Bell & Gossett HS 601G Pilot Operated Pressure and/or Temperature Steam Regulators Series 2000 - Manual (Page 4)

19. Install the bypass piping and globe valve (T).
• Use the same size pipe for the bypass piping and
globe valve in the bypass line as the main valve (N)
to allow manual regulation during service of regulator.
• Support piping to remove any stress from the
regulator valve body before connecting to the system.
• Make sure pipes and flanges are properly aligned to
prevent stress on the regulator valve body.
20. Install pipe reducer (S) to increase the pipe size, if
necessary, to meet the velocity requirements.
Use additional reducers when the pipe needs to be
increased more than two pipe sizes.
21. Install a 1/4 NPT pipe tapping (U) at least 10 pipe
diameters downstream in a straight run of the
enlarged pipe for the pressure gauge and feedback
line (for spring and/or air pilots) connection.
Note: For heat exchanger shell applications, it is
recommended that the feedback line and pressure
gauge be installed directly into the heat exchanger
shell.
22. Install pressure relief valve (V) in the downstream
piping as required by codes.
23. Install a tee fitting (W) for pressure feedback line.
24. Install a siphon loop tube (X), petcock (Y) and
pressure gauge (Z) in vertical port of tee fitting (W).
25. Connect system piping to complete the installation.
26. Refer to "Pilot Installation" for pilot mounting and
piping instructions.
PILOT INSTALLATION
Mounting Hardware for Pilot Installation
Kit A – For spring or air pilots only or in combination with
temperature or solenoid pilots.
Kit B – For temperature pilot or solenoid pilot only.
No Part Description Kit A Kit B
1 L-Tubing; from main valve bottom X X
Elbow connection to tee fitting
Branch connection.
2 S-Tubing; from bleed orifice fitting X
to tee fitting on pilot.
3 Nipple, 1/4 NPT x 4" (101mm) X
4 Nipple, 1/4 NPT x 1-1/2" (38mm) (2) X X
5 Union Connection, 1/4 NPT Female X X
6 Tee fitting X X
7 L-fitting X X
8 Bushing X
9 J-Tubing; From bleed orifice fitting X
to tee fitting on pilot.
10 1/8" Tubing connector X X
Hardware Kit Components
1
2
4
3
5
10 7 6
1
9
4
8
5
10
7 6
4