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Pilot pressure
sections
How the pilot works
HON 512 with HON 650 pilot user manual
The HON 650 pilot is subdivided into the following pressure sections:
Figure
Load limiting stage and control stage:
Base plate:
▪ The gas pressure being regulated is conveyed into the upper segment of the control
stage and produces a force component that acts on the double diaphragm system in
the control stage's center segment from above.
▪ The control stage's spring adjuster is used to tighten the pilot spring, producing a force
component that acts on the control stage's double diaphragm system in the control
stage's center segment from below.
▪ The force components being exerted on the control stage's double diaphragm system
are used by the system in order to compare the setpoint and the process value. De-
pending on the gas pressure and on the set setpoint, the position of the double dia-
phragm system position inside the control stage will vary slightly. This position change
will result in a small/large gap between the stationary nozzle and the deflector plate
being cleared inside the double diaphragm system. At the nozzle, there will be gas with
the loading pressure generated in the load limiting stage (in the case of the two-stage
pilot version) or with the inlet pressure (in the case of the single-stage pilot version).
The dynamically regulated gap between the nozzle and the deflector plate is used to
build up the motorization pressure inside the control stage's double diaphragm system.
▪ The motorization pressure generated inside the control stage is delivered to the actua-
tor assembly via a connection line.
▪ The optional load limiting stage works in a manner similar to the control stage. The
loading pressure built up in this case is generated with the inlet pressure's auxiliary en-
ergy.
▪ The pilot's amplifying valve is used to set the speed of the motorization pressure
changes.
Color
Meaning
Inlet pressure
Motorization pressure
Loading pressure (not part of
single-stage pilot version)
Outlet pressure
Atmospheric pressure
Description
18
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