Becker HPP-4 User manual

Instruction Manual
for
the HPP-4
High Pressure
Positioner
Table of Contents
Section Page
Introduction 2
Description 2
Scope of Manual 2
Technical Assistance 2
Applications 3
Guidelines for usage 3
Technical Information 4
Specifications 4
Materials of Construction 4
Accessories 4
Principals of Operation 5
Close on increasing 5
Open on increasing 6
Adjustment Procedure 7
Deadband Setting 8
Bias Adjustment 9
Range Adjustment 10
Section Page
Changing Positioner Action 12
Conversion to Split Range 13
Assembly Procedures Separate Manual
Inspection Procedures 15
Parts Ordering 16
Parts List 16
Seal Kits 16
Appendix –Parts & Mounting detail
Open on increasing (parts) 18
Close on increasing (parts) 19

HPP-4 Positioner
Instruction Manual
Introduction
The Becker HPP-4series positioner
represents a breakthrough in valve con-
trol technology for the natural gas in-
dustry. Built to exacting specifications,
the easily maintained unit offers highly
accurate control with excellent control
characteristics in a broad range of oper-
ating environments. The HPP-4series
positioner is designed such that its
bleed gas can be routed to a lower
pressure downstream or fuel gas sys-
tem, eliminating bleed gas completely.
This means significant savings to your
company in terms of minimizing expen-
sive bleed gas as well as a cost saving
means of minimizing the environmental
impact of atmospheric hydrocarbons
and diminishing natural resources.
Description
The Becker HPP-4positioner is used in
control valve assemblies with a control-
ler or I/P transducer and double acting
actuator to provide accurate flow or
pressure control. The HPP-4 can be
used with various valve types that utilize
a double acting pneumatic piston ac-
tuator. The HPP-4 design positioner
represents Becker’s commitment to
continuos development of new products
and updating of existing products to
maximize their performance while re-
taining simple operation and minimum
maintenance.
Valves over 16” in diameter require the
use of Becker VB-250 Volume boost-
ers.
Scope of Manual
This manual provides information on in-
stallation, operation, adjustment, and
maintenance of the Becker HPP-4po-
sitioner. For information concerning ac-
tuators, valves, and accessories, refer
to the instruction manuals provided with
the specific product.
Note: Only those qualified through training or
experience should install, operate, or maintain
Becker positioners. If there are any questions
concerning these instructions, contact your
Becker sales representative, sales office, or
manufacturer before proceeding.
Technical Assistance
Should you have any questions, you
may contact your local Becker Preci-
sion sales representative or Becker
Precision technical assistance at:
Becker Precision Equipment, Inc.
Attn: Technical Assistance
950 Pratt Boulevard
Elk Grove Village, IL 60007 USA
Toll Free: [phone]
Tel: [phone]
Fax: [phone]
e-mail: [email protected]
HPP-42September 1999

Applications
•Primary Pressure Control
•Overpressure Protection (Monitor)
•Underpressure Protection
(Standby)
•Relief Valve
•Backpressure Control
•Power Plant Type Applications*
•When Unique "Bleed to Pressure
System" BPS™feature can be
utilized
•Any large downstream systems
(city gate stations, inter-system
pressure limiting)
•Suction control to reciprocating
compressors*
•Double-stage cut (working moni-
tor regulator*
•High Gain systems that require
fast stroking speed (power plants,
fertilizer plants)*
Guidelines for Usage
Large Volume Control Valve Actuators:
Control Valves that require large volume
actuators may require Model VB-250
Volume Boosters to ensure adequate
stroking speed. Volume Boosters are
typically required for Becker RPDA and
LPDA Series actuators size 12T or larger
(2200 in3)
Bleed to Pressure System: The HPP-4
Positioner is typically utilized for applica-
tions with a discharge pressures of 350
psig or less in order to ensure adequate
speed of operation. Bleed to pressure
system eliminates atmospheric emis-
sions by keeping discharge gas in the
piping system.
High Gain Systems: Power plant feeds
and other similar systems require fast
stroking speed in order to satisfy re-
quired “gain” of the system. The VB-250
Volume Boosters are applied based
upon actuator size and required stroking
speed.
CVE Globe Pattern Control Valves: The
Becker HPP series positioners are com-
patible with the Globe style control valve,
but require a minimum of 2” of actuator
stroke for proper feedback and opera-
tion. This makes it impossible to use
this positioner with most globe valves
smaller than 4” port size.
Compatible Actuators:
•Becker RPDA Actuators (Rotary Pis-
ton Double-Acting)
•Becker LPDA Actuators (Linear Pis-
ton Double-Acting)
•Other manufacturer’s double-acting
piston actuators*
*consult Becker for additional informa-
tion
Retrofit Compatibility:
Optimum performance is achieved by
pairing the HPP-4 with genuine Becker
control valve actuators. Should you al-
ready have existing control valve actuator
(s) in service, the addition of a Model
HPP-4 can improve performance and
eliminate atmospheric bleed emissions if
using the BPS (Bleed to a pressure sys-
tem) feature.
Some Compatible Actuators:
•Bettis T-Series Piston Actuators
•Fisher Type 470 Piston Actuators
•Fisher Type 1061 Piston
HPP-43September 1999
HPP-4 Positioner
Instruction Manual

