DUNGS MBC-...-SE, Combined servo pressure regulator and safety shut-off valves

[{"filename":"mbc-se-dn65-dn100_datasheet_en_231888.pdf","text":"Double solenoid valve\n Combined pressure\n regulator and safety\n valves Servo pressure\n regulator\n\n MBC-...-SE\n DN 65 - DN 100\n\n 7.34\n\n\n\n\n Technical Description design, high flow rates can be achieved at\n The DUNGS multiple actuator MBC-...-SE low pressure difference.\n integrates valves and servo pressure regu-\n lator in one compact unit: Application\n The servo pressure regulator permits opti-\n - Solenoid valves up to 500 mbar (50 kPa) mal mixture formation in forced air burners\n as per DIN EN 161 Class A Group 2 and premix burners in combination with\n - Fine setting of outlet pressure mechanical or electronic gas/air regulation\n - Servo pressure regulator unit as per DIN units. This applies to modulating and multi-\n EN 88 Class A Group 2 stage variable operating modes.\n - Setpoint spring replaced Suitable for gases belonging to gas families\n\n\n\n\n Printed in Germany • Edition 01.18 • Nr. 231 888\n - Outlet pressure: 4 - 300 mbar (0.4 - 30 kPa) 1, 2, 3 and other inert gaseous media.\n - Internal stepping lines for optimised outlet\n pressure stability, external as an option. Approvals\n - Flange connection as per EN 1097-1 EC type testing certificate as per:\n - Easy to install • EC-Gas Appliances Regulation\n - Low weight • EC-Pressure Equipment Directive\n Approvals in other important gas-consum-\n As this system has a modular design, we ing countries.\n can offer individual solutions with valve\n testing system, mini/maxi pressure switch\n and pressure limiter. Despite the compact\n1…8\n\fFunctional Description\nGas flow Schematic diagram MBC-...-SE\n1.If the valves V1 and V2 are closed,\n chamber a is subjected to inlet pres- V1 V2\n\n sure up to the double seat of the\n valve V1.\n2.The min. pressure switch (option) is a b c\n p1\n connected to chamber a via a bore pBr\n hole. If the inlet pressure exceeds M\n\n the desired value set on the pressure V3 V4\n D\n\n switch, the pressure switch connects\n through to the gas burner control S\n pamb\n system.\n E\n\n\n\n3.The valves V1 and V2 open after they\n are enabled by the gas burner control V1\t\t Main valve 1 a, b, c\t\t Pressure chambers\n system. Gas flow through chambers V2\t\t Main valve 2 \t\t in flow direction\n a, b and c is enabled. V3\t\t Control valve 3 p1\t\t Inlet pressure\n V4\t\t Control valve 4 pBr Burner pressure, outlet pressure\n pamb Ambient pressure\nFunctional description of the combined M\t\t Working diaphragm\nvalve-regulator unit at valve V1 D\t\tRestrictor 2, 3, 4, 5 Screw plug G 1/8\nA regulator (pressure regulator unit) S\t\t Servo diaphragm 1, 6\t\t Screw plug G 1/4\n E\t\t Setting spring for 7\t\tStepping line pBr\nwith admission pressure compensation \t\t outlet pressure pBr\nis integrated in valve V1. The plunger\nV1 is not connected to the valve disc\nunit. When the plunger opens, it\npreloads the compression spring and\nreleases the regulator unit. When the\nplunger closes, the closing pressure\nis applied directly to the valve discs of\nthe regulator unit. Valves V1 and V2 are\ndriven together electrically. When valve\nV3 is in the closed position, it closes off V3\nthe pressure chamber under the work-\ning diaphragm M so that this chamber\nis not affected by the inlet pressure p1 p1 p2\n\nin chamber a. The plunger of valve V1 V1 V2\ncontrols the valve V3. The pressure un-\nder the working diaphragm M depends\non a variable flow cross-section D. The V4\noutlet pressure pBr counters the force\nof the setting spring E via the servo\ndiaphragm S until an equilibrium of\nforces is achieved.\nAmbient pressure pamb is applied to the\nopposite side of the servo diaphragm.\nIf there are any changes in the equilib-\nrium of forces, the flow cross-section Pressure taps, gas train diagram\nD after the valve V4 is changed. The 6\npressure under the working diaphragm MBC-...-SE 8 1 2 3 4 5 9\nis re-adjusted. The regulator unit V1\nadapts the free valve cross-section to 3\nthe new flow requirement. 2\n 6 7 1\n 8\nFunctional description valve V2 10\nThe plunger of the valve V2 is connected\nto the valve disc unit. When the plunger\n 8 1 2 3 4 11 12 5 9\nopens, it preloads the compression\nspring. The valve V2 opens completely\nwithout any delay. The valve V4 is actu- Closing function 12\nated by the valve V2. When the valve If there is an interruption in the power\nV4 is in the closed position, it closes off supply to the solenoid coils of the main\nthe area under the working diaphragm valves V1 and V2, they are closed by\nM so that this area is not affected by the the compression springs in <1s.\nburner pressure.\n\n\n 2…8\n\f Technical Data\n\n Nominal widths DN\t\t65\t\t80\t\t100\n Connection flanges as per EN 1092-1 for welding neck flanges as per\n DIN 2633 (PN16) DN 65 - DN 100\n Length as per DIN 3202 part 1, series F1.\n\n Max. operating overpressure 500 mbar (50 kPa)\n Inlet pressure ranges pe = 15 - 500 mbar (1.5 - 50 kPa)\n\n Burner pressure ranges Standard: pBr : 20 - 40 mbar (2 - 4 kPa)\n Option: See spring table, page 4\n\n Media Gases belonging to gas families 1, 2, 3 and other inert gaseous media.\n\n Ambient temperature -15 °C to +60 °C\n\n Dirt trap device Filter\n A suitable gas filter must be connected upstream.\n For further information, see data sheet 11.02 “Gas and air filter”.\n\n Pressure switch The system can be equipped with pressure switch types GW A5, ÜB A2, NB A2 as per DIN\n EN 1854. In case of DN 65 GW…A5 cannot be mounted on item 2. For further information,\n see data sheets 5.07 and 5.02 “Pressure switches for DUNGS multiple actuators”.\n\n Servo pressure regulator Pressure regulator with admission pressure compensation, sealed with valve\n V1 when switched off, as per DIN EN 88 Class A\n Servo pressure regulator with adjustable burner pressure\n\n Solenoid valve V1, V2 Valve as per DIN EN 161 Class A Group 2; fast-closing, fast-opening S..0: driven\n together; S..2: driven separately\n\n Measuring gas connection G 1/4 DIN ISO 228; at inlet and outlet flanges, G 1/8 on both sides after the filter,\n on…