Honeywell HON R100NG Series User And Maintenance Manual page 16

Pilot pressure sections
How the pilot works
User manual for HON R100 gas pressure regulator with HON P095NG pilot
Figure
 The pilot's set screw is used to tighten the pilot spring. The spring, in turn, produces a
force component that acts on the upper diaphragm from above.
 The outlet pressure produces a force component that acts on the upper diaphragm
from below.
 The force components acting on the upper diaphragm are used by the diaphragm in
order to compare the setpoint and the process value. Depending on how the dia‐
phragm moves, a larger or smaller gap between the valve and the motorization pres‐
sure stage will be opened. The motorization pressure is regulated with this gap.
 The inlet pressure is conveyed into the lower chamber of the upstream pressure stage.
This pressure is conveyed into the chamber above the lower diaphragm through the
valve. The pressure reduced by the valve is the loading pressure, which produces a
force component that acts on the lower diaphragm from above.
 The outlet pressure is conveyed into the pilot from the other side. This pressure is con‐
veyed into the chamber below the lower diaphragm unit through a hole in the housing.
There, the outlet pressure produces a force component that acts on the diaphragm
from below.
 The force components acting on the lower diaphragm are used by the diaphragm in
order to compare the setpoint and the process value. Depending on how the dia‐
phragm moves, a larger or smaller gap between the upper valve and the motorization
pressure stage will be opened. The motorization pressure is regulated with this gap.
 Depending on the gas pressure and on the set setpoint, the resulting motorization
pressure will vary.
Color Meaning
Inlet pressure
Loading pressure
Motorization pressure
Outlet pressure
Atmospheric pressure
Description
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