Maximum Supply Regulator Capacity
Q = Min. Supply Regulators Capacity (scfh)
G= Specific Gravity of Gas
T= 460 + Operative Temperature (°F)
Cv = Flow Factor
P1= Supply Pressure to Positioner (psig)
Accessories
•Atmospheric Bleed Control (AB Control):
maintains minimum pressure differential
across the cylinder. The AB Control is re-
quired in order to provide the necessary
output to operate the control valve under all
design conditions.
•PS Series Non-Bleed Sensor: achieves
non-bleeding conditions in either full open
or full closed positions. Selection based
upon power gas pressure and discharge
gas pressure.
Input Signal: Standard: 3-15 psi or 6-30 psi.
Adjustable: Zero is adjustable from 2-
30 psig, span is adjustable from 5-24
Output Signal: Pneumatic pressure as required by the
actuator up to full supply pressure.
Loss of Signal: Reverse Acting: Open on loss of signal.
Direct Acting: Close on loss of signal.
Connections: All Ports: ¼” N.P.T.
Action: Direct and Reverse Acting:. Field-
reversible
Performance: Resolution: 0.2%
Hysteresis: 1.0%
Flow Capacity: CV= 1.5
Steady State
Consumption:
See Table in Appendix
Power Gas Require-
ment:
Use clean, dry filtered (100 micron)
gas.
Discharging to Atmosphere:
250 psig maximum.
Operative Temperature
Limits:
-20 to 160°F
(-28 to 70°C).
Housing: Meets NEMA 3 classification (weather
tight).
Installation Orienta-
tion:
Vertical or horizontal position allow-
able.
Approximate Weight: 15 pounds.
External Parts: Anodized 2024 Aluminum
Internal Parts: 316 Stainless Steel and 2024 Ano-
dized Aluminum
Feedback Lever: 316 Stainless Steel
Range Spring: Plated Music Wire
Diaphragms: Buna-N with Nylon Reinforcement
Seats and O-Rings: Buna-N
Tubing: 316 Stainless Steel
Fittings: 316 Stainless Steel
Gauges: 2 ½” Dial Liquid filled Brass Con-
nection with Stainless Steel Case.
(Stainless Steel connection op-
HPP-4 Positioner
Specifications
Technical Specifications Materials of Construction
HPP-44September 1999
Q = 312.86 x P1x CVx
)( 460
1
+× TG

Principles of Operation
Close on Increasing Signal
The positioner is a force-balanced instrument that provides a control valve posi-
tion proportional to the pneumatic input signal. The control valve will open on loss
of input signal. The energy to operate the control valve is obtained from the differen-
tial between the supply and discharge pressures. In steady state, the forces im-
posed on the balance beam by the input signal diaphragm and the range spring are
equal; therefore, the distance between the top and bottom seats and nozzles in the
positioner is equal. This causes the cylinder top and bottom pressures to be equal,
and the control valve is stationary. An increase in the input signal pressure results
in the lower seat being pushed into the lower nozzle due to an imbalance in the
beam forces. At the same time, the top seat moves away from the top nozzle.
This increases the pressure in the cylinder bottom, while the pressure in the cylin-
der top decreases. The control valve begins to close. The actuator rod stretches
the range spring, increasing its tension. This force, which opposes the force on the
balanced beam caused by the increasing input signal, continues to increase until
the balance beam forces are in equilibrium. At this point the valve is in the correct
position for the applied input signal. The positioner’s sensitivity adjustment effects
the responsiveness of the positioner nozzles. The greater the seat and nozzle sen-
sitivity, the greater the accuracy of the positioner.
HPP-45September 1999
Power Gas and Cylinder Bottom
Cylinder Top
Exhaust
Instrument Signal
HPP-4 Positioner
“How-It-Works”

