VRG Controls VGP Series User manual

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 1 of 33 DECEMBER 2020
VRG Controls LLC. 1 of 32 JANUARY 2019
VGP-SN Valve Gas Posioner
Instrucon Manual
Applicable Models:
This instrucon Manual applies to the following VRG-Valve Gas Posioner. To conrm suitability
for addional models and/or components, please contact VRG Controls or view us online at
www.vrgcontrols.com.
VGP-100-DA-SN VGP-100-DA-SN-SPL
ADDRESS: VRG Controls, LLC.
1199-B Flex Court
Lake Zurich, IL 60047, USA
TOLL FREE: (800) 844-FLOW-VRG
FAX: [phone]
E-MAIL: [e-mail]
WEBSITE: vrgcontrols.com
STAY IN TOUCH!
Scan the QR Code at right
for company informaon
and product updates.
PATENT NO.:
US 9,400,060 B2
PATENT NO.:
US 9,400,060 B2
US 10,234,047 B2

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 2 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 2 of 32 JANUARY 2019
SECTION DESCRIPTION PAGE
1Scope of Manual 3
2Technical Specicaons 4
3 Model Number Explanaon 5
4 Flow Calculaons 6
5VGP Valve Gas Posioners Bias and Spring Range Conguraons 7
6 Principles of Operaon for Double Acng Posioners 9
7 Assembly Guide For:
• VGP-100-DA-SN (CI) [Part Number: PA-0170]
• VGP-100-DA-SN SPL (CI) [Part Number: PA-0171]
10
8Assembly Guide For:
• VGP-100-DA-SN (OI) [Part Number: PA-0175]
• VGP-100-DA-SN SPL (OI) [Part Number: PA-0176]
11
9Changing the Acon of the VGP-DA-SN 12-16
10 Adjustment Procedures 17-19
11 Piping Diagrams 20-28
12 Repair Kit 29
13 Factory Quality Checklist 30
14 Annual Maintenance Checklist 31
and Volume Booster
-8

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 3 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 3 of 32 JANUARY 2019
SCOPE OF THIS MANUAL
This Instrucon Manual provides instrucon
for installaon, maintenance, adjustment and
troubleshoong of VRG Controls VGP - Valve
Gas Posioner. This product is typically ulized
in conjuncon with control valves, pneumac
actuators and a variety of other axillary devices
and accessories. For informaon on products
other than those manufactured by VRG Controls,
please consult the appropriate manufacturer.
WARNING:
Only those qualied through training or experience
should install, operate, or maintain VRG Controls
posioners. If there are any quesons concerning
these instrucons, contact your VRG Controls sales
representave, sales oce, or manufacturer before
proceeding.
DESCRIPTION:
The VGP Valve Gas Posioner represents a
breakthrough in Valve Control technology. The VGP
provides a modular, plug & play control system for
use in conjuncon with pneumacally actuated
control valves. The VGP features a simplied 5-in-1
conguraon that provides compability with double
acng and single acng (spring return) control valves
ulizing a single plaorm. The VGP may be easily
recongured in the eld to provide compability
with almost any pneumac control valve on the
market. The highly accurate performance and ZERO
emissions capabilies of the VGP provide the desired
features to meet natural gas industry needs. The VGP
was designed by the inventor of the original “Valve
Gas Posioner” and features patent US 9, 400, 060
B 2 technological advances that provide reliability,
convenience, and performance above and beyond
previous technologies. VGP- Valve Gas Posioners
represent the future of control valve control
technology and are backed up by the industries’ most
experienced team.
TECHNICAL ASSISTANCE
For technical assistance with VRG products, please
contact your local VRG Controls sales representave
or VRG Controls direct. In order to facilitate technical
assistance, we strongly recommend that you obtain the
MODEL NUMBER and SERIAL NUMBER of the product for
which you require assistance prior to contacng us. The
MODEL NUMBER and SERIAL NUMBER may be found on
the PRODUCT ID LABEL located on the front of the VGP
product on the center face of lower poron of the power
assembly.
APPLICABLE MODELS:
This instrucon Manual applies to the following VRG-
Valve Gas Posioners. To conrm suitability for addional
models and/or components, please contact VRG Controls
or view us online at www.vrgcontrols.com.
• VGP-100-DA-SN
• VGP-100-DA-SN-SPL
NOTES ON TABLE 1.0:
• ZERO Steady State emissions achieved when
VGP properly adjusted to exhibit factory advised
deadband seng.
• Consumpon is approximate and based upon 100
psig Supply Gas. Atmosphere emissions may be
completely eliminated with Discharge to Pressure
System incorporated.
• Double acng VGP’s require addion of No-Vent
Device to achieve ZERO emissions at full open
and full closed.
SCOPE OF THIS MANUAL
This Instruction Manual provides instruction for instal-
lation, maintenance, adjustment and troubleshooting
of VRG Controls VGP - Valve Gas Positioner. This
product is typically utilized in conjunction with control
valves, pneumatic actuators and a variety of other axil-
lary devices and accessories. For information on prod-
ucts other than those manufactured by VRG Controls,
please consult the appropriate manufacturer.
Warning:
Only those qualied through training or experience
should install, operate, or maintain VRG Controls posi-
tioners. If there are any questions concerning these in-
structions, contact your VRG Controls sales represen-
tative, sales o󰀩ce, or manufacturer before proceeding.
DESCRIPTION:
The VGP Valve Gas Positioner represents a break-
through in Valve Control technology. The VGP pro-
vides a modular, plug & play control system for use in
conjuction with pneumatically actuated control valves.
The VGP features a simplied 5-in-1 conguration that
provides compatibility with double acting and single
acting (spring return) control valves utilizing a single
platform. The VGP may be easily recongured in the
eld to provide compatibility with almost any pneumat-
ic control valve on the market. The highly accurate per-
formance and ZERO emissions capabilities of the VGP
provide the desired features to meet natural gas indus-
try needs. The VGP was designed by the inventor of
the original “Valve Gas Positioner” and features patent
US 9,400,060B2 technological advances that provide
reliability, convenience, and performance above and
beyond previous technologies. VGP- Valve Gas Po-
sitioners represent the future of control valve control
technology and are backed up by the industries’ most
experienced team.
TECHNICAL ASSISTANCE
For technical assistance with VRG products, please
contact your local VRG Controls sales representative
or VRG Control direct. In order to facilitate technical
assistance, we strongly recommend that you obtain
the MODEL NUMBER and SERIAL NUMBER of the
product for which you require assistance prior to con-
tacting us. The MODEL NUMBER and SERIAL NUM-
BER may be found on the PRODUCT ID LABEL locat-
ed on the front of the VGP product on the center face
of lower portion of the power assembly.
APPLICABLE MODELS:
This instruction Manual applies to the following VRG
- Valve Gas Positioners. To conrm suitability for addi-
tional models and/or components, please contact VRG
Controls or view us online at www.vrgcontrols.com.
• VGP-100-DA-SN
• VGP-100-DA-SN-SPL
NOTES ON TABLE 1.0:
• Zero Steady State emissions achieved when VGP
properly adjusted to exhibit factory advised dead-
band setting.
• Consumption is approximate and based upon 100
psig Supply Gas. Atmosphere emissions may be
completely eliminated with Discharge to Pressure
System incorporated.
• Double acting VGP’s require addition of No-Vent
Device to achieve ZERO emissions at full open
and full closed.

