Baker Becker VRP-CH Series User manual
VRP-CH Series
Valve Regulator Pilots
Instruction Manual (Rev.A)
2 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
THESE INSTRUCTIONS PROVIDE THE CUSTOMER/OPERATOR WITH IMPORTANT PROJECT-
SPECIFIC REFERENCE INFORMATION IN ADDITION TO THE CUSTOMER/OPERATOR’S
NORMAL OPERATION AND MAINTENANCE PROCEDURES. SINCE OPERATION AND
MAINTENANCE PHILOSOPHIES VARY, BAKER HUGHES (AND ITS SUBSIDIARIES AND
AFFILIATES) DOES NOT ATTEMPT TO DICTATE SPECIFIC PROCEDURES, BUT TO PROVIDE
BASIC LIMITATIONS AND REQUIREMENTS CREATED BY THE TYPE OF EQUIPMENT
PROVIDED.
THESE INSTRUCTIONS ASSUME THAT OPERATORS ALREADY HAVE A GENERAL
UNDERSTANDING OF THE REQUIREMENTS FOR SAFE OPERATION OF MECHANICAL AND
ELECTRICAL EQUIPMENT IN POTENTIALLY HAZARDOUS ENVIRONMENTS. THEREFORE,
THESE INSTRUCTIONS SHOULD BE INTERPRETED AND APPLIED IN CONJUNCTION WITH
THE SAFETY RULES AND REGULATIONS APPLICABLE AT THE SITE AND THE PARTICULAR
REQUIREMENTS FOR OPERATION OF OTHER EQUIPMENT AT THE SITE.
THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONS IN
EQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE MET IN
CONNECTION WITH INSTALLATION, OPERATION OR MAINTENANCE. SHOULD FURTHER
INFORMATION BE DESIRED OR SHOULD PARTICULAR PROBLEMS ARISE WHICH ARE NOT
COVERED SUFFICIENTLY FOR THE CUSTOMER/OPERATOR'S PURPOSES THE MATTER
SHOULD BE REFERRED TO BAKER HUGHES.
THE RIGHTS, OBLIGATIONS AND LIABILITIES OF BAKER HUGHES AND THE CUSTOMER/
OPERATOR ARE STRICTLY LIMITED TO THOSE EXPRESSLY PROVIDED IN THE CONTRACT
RELATING TO THE SUPPLY OF THE EQUIPMENT. NO ADDITIONAL REPRESENTATIONS OR
WARRANTIES BY BAKER HUGHES REGARDING THE EQUIPMENT OR ITS USE ARE GIVEN
OR IMPLIED BY THE ISSUE OF THESE INSTRUCTIONS.
THESE INSTRUCTIONS ARE FURNISHED TO THE CUSTOMER/OPERATOR SOLELY TO
ASSIST IN THE INSTALLATION, TESTING, OPERATION, AND/OR MAINTENANCE OF THE
EQUIPMENT DESCRIBED. THIS DOCUMENT SHALL NOT BE REPRODUCED IN WHOLE OR IN
PART WITHOUT THE WRITTEN APPROVAL OF BAKER HUGHES.
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 3Copyright 2023 Baker Hughes Company. All rights reserved.
Table of Contents
Page
Introduction ..........................................................................................................................3
Description...................................................................................................................3
Technical Assistance...................................................................................................3
Scope of Manual..........................................................................................................4
..........................4
Applications .................................................................................................................4
Guidelines for Usage ...................................................................................................4
Technical Information..........................................................................................................5
Technical Specifications...............................................................................................5
Materials of Construction.............................................................................................5
.........................................................................................5
VRP-CH Pilot Selection Chart .....................................................................................6
Principles of Operation .......................................................................................................7
Adjustment Procedure ........................................................................................................7
Initial Adjustment .........................................................................................................7
Fine Tuning Procedures ..............................................................................................9
Inspection Procedure.................................................................................................10
Internal Friction Test ..................................................................................................10
Annual Maintenance Checklist ..................................................................................11
Parts Ordering....................................................................................................................11
Seal Kit ......................................................................................................................11
VRP-CH Pilot Blank Parts .........................................................................................12
......................................................................13
...................................................................14
Appendix
Flow Calculations.......................................................................................................16
Critial Flow.................................................................................................................16
Steady State Consumption........................................................................................16
Supply Regulator Capacity ........................................................................................16
Travel Time ................................................................................................................16
............................................................................................16
Accessories........................................................................................................................16
Assembly Procedures .......................................................................................................18
...................................................................................18
...................................................................................21
........................................................................23
............................................................................................25
...........................................................................26
...........................................................................................27
Spring Concentricity Test ..........................................................................................27
..............................................................................27
.......................................................................................28
...................................................................................29
List of Recommended Tools......................................................................................29
Part Silhouettes .........................................................................................................30
Introduction
The Becker™
units offer highly accurate control characteristics over a wide
ultimately saves a significant amount of money for the operating
company and reduces the environmental impact of atmospheric
Description
valve. The VRP-CH measures downstream sensing pressure
pressure control applications with setpoints ranging from 1 psig
to 1500 psig. The Becker CH pilot design represents Baker
Hughes commitment to continually develop new products
retaining simple operation and low maintenance.