Open on increasing Signal
The positioner is a force-balanced instrument that provides a control valve posi-
tion proportional to the pneumatic input signal. The control valve will close on loss of
input signal. The energy to operate the control valve is obtained from the differential
between the supply and discharge pressures. In steady state, the forces imposed on
the balance beam by the input signal diaphragm and the range spring are equal;
therefore, the distance between the top and bottom seats and nozzles in the posi-
tioner is equal. This causes the cylinder top and bottom pressures to be equal, and
the control valve is stationary. An increase in the input signal pressure results in the
upper seat being pushed into the upper nozzle due to an imbalance in the beam
forces. At the same time, the bottom seat moves away from the bottom nozzle.
This increases the pressure in the cylinder top, while the pressure in the cylinder bot-
tom decreases. The control valve begins to open. The actuator rod stretches the
range spring, increasing its tension. This force, which opposes the force on the bal-
anced beam caused by the increasing input signal, continues to increase until the
balance beam forces are in equilibrium. At this point the valve is in the correct posi-
tion for the applied input signal. The positioner’s sensitivity adjustment effects the
responsiveness of the positioner nozzles. The greater the seat and nozzle sensitiv-
ity, the greater the accuracy of the positioner.
HPP-4 Positioner
“How-It-Works”
Power Gas and Cylinder Bottom
Cylinder Top
Exhaust
Instrument Signal
HPP-46September 1999

Your HPP-4 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.
HPP-47September 1999
SUPPLY
PRESSURE
(psig)
CYLINDER BORE (IN.)
456810 12 14
VARIABLE ORIFICE NUMBER
Up to 50 3334456
51-200 2233455
201-600 2223345
Important Note: For HPP-4 equipped with VB Series Volume Boosters, set variable orifices between 1 and 2
regardless of the cylinder size. Steady state gas consumption is minimized at 1. For additional information
on VB Series Volume Boosters refer to Accessories section of this manual.
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.
2. Adjust the adjustable orifices:
The adjustable orifices are utilized to
control the volume of gas that is sup-
plied to the HPP-4.
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. Set
both orifices according to the table be-
low.
Notes:
•If the HPP-4 is NOT equipped with
VB Series Volume Boosters, set the
variable orifices to the recom-
mended value per the Table below.
If equipped with volume boosters,
see note below the table. To deter-
mine 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 8"
bore). If equipped with a PS sensor
HPP-4 Positioner
Adjustment Procedures

