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Your HPP-5 positioner will come factory
adjusted for your particular application.
The use of the adjustment procedures
will be necessary upon installation of a
rubber goods replacement kit or any
other disassembly or reassembly of
the positioner.
Adjustment Procedure
The sensitivity adjustment drum on one
end of the positioner determines the
sensitivity of the unit.
The variable orifices determine the
stroking speed of the positioner.
Initial Adjustment
1. Adjust the supply regulator:
Adjust the supply regulator to the de-
sired Power Gas pressure. Refer to the
original invoice paperwork supplied
with the product for the appropriate
Power Gas pressure setting. It is im-
perative that adequate supply gas pres-
sure be supplied to the VRP-CH in or-
der to ensure proper operation of the
system and all accessories.
Table A – Exhaust vented to Atmosphere
SUPPLY
PRESSURE
(psig)
Up to 50
51-200
201-600
SUPPLY
PRESSURE
(psig)
Up to 50
51-200
201-600
HPP-5
4
5
3
3
2
2
2
2
Table B – Exhaust vented to Pressure System
4
5
3
3
4
4
2
2
2. Adjust the adjustable orifices:
The adjustable orifices are utilized to
control the volume of gas that is sup-
plied to the HPP-5.
The stroking speed of the system is
proportional to the numerical value of
the adjustable orifice. Adjustable ori-
fice settings are typically equal for both
orifices. However, a few applications
may require unequal settings for each
adjustable orifice. Refer to Fine Tuning
for more information on utilizing une-
qual adjustable orifice settings.
both orifices according to the table be-
low.
Notes:
•
To determine the cylinder bore, look
at the model number stamped on
the stainless steel tag on the top of
the cylinder. The cylinder bore will
be the first number following the first
capital letter "H". This one or two
digit number following the first "H"
will be the diameter in inches and
will be followed by another letter
(For example, a unit with the model
number 6H8F6FG-H4 has an
CYLINDER BORE (IN.)
6
8
VARIABLE ORIFICE NUMBER
3
4
3
3
2
3
CYLINDER BORE (IN.)
6
8
VARIABLE ORIFICE NUMBER
3
4
4
5
2
3
7
HPP-5 Positioner
Adjustment Procedures
Set
10
12
14
4
5
6
4
5
5
3
4
5
10
12
14
4
5
6
5
6
6
3
4
5
September 1999
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