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 4 of 33 DECEMBER 2020
VRG Controls LLC. 4 of 31 JULY 2017
VGP MODEL
Type
Outputs
Internal Valve Logic
Command Signal Range
Posioning Logic
Temperature Range
Linearity and Hysterisis
CONSUMPTION
Steady State Control
Full Open/Closed
ZERO Emissions
EPA Specicaons
PNEUMATIC
Command Signal
Supply Gas Quality
Max Supply Gas Pressure
Min Supply Gas Pressure
Max Discharge DeltaP
Min Discharge DeltaP
Connecons
CONSTRUCTION
External Parts
Internal Parts
Diaphragms
O-Rings
Control Springs
Gauges
Weight
Approximate Dimensions
TABLE 1.0
TECHNICAL
SPECIFICATIONS
VGP-100-SA-BV VGP-100-DA-BV VGP-100-DA-SN
ZERO^2 <10 SCFH^3 See formula D.
Single Acng Double Acng
NC Balanced Value No Seat + Nozzel^1
3-15 psig 6-30 psig, Split Range
Available (Close on Increasing) OR (Open on Increasing) Command Signal
-20*F to +160*F(-29*C to +71*C)
Proporonal Posioning Device
ZERO ZERO^4
0 Atmospheric Emissions May Be Achieved When “Vent to Pressure System” Feature Ulized
Exceeds EPA Ruling, EPA-HQ-OAR-2010-0505, requiring <6 SCFH bleed rate by Oct. 2013
Max Pressure 100 psig
Dry, Filtered @ 10u Natural Gas or Air
400 psig (2758 kPa)
20 psig
150 psig (1034 kPa)
20 psig (138 kPa)
All Ports 1/4 FNPT
VRG Military grade Alloy w/[Stealth System] Corroston Protecon (304SS Oponal)
316 SS
Nylon Reinforced Buna-N (Viton-Oponal)
Buna-N (Viton-Oponal)
Painted Alloy Steel
2.5 In. Liquid-Filled SS Case & Body
20 lbs. (9.0 kg)
22In x 12 In x 7 In (559 mm x 305 mm x 178 mm)
< 1%

