed in Germany • Edition 2025.01 • Nr. 240 417\n - Precision regulation of outlet pressure EC type testing certificate as per:\n - For optimal outlet pressure stability • EC-Gas Appliances Regulation\n - Flanged joints with pipe threads to ISO 7/1 • EC-Pressure Equipment Directive\n or NPT Approvals in other important gas consum-\n - Easy to install ing countries.\n - Low weight\n\n The modular system permits individual\n solutions with valve proving system, min./\n max. pressure switches and pressure\n limiters. High flow rates at low pressure\n1…9 differences.\n\fFunctional Description\n Schematic diagram MBC...SE/N\nGas flow\n1.If valves V1 and V2 are closed, cham-\n ber a is subjected to inlet pressure. a b\n2.The min. pressure switch (option) is p1 R\n connected to chamber a via a bo- pBr\n ring.\n If the inlet pressure drops below M pBr pBr\n the desired value set on the pres-\n D intern extern\n Standard Option\n\n sure switch, the switch opens in the\n direction of the gas burner control\n system. S\n pamb / pL\n3.After they are enabled by the gas\n E\n\n burner control system, valves V1 and\n V2 open. M Working diaphragm a, b Pressure chambers in flow direction\n Gas flow is released through cham- D Restrictor p 1\n Inlet pressure\n bers a and b. S Servo diaphragm p Br\n Burner pressure, outlet pressure\n E Setting spring for p amb\n Ambient pressure\nFunctional description of the com- outlet pressure p Br\n\n\n R Regulator disc\nbined valve-regulator unit\nValves V1 and V2 can be controlled\nelectrically and separately. Each valve\npreloads its own compression spring\nwhen the plunger opens. When the two\nvalves are open, a pressure pulse runs\nbelow the working diaphragm. The size 16\n 15\nof the pressure pulse changes as a fac- 14\n\ntor of the variable restrictor position D. 11 13\n\n\nThe outlet pressure p acts against\n Br\n 10\nthe setting spring force via the servo 9\n\ndiaphragm until a force equilibrium is\nattained.\nThe opposite side of the servo dia- 8\n\n\nphragm is pressurised at the current\n 7\n 6 V1\n\nambient pressure p or air pressure p .\n amb L\n 5 V2 12\n\n\nChanges in the equilibrium of forces lead\nto a change in flow cross-section. p1 p2\n\n\nThe pressure under the working dia- 4\n\n\nphragm re-adjusts itself. The regulator\n 3\n 2 17\n\nunit adapts the free valve cross-section 1\n\n\nto the new flow requirement.\n\nClosing function\nIf there is an interruption in power supply\nto the solenoids of valves V1 and V2, 1 Pressure regulator unit 8 Plunger V1 15 Solenoid V2\nthey are closed by the compression 2 Regulator spring 9 Solenoid V1 16 Solenoid housing\nsprings within <1s. 3 Connecting flange 10 PCB 17 Adjustment:\n 4 Micro-filter 11 Electrical connection - Gas pressure p\n Br\n\n\n 5 Valve V1 12 Valve V2\n 6 Closing spring V1 13 Closing spring V2\n 7 Housing…