6. If the actuator is equipped with an
MCV-3 Manual Control Valve), place
the left MCV-3 handle in the manual
position. If the actuator is not
equipped with an MCV-3, use the
block valve (1/4 “ ball valve) installed
between the positioner output and
the actuator. Once the actuator has
reached its desired position (based
on the mid-signal applied to the in-
strument port –Step 5), place the
block valve in the closed position.
7. Final Sensitivity Drum Adjustment
Turn the Sensitivity Adjustment to set
the Cylinder Top and Cylinder Bottom
at the proper Cylinder Balance Pres-
sure (Pc) - See Equation 1 and 2 below.
Turn Sensitivity Adjustment to the right
(decreasing numbers on the scale) to
increase the Cylinder Top/Cylinder Bot-
tom Pressures. Turn Sensitivity Adjust-
ment to the left (increasing numbers on
the scale) to decrease the Cylinder Top/
Cylinder Bottom Pressures.
The correct Cylinder Balance Pressure
(Pc) is found using the Cylinder Balance
Pressure equations:
HPP-4 Discharge to PRESSURE SYS-
TEM (NO Volume Boosters)
Pc= Pd+ [0.4*(Ps-Pd)] (Equation 1a)
HPP-4 Discharge to Atmosphere (NO
Volume Boosters)
Pc= 0.4*Ps(Equation 1.b)
Deadband Setting
1. Turn the deadband adjustment drum
in the direction of decreasing the
numbers until the drum can no
longer turn. Then turn the adjust-
ment drum one full turn in the oppo-
site direction (use the numbers on
the drum as a guide).
2. If not already attached, wind 3-4
coils of the range spring onto the re-
tainer.
3. If not already adjusted, set the bias
adjustment screw in the middle of
its travel range.
4. Apply power gas to the HPP-4 posi-
tioner
5. Set the instrument signal pressure
at the midpoint of its range (e.g.. 9
psig for a 3-15 psig range, 18 psig
for a 6-30 psig range). Allow the ac-
tuator to stroke the valve to an inter-
mediate position and the gauge
pressures to balance. (if the valve
does not stroke, insure that the po-
sitioner is communicating with the
actuator cylinder. If equipped with
an MCV-3, make sure the MCV-3
left handle is in automatic.
Signal Line from Control-
HPP-48September 1999
HPP-4 Positioner
Adjustment Procedures

HPP-4 Discharge to PRESSURE SYS-
TEM (EQUIPPED with Volume Boost-
ers)
Pc= Pd+ [0.2*(Ps-Pd)] (Equation 2.a)
HPP-4 Discharge to ATMOSPHERE
(EQUIPPED with Volume Boosters)
Pc= 0.20*Ps(Equation 2.b)
Variables:
Pc = Cylinder Balance Pressure (psig)
Pd = Discharge Pressure (psig)
Ps = Power Gas (Supply) Pressure
Note: When increasing or decreasing
the instrument signal, the output pres-
sure should swing up and down. When
changing direction of the false instru-
ment signal, the output pressure should
immediately reverse direction. Any
“bump” or initial reaction of the gauge in
the wrong direction indicates friction
(requiring the unit be rebuilt to eliminate
the friction).
8. Place the instrument signal to auto-
matic and open the block valves or
return the left handle of the MCV to
automatic.
HPP-4 Positioner
Bias Adjustment
Bias Adjustment
For Standard (Non-split range) Sys-
tems:
1. To increase the bias setting, in-
crease tension on the range spring.
This is accomplished by either rais-
ing the spring retainer or screwing
the bias adjustment stud into the in-
dicator bar or tail rod. Note the two
jam nuts tightened against one an-
other to adjust the length of the
stud. When properly adjusted,
tighten the bias lock nut(s).
2. In order to decrease the bias set-
ting, decrease tension on the range
spring by either lowering the spring
retainer or screwing the bias adjust-
ment stud out of the indicator bar or
tail rod. Note the two jam nuts tight-
ened against one another to adjust
the length of the stud. When prop-
erly adjusted, tighten the bias lock
nut(s).
For Split Range Systems (see Table 1 )
3. Find the bias adjustment screw (1/2-
20 thread with 3/8 flats) on the end
of the positioner opposite the pneu-
matic signal input port. Loosen the
jam nut located on the adjustment
screw.
4. To increase the bias setting, tighten
the adjustment screw.
5. To decrease the bias setting, loosen
the adjustment screw.
6. Holding the adjustment screw in
place, tighten the jam nut against
the positioner body.
Span Adjustment
Spring Lock
Balanced Beam
Proportional Topworks
Bias Lock Nuts (Qty. 2)
Spring Retainer
Bias Adjustment
HPP-49September 1999