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 5 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 5 of 32 JANUARY 2019
Item Tag Model Number Serial Number
1
2
3
4
5
6
7
8
Example Run 1 Monitor
Regulator
VGP-100-DA-BV 0912123V
TABLE 3.0 INSTALLED PRODUCT IDENTIFICATION LOG
We recommend that you record the MODEL NUMBER and SERIAL NUMBER of all VRG Products installed at each
applicaon locaon in the table below for future reference.
PRODUCT ID LABEL
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
S/N 0317005 DP
RCV100 1
SCAN QR CODE
T O R EGI ST ER
INV 17-1106
Base Model Acon Output Type Integral Valve Logic
VGP-100-DA-SN Double Acng 3-15 PSI
6-30 PSI
SN Sit and Nozzle
VGP-100-DA-SN-SPL Double Acng Split Control
See Table 5.0
N Sit and Nozzle
TABLE 2.0 MODEL NUMBER EXPLANATION
We recommend that you record the MODEL NUMBER and SERIAL NUMBER of all VRG Products installed at each
applicaon locaon in the table below for future reference.
Example: Model VGP-100-DA-SN
VPG MODEL NUMBER IDENTIFICATION LABEL

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 6 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 6 of 32 JANUARY 2019
FLOW CALCULATIONS
Variable Descripon Unit
  
1 
  
G 
T 
TABLE 4.0 
1 1


TABLE 5.0 

Installed Orice 0125 
Standard  0.009 0.018    0.111 
Medium (M)    0.089   0.211 
Large (L)        
Adjustable Orice Seng
Notes:
1. 

2. 

 


Notes:
1. Equation above may be utilized to determine supply regulator consumption requirements
and steady state bleed reates for control valves operated with a VGP Valve Gas Positioner.
2. VGP Adjustable Orices are typically utilized in double acting applications only and rep-
resents the limiting ow rates and resultant stroking times.
3. When application do not utilize Adjustable Orice, then the VGP internal Balanced Valve
becomes the limiting factor to determine ow rates and resultant stroking times. VGP In-
ternal Balanced Valve Cv=1.45.

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 7 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 7 of 32 JANUARY 2019
SIGNAL
RANGE
3-15 psig
6-30 psig
3-9 psig
9-15 psig
6-24 psig
18-30 psig
Variable Descripon Unit
tStroke Time Sec.
H Actuator Cylinder Stroke Length in.
D Actuator Cylinder Diameter in.
Cv Liming Flow Coecient --
GGas Specic Gravity Typ. 0.6 Natural Gas
TGas Temperature *F
TABLE 6.0 ESTIMATED TRAVEL TIME
Where:
t=0.148 X G
T + 460
H X D
Cv
2
X
TABLE 7.0 VGP VALVE GAS POSITIONERS BIAS AND SPRING RANGE CONFIGURATIONS
RANGE ES-0015 ES-0025 ES-0035 ES-0045
BIAS
RANGE ES-0018 ES-0028 ES-0038 ES-0048
BIAS
RANGE ES-0010 ES-0020 ES-0030 ES-0040
BIAS
RANGE ES-0010 ES-0020 ES-0030 ES-0040
BIAS
RANGE ES-0016 ES-0026 ES-0036 ES-0046
BIAS
RANGE ES-0015 ES-0025 ES-0035 ES-0045
BIAS
N/A
N/A
CS-0100 (BLACK)
CS-0110 (BROWN)
CS-0100 (BLACK)
CS-0110 (BROWN)
2-4 in 4-6 in 6-8 in 10-12 in
ACTUATOR STROKE LENGTHSPRING
CS-0100 (BLACK) .50 psi/turn
CS-0110 (BROWN) 1.86 psi/turn
CS-0100 (BLACK) .50 psi/turn
CS-0100 (BLACK) .50 psi/turn
CS-0110 (BROWN) 1.86 psi/turn

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 8 of 33 DECEMBER 2020
Application
Ball Valve
All Globe Valve
Moderate Volume DA
< 950in
3
) Actuator
Large Volume DA Actuator
See Note. 5.0 Volume Booster
Discharge of Pressure System
OPEN Orifice10
CLOSE Orifice6
N Y S4 S4
Y N S3 S3
Y N S2 S2
N Y S4 S4
NOTE: Volume Booster is adjusted with booster by-pass valve open 1/4 turn.
Pipeline Interconnect4
Recommended
VGP Model
VGP-DA-SN
(Actuator Volume < 950in3)
VGP-DA-SN
(Actuator Volume < 950in3)
VGP-DA-SN
(Actuator Volume < 950in3)
VGP-DA-SN
(Actuator Volume < 500in3)
70 TARGET Balance Pressure
VGP Model
0.7 (PSupply - PDischarge)) + PDischarge
0.7 X Psupply
0.6 X Psupply
0.7 (PSupply - PDischarge)) + PDischarge
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 8 of 32 JANUARY 2019
TABLE 8.0 APPICATION BASED FINE TUNING SETTING GUIDELINES - VGP DOUBLE ACTING
Receommended
VGP Model
VGP-DA-SN
(Actuator Volume < 950in )
VGP-DA-SN
(Actuator Volume < 950in )
VGP-DA-SN
(Actuator Volume > 950in )
VGP-DA-SN
(Actuator Volume < 500in )
3
3
3
3
ALU
< 950in )
3
5.0
70
0.8
0.8
Note: Volume booster is adjusted with the booster by-pass valve open 1/4 turn.
See note.
0.8
0.8
TABLE 11.0 APPLICATION BASED FINE TUNING SETTING GUIDELINES – VPC DOUBLE ACTING
(-1/4)
(-1/4)
(-1/4)
NOTES
1. For ACTUATOR VOLUME greater than 950 in3












