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How it works
HON 512 with HON 650 pilot user manual
Gas pressure regulators consisting of an HON 512 actuator assembly combined with an HON
650 pilot can be used to maintain the outlet pressure constant within set limits within a gas
regulating line regardless of gas discharge changes and inlet pressure changes. Connection
lines are used to connect the pilot both to the actuator assembly's inlet pressure and to the
outlet pressure downstream of the actuator assembly within the gas regulating line. The
actuator assembly's degree of opening is used to control the outlet pressure at the actuator
assembly. When closed, the gas will be prevented from flowing through the actuator assem-
bly and, accordingly, within the gas regulating line. The gas pressure regulator works on a
purely pneumatic basis and does not require any external energy.
Gas pressure regulator open
▪ The pilot's control stage (1) is used to build up a
motorization pressure in the body chamber (4)
behind the diaphragm unit (shown in gray). The
force of this pressure acts on the diaphragm
unit.
▪ In the body chamber (6) upstream of the
diaphragm unit, the force of the outlet pressure
and the force of the installed compression
spring(s) (9) act on the diaphragm unit.
▪ If the force of the motorization pressure is
greater than the forces opposing it, the dia-
phragm unit will be axially displaced towards
the gas inlet side (7), i.e., against the gas' direc-
tion of flow (8).
▪ As a result of this axial displacement, the
diaphragm unit's gas-conveying sleeve (5) will
unblock the gas flow at the valve disc (2).
▪ The actuator assembly's degree of opening will
be dynamically regulated as a result of the
changing motorization pressure on one side of
the diaphragm unit and the changing outlet
pressure on the other side of the diaphragm
unit. This keeps the outlet pressure on the gas
outlet side (3) constant within specific limits.
▪ The limits within which the outlet pressure
must remain are set with the pilot.
The visual position indicator and the optional electrical displacement transducer can be used
to read the device's degree of opening.
Gas pressure regulator closed
▪ If the gas regulating line has a zero flow or
bubble-tight sealing downstream of the gas
pressure regulator, the outlet pressure will rise
all the way to the set upper limit, which is re-
ferred to as the "reseat pressure."
▪ When this reseat pressure is reached, the
pilot's control stage (1), which builds up the
motorization pressure at the diaphragm unit,
will be completely closed.
▪ The motorization pressure in the body chamber
(4) downstream of the diaphragm unit will be
relieved.
▪ In the body chamber (6) upstream of the
diaphragm unit, the force of the outlet pressure
and the force of the compression spring(s) (9)
will now act alone and on one side on the dia-
phragm unit.
▪ The diaphragm unit will be axially displaced
towards the gas outlet side (3) until the
gas-conveying sleeve (5) is pushed onto the
valve disc (2) and no further axial movement in
this direction is possible.
▪ As a result, the gas pressure regulator will be
closed. The gas flow (8) will continue to be
suppressed until gas is discharged again and the
outlet pressure drops as a result, opening the
control stage (1) first and then the actuator
assembly as a result.
Description
16
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