HPP-410 September 1999
Spring Range
Green (20-2592) 1-6
Silver (25-1038) 2-11
Blue (25-1036) 4-20
Red (25-1037) 8-30
Table 1: Adjustable Bias Springs
HPP-4 Positioner
Range Adjustment
Range Adjustment
Note: There will be some interaction between
range and bias adjustments. It may therefore
be necessary to readjust the bias and re-check
the range after completing the following steps.
The range, or the amount of travel be-
tween the lower and upper limits of the
input signal, is set with the range
spring. This range will typically be 12
psi for a 3-15 psi system or 24 psi for a
6-30 psi system. The limits of the range
can be defined as the initial point at
which the instrument signal
to the HPP-4starts valve
movement until the end of
the valve stroke and full
pressure differential across
the cylinder output gauges.
1. After setting the bias for
the start of the valve travel,
continue increasing the in-
strument signal until the
valve strokes is completed AND the
cylinder output gauges show full
power gas pressure differential.
2. Be sure not to overshoot at this
point as any signal level above this
upper limit will show the same read-
ing on the cylinder gauges. This
point is the highest end of the range
and the value may not necessarily
be equal to the desired upper range
value.
Note: For intermediate ranges, use the next
size range spring.
Stroke (Part Number)
46812
601-6288 01-6287 01-6287 01-6801
12 25-1151 25-1152 25-1153 25-1154
18 25-1599 25-1600 25-1601 25-1602
24 25-1218 25-1219 25-1220 25-1221
Spring Range
(psi)
Table 2: Range Spring Configurations

3. If the range is less than desired (i.e.
the actuator reaches its full travel in
less than the specified input range),
strengthen the range spring by
winding it counterclockwise onto
the spring retainer.If the range is
greater than desired, weaken the
range spring by winding it clock-
wise. Repeat adjustments until the
desired range provides full or zero
output pressure.
4. If the desired range is not achieved
after making the above adjust-
ments, readjust the bias (per the
previous instructions) to allow
proper range adjustment.
5. It may be necessary to change the
range spring retainer for some non-
standard ranges (refer to Table 3).
HPP-411 September 1999
Table 3: Range Spring Retainer
Type Typical Use
Short (01-2509 ) 8” and 12” Stroke
Intermediate (11-2572 ) 6” Stroke
Long ( 01-2042 ) 4” Stroke
HPP-4 Positioner
Range Adjustment

Changing Action of Positioner
To change the positioner from open on in-
creasing signal to close on increasing sig-
nal, or vice versa, the following parts kits
must be ordered:
To change open on increasing to close on
increasing: Part #25-1444 plus an Exten-
sion Rod (item #13 in drawing 35-0516,
see Table 4). The serial number of the ac-
tuator must be specified. The exact part
number of the extension rod will vary
based on the actuator stroke.
To change close on increasing to open on
increasing: Part #25-1289. Note: If con-
verting a close on increasing signal posi-
tioner to open on increasing signal, the
wide end of the tube (item #9) may be
shortened by 11/16" with a hack saw in
place of ordering part #25-1289.
The stroke length of the actuator cylinder
MUST be specified when ordering the
above part numbers. If the actuator serial
number cannot be found, the stroke length
can be found in the regulator model num-
ber. The stroke length is the first letter af-
ter the "H" in the model number. For ex-
ample model 10H12L6FG-SR-S-HSB-
40/35-100-O has a stroke length of "L", or
12 inches ["L" is the 12th letter in the al-
phabet]).
Refer to the drawings 35-0515 and 35-
0516 in the Appendix for the following:
1. Disconnect all supply lines, instrument
line, and output line from the posi-
tioner.
2. Remove the range spring (item #4) at
both ends and those items connecting
it to the rod (item #23) and the posi-
3. Remove the positioner from the
bracket (item #18). The tubing and
fittings on each side of the positioner
must be taken off and installed in the
opposite corner from their original po-
sition (see piping schematic provided
by Becker Precision Equipment) then
reattached to the positioner. This will
allow the positioner to maintain the
actuator failure mode when the posi-
tioner is turned upside down.
4. Move the bracket assembly (item
#18), tube assembly (items #16 and
#17), and cover plate (item #11) to
the positions shown on the desired
drawing.
5. Install the positioner in the opposite
of its original position (upside down if
it was right side up, right side up if it
was upside down).
6. Using parts from the factory kit, as-
semble the spring and surrounding
hardware according to the drawing of
the desired configuration. (Note: all
original parts may not be used when
converting from close on increasing
to open on increasing).
7. The entire bracket assembly (item
#18) or the outer angle may need to
be turned upside down to accommo-
date the new spring height.
8. Reconnect the supply, instrument,
and output lines according to piping
schematic supplied.
Note: The flow direction must be main-
tained through the positioner bodies
when re-piping. (I.e. the flow [supply or
exhaust] moves from P1 to P2 and P3 to
HPP-412 September 1999
HPP-4 Positioner
Positioner Action