NOTES
















VOLUME BOOSTER
IN
OUT
BOOSTER
SENSITIVITY
ADJUSTMENT

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 9 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 9 of 32 JANUARY 2019

The posioner is a force-balanced instrument that
provides a control valve posion proporonal to
the pneumac input signal. The control valve will
open on loss of input signal. The energy to operate
the control valve is obtained from the dierenal
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 top and boom
nozzles in the posioner are at equal distance from
seats. The cylinder top and boom pressures are
both equal to power gas pressure, and the control
valve is staonary. An increase in the input signal
pressure results in the closing of the lower seat due
to an imbalance in the beam forces. This increases
the pressure in the cylinder boom and decreases
the pressure in the cylinder top. 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, connues to increase
unl the balance beam forces are in equilibrium. At
this point the valve is in the correct posion for the
applied input signal. The posioner has a sensivity
adjustment which permits a balance between
greater accuracy and an amount of bleed gas.
O
The posioner is a force-balanced instrument that
provides a control valve posion proporonal to the
pneumac input signal. The control valve will close on
loss of input signal. The energy to operate the control
valve is obtained from the dierenal 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 cylinder top and boom pressures
are both equal to power gas, and the control valve is
staonary. An increase in the input signal pressure
results in the valve due to an imbalance in the beam
forces. This decreases the pressure in the cylinder
while the pressure in the cylinder top remains at
power gas pressure. The control valve begins to open.
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,
connues to increase unl the balance beam forces are
in equilibrium. At this point the valve is in the correct
posion for the applied input signal. The posioner
has a sensivity adjustment which permits a balance
between greater accuracy and minimal bleed gas.


P2 P1
OPEN
OPEN
FLOW
CLOSE
P1
SIGNAL

C O

OPEN
CLOSE
P2 P1
FLOW
SIGNAL



OPEN
Open on Increasing Signal - Actuator Fails Closed
The positioner is a force-balanced instrument that
provides a control valve position proportional to the
pneumatic input signal. The control valve will close on
loss of input signal. The energy to operate the con-
trol valve is obtained from the di󰀨erential between the
supply and discharge pressures. In steady state, the
forces imposed on the balance beam by the input sig-
nal diaphragm and the range spring are equal; there-
fore, the cylinder top and bottom pressures are both
equal to power gas, and the control valve is station-
ary. An increase in the input signal pressure results
in the valve due to an imbalance in the beam forces.
This decreases the pressure in the cylinder while the
pressures in the cylinder top remains at power gas
pressure. The control valve begins to open. The ac-
tuator 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 cor-
rect position for the applid input signal. The positioner
has a sensitivity adjustment which permits a balance
between greater accuracy and minimal bleed gas.
Close on Increasing Signal
The positioner is a force-balanced instrument that
provides a control valve position proportional to the
pneumatic input signal. The control valve will open on
loss of input signal. The energy to operate the con-
trol valve is optained from the di󰀨erential between
the supply and discharge pressures. In stead state,
the forces imposed on the balance beam by the in-
put signal diaphragm and the range spring are equal;
therefore, the top and bottom nozzles in the positioner
are at equal distance from seats. The cylinder top and
bottom pressures are both equal to power gas pres-
sure, and the control valve is stationary. An increase
in the input signal pressure results in the closing of the
lower seat due to an imbalance in the beam forces.
This increases the pressure in the cylinder bottom and
decreases the pressure in the cylinder top. 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 un-
til the balance beam forces are in equilibrium. At this
point the valve is in the correct position for the applied
input signal. The positioner has a sensitivity adjust-
ment which permits a balance between greater accu-
racy and an amount of bleed gas.

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 10 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 10 of 32 JANUARY 2019
VGP-100-DA-SN (CI) Assembly Guide
Part Number: PA-0170
VGP-100-DA-DA SN (CI) Assembly Guide
Part Number: PA-0171
EX
EX
Note: Acon open/close on increasing depends on direcon of the feedback mechanism.
The table refers to “down to open” mechanisms. If mechanism is “down to close” the acon
will reverse.
Note: Action open/close on increasing depends on direction of the feedback mechanism. The table
refers to “down to open” mechanisms. If mechanisms is “down to close” the action will reverse.

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 11 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 11 of 32 JANUARY 2019
VGP-100-DA-BV (OI)
Part Number: PA-0175
VGP-100-DA-SPL (OI) Assembly Guide
Part Number: PA-0176
EX
EX
EX
Note: Acon open/close on increasing depends on direcon of the feedback mechanism.
The table refers to “down to open” mechanisms. If mechanism is “down to close” the acon
will reverse.
Note: Action open/close on increasing depends on direction of the feedback mechanism. The table
refers to “down to open” mechanisms. If mechanisms is “down to close” the action will reverse.

