Honeywell HON 5020 Assembly page 30

Overview
Establishing the depres-
surized status
Protecting the pipe con-
nections from being
twisted
Purging the lines with
nitrogen
HON 5020 gas pressure regulator
Schematic diagram using the imperial system HON 640a as an example:
The numbers have the following meaning:
No. Meaning
1 Inlet stop valve armature
2 Gas pressure regulator
3 Pressure gauge
4 Outlet stop valve armature
5 Valve for blowdown line
6 Blowdown line
Proceed as follows:
Step Description
1 Close the outlet stop valve armature (4).
2 Close the inlet stop valve armature (1).
3
Depressurize the pilot:
Turn the set screw on the pilot clockwise until the pressure in the regulator is equalized.
4 Open the valve (5) in the blowdown line (6) to discharge the pressure between the inlet
and the outlet valves.
When conducting work involving the pipework, please always observe the following:
Figure
All the gas pressure regulator's lines must be purged with nitrogen before the device is re-
moved.
Storage, removal, and disposal
Description
Do not twist the pipe connections in the assemblies.
Use a second spanner wrench for securing when
loosening and tightening pipe joints.
30