Air Products Gasguard 250, Installation Manual

Page: 29 / 68

Gasguard
®
250 VMB System Installation Manual
Air Products and Chemicals, Inc. Page 3 - 10
Figure 3.6 shows the typical exhaust hook-up location. See installation drawing in
the Appendix for specific location and size of exhaust duct on valve manifold
enclosure.
Figure 3.6: Exhaust Hook-Up Location
3.8 Weld Shield Gas, Purge Gas Connection
(Optional)
This optional VCR connection port provides a convenient point to introduce inert
shielding gas for welding, purge gas and certification gas during installation and
testing of the valve manifold box. The connection is teed from the purge gas inlet
line and includes a manual shut-off valve (MV-30). An access hole at the bottom
of the enclosure permits temporary tubing to be inserted and connected to the VCR
fitting inside. When the temporary gases are no longer required, the valves should
be closed and the VCR connection capped.
Do not connect high pressure gas directly
to the weld gas port. A pressure reducing
regulator with a maximum delivery
pressure of 100 psig should be used on the
high pressure inert gas supply. A safety
relief device set at 150 psig should be
installed downstream of the pressure
regulator.