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 12 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 12 of 32 JANUARY 2019
   
PD-5065 ALL VGP TR-CI Beam Curved Extension (I) 1
FB-0035 4, 6, 8 8” Stoke Range Spring TR Extension (L) 1
FB-0037 12 12” Stroke Range Spring TR Extension
(L)
1
FN-0255 ALL 7/16-20 Hex Jam Nut SS (J) 2

In some situaons the VGP-DA-SN posioner
may need to be congured from an open
on increasing signal posioner, to a close on
increasing signal posioner, or vice versa.


Order parts per table 9.0.
TABLE 9.0 Bill of Materials for Conversion Kit to CI from OI
Figure 1. Close on Increasing VGP-SA-BV Front View
 Remove the (2) 
from the  Remove the TOP
BOX from the 
 Remove the
 that fasten the to the VGP

Figure 2. Top Box Removal
A
B
C
D
E

 Disconnect all supply lines, instrument lines
and output line from the posioner.
In some situations the VGP-DA-SN positioner
may need to be congured from an open on
increasing signal positioner, to a close on in-
creasing signal positioner, or vice versa.
To Change from Open on Increasing to Close
on Increasing
Order parts per table 9.0.
Disconnect all supply lines, instrument
lines and output line from the positioner.
Step 1: Remove the (2) 1/4-20 x 1-1/4” SHCS 316 SS
(A) from the TOP BOX COVER (B). Remove
the TOP BOX COVER (B) from the TOP BOX
(C).
Remove the 1/4-20 x 1-3/4” SHCS 316 SS
BOLT (D) that fasten the TOP BOX (C) to the
VGP BOTTOM BOX (E).
Step 2:
Step 3:

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 13 of 33 DECEMBER 2020
VGP-SN Valve Gas Posioner
Instrucon Manual
VRG Controls LLC. 13 of 32 JANUARY 2019
Part No. Stroke Descripon Qt.
PD-5065 ALL VGP TR-CI Beam Curved Extension (I) 1
FB-0035 4, 6, 8 8” Stoke Range Spring TR Extension (L) 1
FB-0037 12 12” Stroke Range Spring TR Extension
(L)
1
FN-0255 ALL 7/16-20 Hex Jam Nut SS (J) 2
Figure 3. Unlocking Range Spring
Step 4: Unlock and remove the RANGE EXTENSION SPRING
(F) from the RANGE SPRING RETAINER (G).
Step 5: Remove the VGP RANGE SPRING SCREW 1-5/8”
LONG (H) and RANGE EXTENSION SPRING (F)
from the VGP-TR-CI BEAM CURVED EXTENSION
(I).
Step 6: Remove the (2) 7/16-20 JAM NUTS RH 316 SS
(J) and SPRING RETAINER (G) from the BIAS
ADJUSTMENTING STUD (K).
Figure 4. Range spring and Retainer Removal
Step 7: Unscrew and remove the VGP ADJUSTING STUD
(K) from the VGP STROKE RANGE SPRING TR
EXTENSION (L).
Step 8: Unscrew and remove the VGP STROKE RANGE
SPRING TR EXTENSION (L) from the Actuator Rod,
along with the VGP TR INDICATOR WASHER (N)
and VGP TR SPACER (O).
Figure 5. Removing the Extension from the Rod
Step 9: Unscrew and remove (4), 5/16-18x 1 HHCS 316
SS (P) from the VGP SUPPORT BRACKET (Q).
Figure 6. Preparing to Remove the Posioner
F
G
K
L
M
N
P
Q
P
O
H
J
G
I
J
F
K
J
Unlock and remove the RANGE EXTENSION
SPRING (F) from the RANGE SPRING RE-
TAINER (G).
Step 4: Unscrew and remove the VGP ADJUSTING
STUD (K) from the VGP STROKE RANGE
SPRING TR EXTENSION (L).
Unscrew and remove the VGP STROKE
RANGE SPRING TR EXTENSION (L) from the
Actuator Rod, along with the VGP TR INDICA-
TOR WASHER (N) and VGP TR SPACER (O).
Step 7:
Step 8:
Remove the VGP RANGE SPRING SCREW
1-5/8” LONG (H) and RANGE EXTENSION
SPRING (F) from the VGP-TR-CI BEAM
CURVED EXTENSION (I).
Remove the (2) 7/16-20 JAM NUTS RH 316 SS
(J) and SPRING RETAINER (G) from the BIAS
ADJUSTMENTING STUD (K).
Step 5:
Step 6:
Unscrew and remove (4), 5/16-18x 1 HHCS 316
SS (P) from the VGP SUPPORT BRACKET (Q).
Step 9:

