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    Two Stage Solenoid Valves, Type SGZ DATA SHEET
SGZ
   
FEATURES :
  • Two stage operation with lower firing rate.
  • Robust & long life construction,
  • Suitable for maximum pressure 360 milibar
OPERATING PRINCIPLE :
Two stages operated solenoid valve for on-off control of air and gas used in gas burning systems or gas burners. In order to save energy, this two-stage valve is used for atmospheric boilers having capacity less than 120 kw.
 
CONSTRUCTION :
Valve Body Aluminium Silicon Alloy Castings
Valve Disc Seal Perbunan
Inbuilt Strainer Brass (size 15-40/32 mm) Stainless Steel (40-65 mm)
End Connection Screwed to BSP/ NPT (F)
Or Flanged to ANSI B16.5 Class 150 RF
Working Temperature 360 milibar maximum
Pressure Test Points 1/4" NPT on inlet and outlet of the valve.
Voltage 230 VAC (+10/-15%), 50/60 Hz Standard via protective circuit rectifiers
Cable Gland Pg11 (upto 40mm size), & Pg13.5 (from 50-65 mm)
Coil Protection As per IP-54 (According to IS2 147) Class "F" insulated
Switching Frequency Universal with full reproducibility of instant passage of gas 5 second waiting period between 2 operations.
Opening Time 0.5 to 5 seconds for "1" stage (adjustable)
10 seconds for 2nd stage (fixed)
Closing Time Less than 1 second, with slow restrictor.
Fluids Natural Gas, LPG in gaseous form, Town Gas, Bio-Gas etc.
 
APPLICATION :
For the protection, Shut-off and release of the air and gas supply to gas burners and gas devices with two-step operation.
The two-step operation allows an improvement of the efficiency at low fire.
The regulations for heating plant specify a two-step operation for atmospheric boilers with a capacity > 120kW, in order to save energy. A two-step operation is also practical for capacities < 120kW.   

 
DIMENSIONAL DETAILS :
Type Size Flow
Factor
KV
Dimensions Working
Pressure
Volume with
∆p= 1mbar
Coil Load Weight
L D H1 H2 H3 E    
  mm m³/hr mm mm mm mm mm mm milibar m³/hr VA W kgs.
SG 15 R 03 Z 15 4.3 71 --- 235 24.0 62.0 61 360 3.8 39 47 3.3
SG 20 R 03 Z 20 9.1 91 --- 249 33.0 70.0 66 360 8.0 52 62 3.8
SG 25 R 03 Z 25 11.4 91 --- 249 33.0 70.0 66 360 10.0 52 62 3.8
SG 40/32 R 01 Z 40 18.0 128 --- 268 39.0 76.0 66 130 18.0 52 62 4.4
SG 40 R 01 Z 40 24.0 150 128.5 372 50.5 86.0 -- 130 24.0 75 90 8.8
SG 40 F 01 Z 40 24.0 200 128.5 372 50.5 86.0 -- 130 24.0 75 90 10.5
SG 50 R 01 Z 50 37.0 180 156.5 383 62.0 97.5 -- 130 37.0 80 96 11.0
SG 50 F 01 Z 50 37.0 230 156.5 38 62.0 97.5 -- 130 37.0 80 96 13.0
SG 65 F 01 Z 65 57.0 290 183.5 395 74.0 109.5 -- 130 57.0 87 104 22.0
 
1
 
FUNCTION OF DUAL STAGE :
After applying the mains voltage to LV1 terminal, the valve starts opening up to the adjustable 1st stage. When the voltage is applied to LV2 terminal, the valve opens completely and releases gas to the pre-adjusted gas flow.
When LV2 is disabled, the valve comes back to the 1st stage. The valve closes fully when LV1 is disabled.  
    
SGZ WITH CLOSED POSITION INDICATOR :
An inbuilt micro switch is provided in device for indicating close or open position depending upon the wiring of the contact sequence and standard adjustment at factory.      
FLOW ADJUSTMENT :
Flow can be adjusted from 20 to 40% of the maximum flow.
FACTORY SETTING :
Maximum adjustment of first and second stages by adjusting the flow restrictor.
ADJUSTING INITIAL :
Adjustable for 0 to 70% of throughput having ∆p=mbar.
Gas flow with help of damping device, the user can do initial adjustment.


 

SGZ Type Two Stage Solenoid Valve
50 Size mm 15, 20, 25, 40, 50, 65
F End Connections R= Flanged to DIN PN16
F= Flanged to ANSI B16.5, Class 150 RF
01 Inlet Pressure 01 = 130 mabr
03= 360 mabr
L Type Of Opening L=Slow Opening
N=Fast Opening
T Mains Voltage T = 220 / 240 V, 50 /60 Hz
3 Connection Box 3 = With IP54 terminal
6 = With Standard Socket
1 Screw at the inlet & outlet 1= Screw at the inlet
3= Screw at the inlet & outlet
D(*) With flow adjuster D=Flow adjuster
S=Position Indicator
V(*) With Viton Seal  
(*)Optional Feature, when(*) this letter is dropped, the next letter moves up.
 
Note:
Technical specifications details & dimensions are subject to change without prior notice.
Dimensions in the table are approximate subject to final confirmation by AVCON.
   
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