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    Air Gas Ratio Regulators, Type GG/GGB/GGO DATA SHEET
GG_GGB_GGO
   
FEATURES :
  • Maintains Constant Air-Gas Ratio
  • High Precision Regulation
  • Wide Regulation Range
  • Available with Inlet Pressure Compensation Diaphragm
  • Inlet Pressure up to 200 mbar
  • Practically Maintenance Free
  • Compliance EN 746-2
  • Problem free adjustment during operation is possible   
APPLICATION :
Ratio Control Valves maintain constant air & gas ratio and regulate the gas pressure
Type GG For Steady Control
Type GGB For On- Minimum-Off Control
Type GGO Zero pressure regulation
(The gas inlet pressure must always be higher than the control pressure).
CONSTRUCTION :
Valve Body Aluminium Silicon Alloy
Valve Disc Aluminium with vulcanized Perbunan (Nitrile Seat)
Compensating Diaphragm Perbunan/Nitrile
Working Diaphragm Perbunan/Nitrile
Valve Seat & Stem Aluminium
Size Range 15, 20, 25, 40 to 80 mm
End connection Screwed to BSP(F) / NPT(F) upto 65 mm; 80 mm flanged
Working Temperature (-)15° C to (+)60° C
Inlet Pressure up to 200 millibar
Combustion Air Pressure GG - 0.5 to 120 mabr & GGB - 0 to 120 mbar
Controlled Outlet Pressure (Variable)
For GG Type
For GGB Type		 GG - 1.2 to 120 mbar
GGB - 0 to 117 mbar
Outlet Pressure=Control Pressure(Combustion Air)
Outlet Pressure=Control Pressure less 2 to 4 mbar
Differential Pressure Maximum 100 mabr (Between Inlet & Outlet)
Fluids All Gases - Natural Gas, LPG,Biologically Produced Methane, Special Version available for Air
Regulating Pressure Range GG ( 10:1 ) with Control Pressure 50 to 0.5 mabr
GG ( 08:1 ) with Control Pressure 32 to 0.5 mabr
GG ( 06:1 ) with Control Pressure 19 to 0.5 mabr
GG ( 05:1 ) with Control Pressure 12.5 to 0.5 mabr
INSTALLATION :
Safety Solenoid Valve must always be fitted upstream of Air Gas Ratio Regulator and in the direction of flow marked on the valve body. The spring retaining dome must be installed downwards. Spring force of GG can be adjusted by means of a 6 mm Allen key. During installation of GG/GGB, fixed orifice plates or variable flow resistor must be used in the gas line as well as combustion air pipeline. These orifice plates will determine and fix Air Gas ratio required for complete combustion. When using GGO, variable flow resistor / orifice plate should be provided in the gas pipe line, before mixture (Injector). If combustion air pressure is higher than the gas inlet pressure, the variable flow resistor should be used to turn down the gas control pressure.              

 

 


 
 
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NOTE :
 Gas inlet pressure must be always higher than the control pressure. When supplied threaded version size 15 to 50 MM, is provide with Internal By-pass connection. When supplied with Externally Screwed or Self Casted flanges, requires additional external impulse line to be fitted Size Rp 3/8” (at distance of minimum 5 pipe size after outlet of Air/Gas Ratio control).
GENERAL FEATURES :
 ‘GG’ For steady control with a spring fitted for compensating the weight of the diaphragm assembly, provided with small diameter internal impulse connection.
‘GGB’ For On, minimum Off control. No spring provided; supplied for by-pass with low fire operation. Large size valve requires external impulse.
GGO- For zero pressure control, with spring for compensating the weight of the metering assembly, has a small diameter internal impulse line. Zero pressure governor GGO for injector (Pre Mix Type) burner.
DIMENSIONAL DETAILS :
Model Size
mm		 Connection Dimensions Approx
Weight
kgs.
L H1 H2 ØD C H3
GG 15 R02 15 Rp 1/2 90 45 119 98 29 100 0.7
GG 20 R02 20

Rp3/4

 100 40 150 120 38 119 1.1
GG 25 R02 25 Rp 1 110 40 155 132 46 122 1.3
GG 40 R02 40 Rp 1 ½ 158 55 210 190 70 135 3.1
GG 50 R02 50 Rp 2 190 73 250 240 88 177 4.6
GG 65 R02 65 Rp 2 ½ 190 73 250 240 88 177 4.5
GG 80 F02 80 3 380 102 425 310 115 267 10
GGB 15 R02 15 Rp 1/2 90 45 119 98 29 100 0.7
GGB 20 R02 20 Rp3/4 100 40 150 120 38 119 1.1
GGB 25 R02 25 Rp 1 110 40 155 132 46 122 1.3
GGB 40 R02 40 Rp 1 ½ 158 52 210 190 70 135 3.1
GGB 50 R02 50 Rp 2 190 68 250 240 88 177 4.6
GGB 65 R02 65 Rp 2 ½ 190 73 250 240 88 177 4.5
GGB 80 F02 80 3 380 102 425 310 115 267 10
SPECIFIC GRAVITY :
Natural Gas 0.62
Town Gas 0.45
LP Gas 1.56
Air 1.0
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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