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Figure 7. Remove Posioner and VGP Beam Cover
Step 10: Pull the VGP-DA-SN from the VGP TR BOTTOM
BOX (E).
Step 11: Unscrew and remove (2) 1/4”-20 x 1/2” SHCS SS
(S). Separate the VGP BEAM COVER (R) from the
VGP TR BOTTOM BOX (E).
Step 12: Assemble parts VGP TR SPACER (Q) , VGP-TR-
INDICATOR WASHER (N), VGP-TR-OI OFFSET BAR
(M), SPRING HOLDER EXTENSION (U) on Cylinder
Tailroad or Actuator Rod. Tighten the Parts with
7/16-20 X 1-3/4” HHCS 18-8 SS (T). Insert VGP
ADJUSTING STUD (K) into SPRING HOLDER
EXTENSION STUD (K). Tighten 7/16-20 JAM NUT
RH 316 SS (J).
Figure 8. Re-insert the VGP Bias Adjusng Stud Upside Down
E
R
S
Figure 9. Re-connecng the Range Extension Spring.
Step 13: Insert the VGP-RANGE SPRING SCREW (H) into
the RANGE EXTENSION SPRING (F), and thread it
into the BIAS ADJUSTING STUD (K).
Figure 10. Re-aaching the Top Box.
Step 14: Install VGP TOP BOX (C) onto the VGP BOTTOM
BOX (E). Fasten the assembly together using (2)
1/4-20 x 1-3/4” SHCS 316 SS (D).
C
D
E
F
K
F
H
K
T
H
K
M
N
J
Q
K
Pull the VGP-DA-SN from the VGP TR BOT-
TOM BOX (E).
Unscrew and remove (2) 1/4”-20 x 1/2” SCHS
SS (S). Separate the VGP BEAM COVER (R)
from the VGP TR BOTTOM BOX (E).
Step 10:
Step 11:
Assemble parts VGP TR SPACER (Q), VGP-TR-IN-
DICATOR WASHER (N), VGP-TR-OI OFFSET BAR
(M), SPRING HOLDER EXTENSION (U) on Cylinder
Tailrod or Actuator Rod. Tighten the Parts with 7/16-
20 x 1-3/4” HHCS 18-8 SS (T). Insert VGP ADJUST-
ING STUD (K) into SPRING HOLDER EXTENSION
STUD (K). Tighten 7/16-20 JAM NUT RH 316 SS (J).
Step 12:
Install VGP TOP BOX (C) onto the VGP BOTTOM
BOX (E). Fasten the assembly together using (2)
1/4-20 x 1-3/4” SHCS 316 SS (D).
Step 14:

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Figure 11. Moving the VGP Box Side Cover to the VGP
Boom Box
 Insert the  into the VGP
on the 

 Install  using 

Figure 12. Removing the Access Cover from the Top Box
E
V
W
Figure 13. Fastening the Spring Retainer
Figure 14. Aaching the VGP
 Insert the POSITIONER into the 
onto the Fasten the
assembly using (4)
C
R
P

RS
X
G
AA
Y
Z
Convert VGP-SA-BV-CI to VGP-SA-BV-OI. Use diagram
and drawing on page 12. Fasten the SPRING RETAINER
to the using 
 Install and 
using .
Install VGP BEAM COVER (R) using 1/4-20 x
1/2” SHCS (S).
Step 16:
Step 17:Convert VGP-SA-BV-CI to VGP-SA-BV-OI. Use dia-
gram and drawing on page 12. Fasten the SPRING
RETAINER (G) to the PIVOTED BEAM (AA) us-
ing (2) 8-32 x 1/2” SHCS (X). Install VGP RANGE
SPRING LOCK (Y) and 1/4” ID LOCK WASHER (Z)
using 8-32 x 1/2” SHCS (X)
Insert the 1/4-20 Hex Nut 316 SS (V) into the
VGP BOX SIDE COVER (W) on the VGP BOT-
TOM BOX (E).
Step 15:
Insert the POSITIONER into the VGP BEAM
COVER (R) onto the TOP BOX (C). Fasten the
assembly using (4) 5/16-18x 1HHCS 316 SS (P).
Step 18:

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Instrucon Manual
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Figure 15. Connecng the Range Spring and Locking it onto
the Spring Retainer
Step 19: Pull the RANGE SPRING (F) up over the RANGE
SPRING RETAINER (G) and wind approximately 3
coils before locking.
G
F
Figure 16. Finalizing the Topworks Assembly
Step 20: Adjust posioner per procedures on PG. 20-23.
Put BOX TOP COVER (B) on TOP BOX (C) using (2)
1/4-20 x 1-1/4” SCHS 316 SS (A).
Step 21: Install ngs, gages and tubing using the piping
schemac drawings on Pg. 28-35
A
B
C
Figure 17. Posioner Fings and Tubing in the Final
Posion
Pull the RANGE SPRING (F) up over the RANGE
SPRING RETAINER (G) and wind approximately
3 coils before locking.
Step 19: Adjust positioner per procedures on PG. 20-23.
Put BOX TOP COVER (B) on TOP BOX (C) using
(2) 1/4-20 x 1-1/4” SCHS 316 SS (A).
Step 20:
Install ttings, gages and tubing using the piping
schematic drawings on Pg. 28-35.
Step 21:

