DUNGS , DUNGS Vietnam , DUNGS Viet nam , DUNGS COMBUSTION CONTROLS , DUNGS COMBUSTION CONTROLS Vietnam
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GasMultiBloc
®
Combined regulator and safety shut-off valves Two-stage function
MB-ZRD(LE) 415 - 420 B01
7.26
Technical description
The DUNGS GasMultiBloc®
integrates filter,regulator, valves and pressure switches in one compact fitting.
- Dirt trap: microfilter
- One regulator and two main valves:
B01
- One one-stage valve and one two-stage
valve
- One valve is fast opening, one valve is slow or fast opening
- Solenoid valves up to 360 mbar (36 kPa) as per DIN EN 161 Class A Group 2
- Sensitive setting of output pressure by proportional regulator as per DIN EN 88
Class A Group 2
- High flow rates with low pressure drop
-DC solenoid drive interference degree N-Main volume restrictor and partial volume restrictor at valve V2
- Hydraulic opening delay
- Flange connections with pipe threads asper ISO 7/1
-Simple mounting, compact, light-weight
The modular system permits individual solutions by using external ignition gas tap in connection with separately controlled valves, by adding a valve proving system,
mini/maxi pressure switches, pressure
limiters, limit switch at valve V2.
Application
The modular system permits individual solutions in gas safety and regulator engineering. Suitable for gases of families 1, 2,3 and other neutral gaseous media.
Approvals
EC type testing certificate as per:
•
EC-Gas Appliances Regulation
•EC-Pressure Equipment Directive
Approvals in other important gas consuming countries.
Printed in Germany • Edition 01.18 • Nr. 225 664
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Functional description of gas flow
1. When the valves V1 and V2 are closed,
chamber A is under inlet pressure.
2. A hole D in the filter housing connects min. pressure switch with chamber A. If
the inlet pressure applied to the pressure
switch exceeds the incoming reference
value, it switches through to the automa
-
tic burner control.
3. After release by the automatic burner
control, valves V1 and V2 open. The gas
flows through chambers A, B and C of
the GasMultiBloc.
4. On request, the second stage of valve
V2 opens.
Operating method of valve-regulator
combination on valve V1
A regulator, compensating for residual
pressure is integrated in valve V1 (pressure
regulating part). Armature 8 is not con
-
nected to valve plate unit 3. When it opens,
armature 8 pretensions compression spring
(V1) 5 and releases the valve plate unit.
When the valve closes, the armature acts
directly on the valve plate unit.
The output
pressure upstream of valve V2 is defined by
pretensioning regulating spring 7 (tension
spring) via setting screw 18.
The output pressure acts via opening E on
the working diaphragm 22 of the regula
-
tor part. In regulated state, setting spring
inlet pressure and pressure of working
diaphragm are in force equilibrium.
The compensating diaphragm 23 ensures
the fast closing function of valve V1 and a
high regulating quality.
Operating method of valve V2
Armature 14 of valve V2 is connected to
valve plate unit 11. When it opens, armature
14 pretensions closing spring 13. The valve
opening of stage 1 can be set by limiting the
armature stroke by means of main volume
restrictor 19.
Min. opening (residual stroke) of valve
(0.5 to 1.0 mm)
If the second stage of valve 2 opens, clos
-
ing spring 13 is continuously pretensioned.
The maximum valve opening of stage 2 can
be set by limiting the armature stroke of
armature 16 by means of the main volume
restrictor. Main volume restrictor 20 is set by
rotating the adjusting plate or the hydraulic
brake . The fast and/or slow opening charac
-
teristic acts on both stages. It is influenced
by setting the fast stroke at the hydraulic
brake under the cover.
Closing function
When the supply voltage to the solenoid
coils of valves V1 and V2 is interrupted, they
are closed within < 1 s by the compression
springs.
Electrical connection
Sectional drawing of MB-ZRDLE...
