Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 - Manual (Page 13)

WARNING
Explosion Hazard – Do not remove the clevis. Removing the clevis
violates the warranty.
Care should also be taken when rotating the clevis or indexing the
screw pattern to avoid scratching the flame path or introducing
particulates to the assembly.
Pipe Connections
The standard pipe connection for the HFG2.0 is per SAE J518, -32
(2 inch), code 61. The valve bodies contain locking helical inserts. Contact
Precision Engine Controls for other connection options.
Note: To maintain flow control accuracy, ten-(10) pipe diameters
(15 inches) straight length minimum is recommended
upstream and downstream.
Flange Bolts
Precision Engine Controls Corporation recommends SAE Grade 5 or
better flange bolts. Torque to 650 – 800 in-lb.
CAUTION
Do not over-torque fittings. Over-torque may result in stripped
threads and/or helical insert damage.
Drain Plug
PECC recommends 60 – 65 in-lb of torque for the drain plug (see
Figure 1-6, View B-B).
Note: The one-piece housing version of the HFG2.0 does not
have a drain hole.
INSTALLING THE HFG2.0 7