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CLOSE ON INCREASING ADJUSTMENT PROCEDURE
The VGP-DA-SN posioner comes factory adjusted for
your parcular applicaon. The use of the following
adjustment procedure will only be necessary when
a RUBBER GOODS replacement kit is installed or
any other me the posioner is disassembled.
The VGP-DA-SN posioner has 3 adjustment secons:
1. The ADJUSTMENT DRUM adjusts the sensitvity.
2. The ADJUSTMENT SCREW adjusts the bias
3. The RANGE SPRING adjusts the span.
Adjustment Drum Sengs
The ADJUSTMENT DRUM seng ne tunes the
sensivity of the VGP internal valves.
Figure 18. VGP-SA-BV Adjustment Drum
Figure 19. Range Spring and Spring Retainer Adjustment
Figure 20. Set Instrument Signal to Midpoint
BB
G
F
Step 1: Turn the dead band ADJUSTMENT DRUM (BB) in
the direcon of decreasing numbers unl it can
no longer turn, then turn the drum one turn in
the opposite direcon (use the numbers on the
drum as a guide).
Step 2: If not already aached, wind 3 to 4 coils of the
RANGE SPRING (F) onto the RANGE SPRING
RETAINER (G).
Step 3: If not already adjusted, set the RANGE SPRING
RETAINER (G) so that it is in the middle of the
stud.
Step 4: Set the instrument signal pressure at the
midpoint of its range. For example, set it at 9
psig if the range is 3-15 psig, or 18 psig if the
range is 6-30 psig. Stroke the actuator to an
intermediate posion.
The VGP-DA-SN positioner comes factory adjusted for
your particular application. The use of the following adjust-
ment procedure will only be necessary when a RUBBER
GOODS replacement kit is installed or any other time the
positioner is disassembled.
The VGP-DA-SN positioner has 3 adjustment sections:
1. The ADJUSTMENT DRUM adjusts the sensitivity.
2. The ADJUSTMENT SCREW adjusts the bias
3. The RANGE SPRING adjusts the span.
Adjustment Drum Settings
The ADJUSTMENT DRUM setting ne tunes the sensitivity
of the VGP internal valves.
Turn the dead band ADJUSTMENT DRUM (BB)
in the direction of decreasing numbers until it can
no longer turn, then turn the drum one turn in the
opposite direction (use the numbers on the drum
as a guide).
If not already attached, wind 3 to 4 coils of the
RANGE SPRING RETAINER (G).
If not already adjusted, set the RANGE SPRING
RETAINER (G) so that it is in the middle of the
stud.
Step 1:
Step 2:
Step 3:
Set the instrument signal pressure at the mid-
point of its range. For example, set it at 9 psig if
the range is 3-15 psig, or 18 psig if the range is
6-30 psig. Stroke the actuator to an intermediate
position.
Step 4:

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Step 5A:If the actuator is equipped with a VMO-150
Manual Control Valve, place the le VMO handle
in the manual posion.
Note: When increasing or decreasing the
instrument signal, the output pressure should
swing up and down respecvely. When changing
direcon of the false instrument signal, the output
pressure should immediately reverse direcon.
Any “bump” or inial reacon of the gauge in
the wrong direcon indicates fricon within the
components of the posioner. In the case where
fricon is a problem the posioner must be
disassembled and rebuilt to eliminate it.
Figure 21. Le handle moved to manual posion.
Step 5B: If the actuator is not equipped with VMO-150,
use the 1/4” ball block valve installed between
the posioner output and the actuator. Once the
actuator has reached its desired posion (based
on the mid-signal applied to the instrument port
in step d), place the block valve in the closed
posion.
a) Observe the output pressures. Set output
pressure per table 8.0 using the i.0. Turning
the drum in the direcon of increasing
numbers will reduce the output pressure.
Note: Raising the output pressure will reduce
sensivity and bleed gas at steady state.
b) At this point the unit is properly adjusted if
an increase or decrease in the input signal of
0.25 psig causes the output gauge to swing in
either direcon.
If the actuator is equipped with a VMO-150 Manu-
al Control Valve, place the left VMO handle in the
manual position.
Step 5A:
If the actuator is not equipped with VMO-150, use
the 1/4” ball block valve installed between the po-
sitioner output and the actuator. Once the actua-
tor has reached its desired position (based on the
mid-signal applied to the instrument port in step
d), place the block valve in the closed position.
a) Observe the output pressure. Set output
pressure per table 8.0 using the i.O. Turning
the drum in the direction of increasing num-
bers will reduce the output pressure.
Note: Raising the output pressure will re-
duce sensitivity and bleed gas at steady
state.
b) At this point the unit is properly adjusted
if an increase or decrease in the input sig-
nal of 0.25 psig causes the output gauge to
swing in either direction.
Step 5B:

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
The bias, or oset, determines the input signal at which
the posioner begins to stroke the valve. Give the
posioner an input signal equal to the low value of the
input range (usually 3 or 6 psig). The 
must be loosened before adjustment


There will be some interacon between range
and bias adjustments. It may therefore be necessary
to readjust the bias and re-check the range aer
compleng the following steps. The range, or the
amount of travel between 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 dened as the inial point at which the instrument
signal to the VGP-DA-SN creates creates full dierenal
pressure across cylinder top and boom gauges. (equal
to the power gas pressure) or zero (depending on the
posioner and actuator acon) output pressure.
F
K

G

 To increase the bias seng, increase tension on
the  . This is accomplished
by either raising the RANGE SPRING RETAINER
 or screwing the 
 into the indicator bar or tail rod. When
properly adjusted, ghten the

 In order to decrease the bias seng, decrease
tension on the by either
lowering the RANGE  or
screwing the 
out of the indicator bar or tail rod. When properly
adjusted, ghten the 
. For Split Range Systems refer to Table 6.0
on PG. 7
 Aer seng the bias for the start of the valve
travel, connue increasing the instrument
signal unl full stroke of the valve is achieved.
 The upper end of the range will be found
when the valve travel indicator reaches the
end of stroke and the cylinder top and boom
pressures are equal. Connue chnaging the
signal an addiona 1/2 psi unl one gauge
reads the power gas and the second gauge
reads zero pressure. The bleed gas will stop at
this me.

