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Supply
Pressure
(psig)
Cylinder Bore (in.)
4 5 6 8 10 12 14
Variable Orifice Number
Up to 50 3334456
51-200 2233455
201-600 2223345
Note: -
-
commencing initial adjustment procedures. Failure to
of the PS-2 spring cartridge.
prior to commencing initial adjustment procedures. Failure
the adjustment screw of the AB control counterclockwise
adjustment screw to seal threads on the cap.
valves will isolate the VRP-CH from the control valve
actuator. This prevents unintended stroking of the control
valve and simplifies setting the VRP-CH.
(discharge) line is open. The discharge line is connected to
desired setpoint pressure. Refer to the original invoice
paperwork supplied with the product for the appropriate
setpoint pressure setting. If the adequate gas pressure
Note:
pressure.
WARNING: DO NOT turn the sensitivity adjustment
drum without first applying a sensing pressure and
initial spring tension on the adjusting screw. If these
forces are not present, one of the two pilot seats will
be “cut” on the internal nozzle due to the pressure
between the seat and nozzle.
Turn the sensitivity adjustment drum to the right (decreasing
scale).
Turn the setpoint adjustment screw on top of the VRP-CH
show equal pressure. Clockwise rotation increases cylinder
top pressure. Turn setpoint adjustment only when pressures
are not equal.
Turn the sensitivity adjustment to set the cylinder top and
(Pc
on the scale) to decrease the cylinder top and cylinder
c) is found using the
VRP-CH Discharge to PRESSURE SYSTEM
(NO Volume Boosters)
Pc= Pds- Pd
VRP-CH Discharge to ATMOSPHERE
(NO Volume Boosters)
Pcs
VRP-CH Discharge to PRESSURE SYSTEM
(EQUIPPED with Volume Boosters)
P= Pds- Pd
VRP-CH Discharge to ATMOSPHERE
(EQUIPPED with Volume Boosters)
Pcs
Variables:
Pc
Pd= Discharge pressure (psig)
Ps= Power gas (supply) pressure
at first. Continue rotating sensitivity adjustment until at least
one of the gauges indicates a pressure equivalent to the
c).
10 and 11 until the proper cylinder output pressures are
simultaneously when the sensitivity drum is turned.
c).
