6
3L.P. GAS s.r.l.
TECHNICAL MANUAL ICM
When the above controls have been carried out, the
valve can be fitted in line, making sure that the body
is oriented so that the flow is in the direction shown by
the arrow impressed on the body itself.
For proper regulation, it is indispensable for the
downstream sensing line to be connected to a
rectilinear strech of the downstream piping itself with
a length in accordance with the Fig. 6 and 7 and with
a maximum gas speed at the take-off point not
exceeding 30 m/sec.
The following is recommended so as to prevent the
accumulation of impurities and condensate in the lines
of the pressure take-offs:
a) the piping itself must slope down towards the down-
stream connectors with a slope of about 5 - 10%;
b) the connectors on the piping must always be wel-
ded on the top of the piping itself and there must
be no burr or inward protrusion in the hole in the
piping.
N.B. DO NOT PTU ON/OFF VALVES ON THE
IMPULSE TAKE-OFFS
The most common types of installation for the ICN
cut-off device are shown in figures 6 and 7.
Figure 6 shows installation in a pressure regulation
line, figure 7 shows installation on a generic trunk.
Fig. 6
Fig. 7
V1
Upstream on-off valve
1
Gas safety cut-off device Fig. 7
2
Pressure regulator with built-in cut-off device Fig. 6
3
Pilot
4
Upstream pressure gauge
5
Downstream pressure gauge
6
Downstream bleed valve
V2
Downstream on-off valve