If the range is less than desired (i.e. the
actuator reaches its full travel in less than the
specied 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 clockwise. Repeat adjustments unl the
desired range provides full or zero output

If the desired range is not achieved aer
making the above adjustments, readjust the
bias (per the previous instrucons) to allow
proper range adjustment.

It may be necessary to change the range
spring screw for some non-standard ranges
 The bias adjustment for Split Range Posioner
a. Lock the G in the middle of its available
posioner.
b. Use bias adjustment screw instead of the
G to adjust bias tension.
PD-5098 VGP RANGE SCREW 7/8 LNG
PD-5100 VGP RANGE SCREW 1-5/8 LNG
PD-5101 VGP RANGE SCREW 2-1/4 LNG
TABLE 10.0 RANGE SPRING SCREW
The bias, or o󰀨set, determines the input signal at which
the positioner begins to stroke the valve. Give the posi-
tioner an input signal equal to the low value of the input
range (usually 3 or 6 psig). The 7/16-20 JAM NUTS RH
3/6 SS (J) must be loosened before adjustment.
To increase the bias setting, increase tension
on the RANGE SPRING (F). This is accom-
plished by either raising the RANGE SPRING
RETAINER (G) or screwing the BIAS ADJUST-
MENTING STUD (K) into the indicator bar or
tail rod. When properly adjusted, tighten the
7/16-20 JAM NUTS RH 3/6 SS (J).
In order to decrease the bias setting, decrease
tension on the RANGE SPRING (F) by either
lowering the RANGE SPRING RETAINER
(G) or screwing the BIAS ADJUSTMENTING
STUD (K) out of the indicator bar or tail rod.
When properly adjusted, tighten the 7/16-20
JAM NUTS RH 3/6 SS (J). For Split Range
Systems refer to Table 6.0 on PG. 7
The bias adjustment for Split Range Positioner
a. Lock the G in the middle of its
available positioner.
b. Use bias adjustment screw instead of
the G to adjust bias tension.
Step 1:
Step 2:
Step 3:
After setting the bias for the start of the valve
travel, continue increasing the instrument signal
until full stroke of the valve is achieved.
The upper end of the range will be found when
the valve travel indicator reaches the end of
stroke and the cylinder top and bottom pressures
are equal. Continue changing the signal an ad-
ditional 1/2 psi until one gauge reads the power
gas and the second gauge reads zero pressure.
The bleed gas will stop at this time.
If the range is less than desired (i.e. the actuator
reaches its full travel in less than the specied in-
put range), strengthen the range spring by wind-
ing it counterclockwise onto the spring retainer.
If the range is greater than desired, weaken the
range spring by winding it clockwise. Repeat ad-
justments until the desired range provides full or
zero output.
If the desired range is not achieved after making
the above adjustments, re-adjust the bias (per
the previous instructions) to allow proper range
adjustment.
It may be necessary to change the range spring
screw for some non-standard ranges.
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:

VGP-SN Valve Gas Posioner
Instrucon Manual
VRG CONTROLS LLC. 20 of 33 DECEMBER 2020
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TABLE 11.0 Piping Diagram Guide
Note: Addion of split range will not change the diagrams conguraon.
Diagram No. VGP Part Number Actuator Actuator Mode Accessory Discharge
1 VGP-100-DA-SN (OI) PA-0175 Piston Double Acng NVD ATM
1A VGP-100-DA-SN (OI) PA-0175 Piston Double Acng NVD, VMO ATM
1B VGP-100-DA-SN (OI) PA-0175 Piston Double Acng NVD,
BOOSTER
ATM
1C VGP-100-DA-SN (OI) PA-0175 Piston Double Acng NVD, VMO,
BOOSTER
ATM
2VGP-100-DA-SN (CI) PA-0170 Piston Double Acng NVD ATM
2A VGP-100-DA-SN (CI) PA-0170 Piston Double Acng NVD, VMO ATM
2B VGP-100-DA-SN (CI) PA-0170 Piston Double Acng NVD, VB ATM
2C VGP-100-DA-SN (CI) PA-0170 Piston Double Acng NVD, VMP.
VB
ATM
Acon open/close on increasing depends on direcon of the feedback mechanism. The table
refers to “down to open” mechanisms. If mechanism is “down to close” the acon will re-
verse.
All shown diagrams have feedback mechanism “down to open”.