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StarPac Intelligent Control System FCD VLENIM0066-02 02/10
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Figure 22: Driver Module Vent
Maximum Allowable
Driver Housing
Back Pressure
2.0 psig (0.14 barg)
1/4” NPT x 1/4”
Swagelok Tube Fitting
1/4” FNPT x 1/8”
NPT Reducer
The spool valve chamber (see Figure 23) must also be vented through the spool valve cover. Install a tube fitting into
the spool valve cover (part no. 179477). Connect the necessary tubing/piping to this fitting to route the exhausted na-
tural gas to a safe environment. The maximum allowable back pressure in the spool valve chamber is 8 psig (.55 barg).
Pressures greater than 8 psig will cause vented gas to leak past the spool cover O-ring to the atmosphere and will result
in overshoot of the positioner.
Figure 23: Spool Cover Vent
3/8” NPT x 3/8” Swagelok
Tube Fitting
Maximum Allowable
Spool Back Pressure
8 psig (0.55 barg)
Customer Connection
3/8” Tubing