Pressure taps
0, 1, 2, 3, 4, 5
G 1/8 screw plug
Setting:
19 - Gas pressure p
a
20 -
Partial volume, 1st stage
21 - Main volume
22 - Fast stroke
23 Working diaphragm
24 Compensation
diaphragm
1 Pressure regulator
2 Microfilter
3 Valve V1
4 Connection flange
5 Closing spring V1
6 Housing
7 Regulating spring
8 Armature V1
9 Solenoid V1
10 Gas pressure switch
11 Electrical connection
12 Valve V2
13 Closing spring V2
14 Armature V2 (1st stage)
15 Solenoid V2 (1st stage)
16 Armature V2 (2nd stage)
17 Solenoid V2 (2nd stage)
18 Electrical connection
Valves V1, V2
1st stage
Valve V2
2nd stage
S 22/S 52
S 20/S 50
1
2
3
1
2
3
3 ... 6
MB-ZR...420 B01
Rp 1, 1 1/4, 1 1/2, 2
and their combinations
Specifications
Nominal diameters
Flange with pipe threads as per
ISO 7/1 (DIN 2999)
Max. operating pressure
Output pressure ranges
Media
Ambient temperature
Dirt trap
Pressure switches
Pressure regulator
Solenoid valve V1
Solenoid valve V2
Measuring / Ignition gas connection
Burner pressure monitor p
Br
Voltage / Frequency
Electrical connection
Rating / Power consumption
Switch-on duration
Degree of protection
Radio interference
Materials of gas conveying parts
Installation position
Closed position signal contact
MB-ZR...415 B01
Rp 1, 1 1/4, 1 1/2, 2
and their combinations
360 mbar (36 kPa)
MB-ZR... S20/S22 p
a
: 4 mbar (0.4 kPa) to 20 mbar (2 kPa)
MB-ZR... S50/S52 p
a
: 20 mbar (2 kPa) to 50 mbar (5 kPa)
Gases of families 1, 2, 3 and other neutral gaseous media
-15 °C to +70 °C (Do not operate MB-ZR below 0 °C in liquid gas systems.
Only suitable for gaseous liquid gas, liquid hydrocarbons destroy sealing ma
-
terials.)
Sieve, microfilter, changing the filter is possible without removing the valve.
Types GW...A5, ÜB...A2 / NB...A2 to DIN EN 1854 may be attached.
For further information, refer to Datasheets 5.02 and 5.07 “Pressure Switches
for DUNGS Multiple Actuators”
Pressure regulator compensated for residual pressure, leakproof seal when
switched off by means of valve V1 as per DIN EN 88 Class A.
Setpoint spring permanently installed (no spring exchange possible). A vent line
above roof is not required. Internal pulse tap provided.
Valve as per DIN EN 161 Class A Group 2, fast closing, fast opening
Valve as per DIN EN 161 Class A Group 2, fast closing
Valve V2 design
Partial volume restrictor
Main volume restrictor
MB-ZR
fast opening
with
without
MB-ZRD
fast opening
with
with
MB-ZRDLE
slowly opening
with
with
MB-ZRLE
slowly opening
with
without
For G 1/8 as per DIN ISO 228, refer on page 4
Connection downstream of valve V2, pressure switch mountable on adapter laterally
50 - 60 Hz, 220 - 230 V AC, -15 % +10 %
Other preferred voltages: 240 VAC, 110 - 120 VAC, 48 VDC, 24 - 28 VDC
Plug connection as per DIN EN 175301-803
for valves and pressure switches
Refer to Dimensions on page 5
100 %
IP 54 as per IEC 529 (EN 60529)
Interference degree N
Housing
aluminium die casting
Diaphragms, seals
NBR basis, Silopren (silicone rubber)
Solenoid drivesteel, brass, aluminium
Solenoid vertically upright or lying horizontally as well as its intermediate positions.
Closed position signal contact, type K01/1 (DIN-tested), mountable to
V2