Conversion to Split Range
Converting a standard positioner to a
split range positioner (pneumatic input
other than 3-15 psi or 6-30 psi), requires
ordering the proper conversion kit from
the factory. This kit will include a bias
spring and bias spring cartridge. If re-
quired, it will also contain a new range
spring and mounting spacers.
1. For close on increasing positioner:
Remove the cap on the top of the po-
sitioner along with the spring inside
it.
For open on increasing positioner:
Remove the mounting bracket hold-
ing the cap on the bottom of the posi-
tioner. Then remove this cap along
with the spring inside it.
2. Replace the cap and spring with the
larger bias spring cartridge and bias
spring found in the kit. Make sure
the bias adjustment screw in the
bias spring cartridge is snug against
the bias spring and the spring is cen-
tered before tightening the spring
cartridge.
3. For open on increasing positioner:
Remove the washer and jam nut from
the adjusting screw in the bias spring
Stroke Close on
Increasing
Open on
Increasing
Reference
Drawings
4” 25-6014 25-1464 Proportional:
35-0513
35-0313/A
35-0511
35-0511/A
Tailrod
Mount:
6” 25-6014 25-1465 Proportional:
35-0522
8” 25-6014 25-1466 Tailrod:
Table 5: Split Range Conversion Kits
Note: Refer to Table 1 and Table 2 for
Bias and Range Spring part numbers.
Stroke With Without
425-8265 25-8001
625-8136 25-1093
825-1402 25-1423
Table 4: Extension Rods for Positioners to
Close on Increasing Signal
3. (Cont.) Reattach the mounting
bracket upside down from its original
position.
4. Slide the thread spacer (brass
bushing) over the adjusting screw
and tighten the washer and jam nut
against the thread spacer.
5. If a range spring was sent with the
kit, remove the existing range spring
and replace it with the new one.
6. Adjust the unit per the Adjustment
Procedures.
HPP-413 September 1999
HPP-4 Positioner
Split Range

Maintenance and Inspection
As with all precision equipment, it is
necessary to periodically test the posi-
tioner to ensure optimum performance.
We recommend the following proce-
dure once a year.
1. Shut off supply pressure and bleed
down at positioner. Note the set-
tings of the variable orifices and re-
move them from the orifice assem-
bly. Clean them thoroughly and re-
install using new o-rings, being sure
to install each orifice in the same
hole from which it was removed (the
orifice and block have matching
numbers for this purpose). Reset
orifices to original settings. Turn on
supply pressure.
2. Apply a midrange signal to the posi-
tioner. Allow the control valve to be-
come stationary at about 50% of the
range. Close the cylinder block
valves or move the MCV-3 handle to
the manual position. The positioner
is now isolated from the cylinder.
Apply a ± ¼ PSIG signal change.
Observe the response in the output
gauges. The output pressure
should develop differential pressure
equal to at least 20% of the power
gas pressure. If the output pressure
does not show immediate response,
the positioner nozzles may not be
adjusted properly. See the adjust-
ment instructions to calculate the
correct balance pressure. Reduce
the output pressures by turning the
drum in the direction of increasing
numbers.
If the pressures do not respond in the
correct direction when reversing the in-
strument signal change, the unit has
internal friction. Disassemble the unit
and replace all rubber goods.
3. Check the integrity of the balanced
valve seats by increasing the dead
band by 1 full number. When the
cylinder top and bottom gages are
equal to the power gas, the exhaust
port should not exhibit any bleed
gas. If either of these tests fail, then
the positioner is not properly ad-
justed or the unit needs to be reas-
sembled with new rubber goods.
4. Soap test around all diaphragm in-
terfaces, orifice assemblies and
vents. If any leaks are found around
the diaphragms, refer to the assem-
bly instructions for replacement of
all internal rubber parts.
5. Observe the operation of the
gauges. If any gauges are defective,
replace them.
6. Check range and bias. If neces-
sary, readjust per Adjustment Pro-
cedures.
Should problems arise or more infor-
mation is required, call toll free (800)
323-8844 for assistance
HPP-4 Positioner
Maintenance and Inspection
HPP-414 September 1999

