FLT
®
Series FlexSwitch
TM
INSTALLATION
Fluid Components International LLC 7
Packing Gland Assembly
For applications involving the use of a packing gland (low or medium pressure) refer to the drawings in Appendix A for additional detail.
1. Threaded or flanged packing gland mounts are available. The valve assembly with appropriate connections are customer supplied. Follow
the male NPT mounting procedure above to attach the pipe thread portion or flange mounting portion as applicable.
2. Tighten the packing nut until the internal packing is tight enough so that the friction fit on the shaft is adequate to prevent leakage but
not prevent the shaft from sliding. Position the etched flow arrow parallel with the flow (±1° of level) and position the flow arrow so it is
pointing in the direction of the flow.
3. Proceed to insert the probe into the process media line.
4. For medium pressure packing gland only (PGM): Use the adjusting nuts on the all-thread to pull the sensing element into proper predeter-
mined depth position.
5. For medium pressure packing gland only (PGM): Tighten the opposing lock nuts on the all-threads.
6. Tighten the packing nut another half to full turn until tight (approximately 65 to 85 ft-lbs [88 to 115 N-m] torque).
7. Rotate the split ring locking collar to line up with the connecting strap welded to the packing nut. Tighten the two 1/4-28 hex socket cap
screws on the split ring locking collar.
Reverse these steps for removal.
In-line NPT Assembly (FLT93L)
Check the body length of the in-line assembly to make sure the assembly will fit into the process line. See the appropriate drawing in Appen-
dix A to determine the assembly length. The direction of flow is important for proper operation. There is a flow direction arrow on the in-line
pipe that is to point in the direction of flow. See Figure 2-3 for the correct orientation.
If the instrument is a butt weld assembly, be sure to do the following: Remove the circuit board, properly ground the flow element before welding.
Figure 2-3 FLT93L In-Line Flow Element (Shown with 1-Inch MNPT Ports)
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