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SSV 8500 (for RB 4700 models with integrated SSV 8500)
Operating principle of the shut-off valve
The shut-off device is a safety device that goes off when
the pressure value in the downstream pipe increases
or decreases beyond the prefixed cali bration values,
cutting automatically the flow of the gas.
Shut-off valve with screw reset
These device consists of a valve body 10, a control head,
a diaphragm assembly 4 - 15 and a stem–valve plug
assembly 12 – 18, which remain in a balanced position
through a mechanical ball sys tem. The shut-off valve is
triggered when the pres-
sure value in the control chamber 5, that from the
downstream pipe flow into this chamber through the
impulse intake 14, increases or decreases be yond the
established pressure values, thus moving from its balanc-
ing position the diaphragm assem bly 4 – 15. The stem 18
connected to the valve plug 12 triggers under the force of
the spring 13, coming immediately into contact with the
valve 8 cutting automatically the flow of the gas.
NOTE: The schematic section refers to a safety valve
installed of series 8500, but the operating principle
is valid even for other safety valves in stalled of series
8200 and 8300.
Item
1
2
3
4
5
6
7
8
9
10
1 1
12
13
14
15
16
17
18
19
20
21
Description
Screwing ring
Cover
Vent
Diaphragm
Motorisation chamber
Flange
Valve plug plate
Valve orifice
inlet chamber
Valve body
Outlet chamber
Valve plug
Valve plug spring
Diaphragm plate
Impulse intake
Balls
Max calibration spring
Stem
Cover
Screwing ring
Min calibration spring
27
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