Operation
1. To place the FLM in sample mode, move
the black handle (BV1/BV2) to the right.
This will switch the flow to the sample
side of the FLM.
2. To place the FLM in bypass mode, move
the black handle to the left. This allows
all FLM flow to bypass the sample side
of the loop.
3. Configurations 3 and 4: To drain the
system while in bypass, open the plug
valve (PV). Configuration 3 systems may
not drain completely. If more effective
draining is required, Configuration 4
would be more appropriate.
4. Configurations 3 and 4: To place the
system in drain/purge mode, move the
black handle to the left to put the FLM
in bypass mode. Then move the red
handle to the down position to switch
the analyzer return line to drain mode
and opens the purge lines. (Purge lines
are in Configuration 4 only.)
5. Configuration 4: To adjust purge flow,
turn the handle of the purge needle
valve (NV3), clockwise for less flow or
counterclockwise for more flow.
6. To collect a sample from the grab
sample outlet, open the needle valve
(NV2) .
7. To return the FLM to sample mode,
reverse steps 1 through 3.
Failure to periodically inspect and
maintain valve packing may result
in leakage.
Swagelok ball valves are
designed to be used in the fully
open or fully closed position.
Needle valve
(NV1)
1/2 in. Fast Loop Module, Gas System, Configuration 4
Black handle
(BV1/BV2)
Red handle
(BV3/BV4)
Plug valve
(PV)
Pressure
indicator
(P1)
Grab sample
needle valve
(NV2)
Purge needle
valve (NV3)
A Swagelok Pre-Engineered Subsystem Fast Loop Module
15