HPP-4 Positioner
Maintenance and Inspection
HPP-415 September 1999HPP-415 September 1999
Model HPP-4 Single-Acting Positioner Annual Maintenance Checklist
1. __________ Soap test all diaphragm mating surfaces to check for leaks.
2. __________ Replace rubber goods utilizing Becker Model HPP-4 Single-Acting Posi-
tioner Repair Kit (Part # 30-9501) if necessary.
Refer to Pages 12-17, HPP-SB Assembly Procedures.
3. __________ Confirm Power Gas Supply Pressure is correct.
Refer to original Becker invoice paperwork for proper power gas setting.
4. __________ Observe operation of gages and replace if defective.
5. __________ Check integrity of HPP-4 positioner seats. Varying input signal 1 psig
should send one cylinder output gauge to full power gas.
Refer to Procedure 7 note, pages 9, Adjustment Procedure.
6. __________ Check response of HPP-4 positioner. Varying input signal 1/4 psig
should produce cylinder output gauge differential equal to 40% of
power gas.
Refer to Procedure 6-8, pages 8-9, Adjustment Procedure.
7. __________ Check range and bias of HPP-4 positioner and adjust if necessary.
Refer to Pages 9-11 of adjustment procedure.
8. __________ Inspect and Verify Proper Operation of all HPP-4 Positioner Accesso
ries.
Refer to technical manual included with each specific instrumentation ac-
ces-sory for further instruction.
Note: It is not necessary to replace any rubber goods in Becker
instrumentation or instrumentation accessories on a regular basis. However, common
practice suggests that replacement of rubber goods on a 5-year cycle basis provides
adequate preventative maintenance.

Parts Ordering
The following is provided to allow the ordering of replacement parts. Please specify the Becker
instrument serial number when ordering parts (this can be found on the Stainless Steel tab at-
tached to the pilot by the 7/16 hex head cap screws. If the instrument was supplied as a com-
plete valve regulator package, the Stainless tag attached to the actuator piston can also provide
the serial number. See Drawing #30-0501
HPP-416 September 1999
Key Description Part No.
1Pilot base 30-7005
2Lexan Cover 25-1034
3Adjusting Drum 35-1520
4Washer 25-1016
5Inside piston 25-8247
6Orifice Assembly 35-1015
7Nozzle 1/8” 25-1030
81/2-20 Jam Nut 98-3056
9Beam Adjusting Drum 25-1124
10 Diaphragm 25-1213
11
12
13 1/8 Roll Pin SS 98-2950
14 8-32 x 1” SHCS 98-3144
15 Beam Block 25-1086
16 Outside piston 25-1018
17 3/16 x 1/2 Roll Pin SS 98-3089
18 1/4-20 x 2-1/2 HHCS 98-3180
19 Gauge Manifold 35-1013
20 O-Ring –012 95-2615
21 1/4-28 Jam Nut 98-3214
22 Diaphragm w/ Convolute 25-1027
23 Beam Spacer 30-7055
24 1/4-20 x 1” HHCS 98-2579
25 3-15 pressure cartridge 25-1082
26 5-40 x 1/4 SHCS 98-2629
27 1/4-20 x 3/4 SHCS 98-3137
28 8-32 x 1/2 SHCS 98-2614
Seal Kit
A seal kit containing diaphragms, o-
rings, and seats, for the HPP-4 posi-
tioner is available directly from Becker.
Simply contact Becker Precision Equip-
ment and order part number 30-9501
HPP-4 Positioner
Parts List
Key Description Part No.
29 Pilot Post S.S. 25-8249
30 Double pilot Body 25-8246
31 Valve Adjusting Screw 25-8248
32 O-Ring –014 95-2632
33 O-Ring –010 95-2609
34 Buna –N Seat 25-1031
35 S.S. Control Tag 25-1061
36 Beam 25-1084

HPP
-
4 Positioner
Parts List
HPP-417 September 1999

HPP-4 Positioner
Appendix
HPP-418 September 1999

HPP-419 September 1999
HPP-4 Positioner
Appendix