ITRON RB 4731 - Materials and Selection Options; Regulator Version Selection; Safety Shut-off Option Selection

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Materials
Body Spheroid graphite cast-iron EN-GJS-400-15 DIN 1693
Cast Steel G 20Mn5N
Pilot Blocks: steel UNI 5105
Cover: aluminum UNI 6362
Head Pressed steel / UNI EN10025
Internal parts Stainless steel and brass
Seals Nitrile rubber
Diaphragm Polyester fabric
* DVGW approval for Pemax = 16 bar (with modified diaphragm housing).
Selection of the regulator version
To specify the version of the RB 4700 series to be ordered, the options and
relevant codes should be selected from the table below.
R X X 4 7 X X - D DN X Variants
B Balanced - High accuracy version
E External impulse
1 Low pressure (TF 511): 5 - 280 mbar
2 Medium pressure (TF 512): 0.1 - 1 bar
3 High pressure (TF 513): 0.25 - 13 bar
0 Without safety devices
1 Over-pressure shut-off valve
2 Over- and low-pressure shut-off valve
- D DVGW approval
25 Orifice (Ø 30 mm)
40 Orifice (Ø 38 mm)
50 Orifice (Ø 48 mm)
80 Orifice (Ø 78 mm)
10 0 Orifice (Ø 98 mm)
S Silent version
Example: Model RBE 4711 DN25 S is a regulator with a TF 511 pilot, an over-pressure shut-off and
silencer.
Selection of the safety shut-off options
SSV 8600 with: DN 25 / 40 / 50 / 80 / 100
SSV 8500 with: DN 25 /40 / 50 / 80 (Please contact for Pe>=6 bar by DN50-DN80)
Safety device features
Manual bottom control for voluntary intervention
Manual reset
Built-in by-pass system