4 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Scope of Manual
specific product.
Note:
Advantages of the Combination Chamber VRP
Pilot controllers
to the outside weather conditions and condensation.
shift when changing setpoint.
3. Because the need for a flat diaphragm for some pilot models
4. The VRP pilots will have only 3 diaphragms (as opposed to
5).
diaphragms.
of friction from poorly aligned spring.
Applications
• Primary pressure control
• Overpressure protection (monitor)
• Relief valve
• Backpressure control
• Power plant type applications(1)
pressure limiting)
• Suction control to reciprocating compressors(1)
(1)
• High gain systems that require fast stroking speed (power
(1))
• Large volume control valve actuators
Guidelines for Usage
Large volume control valve actuators: Control valves that
require large volume actuators also may require VB-250 volume
3).
Bleed to pressure system: The VRP-CH pilot is typically is
used for applications with a discharge pressure of 350 psig or
discharge gas in the piping system.
High gain systems: Power plant feeds and other similar
CVE globe pattern control valves: The VRP-CH is the only
Compatible Actuators:
(1)
Retrot Compatibility:
genuine Becker control valve actuators. Should you already
a VRP-CH can improve performance and lower atmospheric
• Bettis T series piston actuators
• Rotork series XX actuators
• Fisher Type 470 piston actuators
• Fisher Type 1061 piston
(1)Consult Baker Hughes for additional information.
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 5Copyright 2023 Baker Hughes Company. All rights reserved.
Technical Specications
Steady State Gas
Consumption
Supply Gas
Maximum Flow Capacity 850 scfh (24 scmh)
Maximum Supply Pressure 400 psig (2758 kPa)
Maximum Supply-
Discharge
Dierential
250 psig (1724 kPa)
Minimum Supply-
Discharge
Dierential
50 psig (348 kPa)
Operative Ambient
Temperature Range
-20 to 160°F
-29 to 71°C
Approximate Weight 12 pounds (5.4 kg)
Minimum Deadband 0.2% instrument signal
Control Accuracy
Maximum Sensing
Pressure
1500 psig
Setpoint Range 3 psig - 1500 psig
Housing
Installation Orientation • Vertical position recommended.
actuators from Baker Hughes
to other manufacturers’ actuators
Materials of Construction
External Parts
Steel
(for marine environments)
Internal Parts
Aluminium
Springs Plated steel
Diaphragm Buna-N with nylon reinforcement
Seats and O-Rings Buna-N
Tubing and
Tubing Fitting
316 Stainless Steel
Gauges 21/2
stainless steel case(1)
(standard issue with dual units of psig/kPa
Model Number Explanation
cover sensing pressures from 3 psig to 1500 psig.
(1)Consult Baker Hughes for additional information.
VRP-175-CH VRP-600-CH VRP-1000-CH VRP-1500-CH
Technical Information
VRP-CH pilots - model numbers
6 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
(1)
Remote Setpoint Change Options
• The SM-1000 series motors accept a 24 VDC or 120 VAC input. The SM-1100 series motors accept a 4-20 MA signal and require
a separate 24 VDC or 120 VAC power connection.
the total setpoint range.
VRP-CH Pilot Selection Chart
Model Number Control Range
(psig/kPa)
Spring Color
(Part Number)
Setpoint Change per
Revolution of
Setpoint Screw
(psig/kPa)
Setpoint Range
Discrete Remote
Control (SM-1100)
Setpoint Range
Analog (4-20 mA)
Remote Control
(SM-1000)
VRP-175-CH(1)
3 - 10 psig
20 - 69 kPa
Gold
(25-8236)
0.57 psig
3.9 kPa
3.1 psig
21 kPa
9 psig
62.1 kPa
7 - 30 psig
48 - 207 kPa
Beige
(25-8238)
2.0 psig
13.7 kPa
11 psig
75.8 kPa
23 psig
159 kPa
15 - 50 psig
103 - 345 kPa
Burgundy
(25-8239)
3.0 psig
21 kPa
16.5 psig
114 kPa
35 psig
241 kPa
20 - 85 psig
138 - 596 kPa
Pink
(25-8240)
6.4 psig
44 kPa
35.2 psig
243 kPa
65 psig
448 kPa
50 - 175 psig
345 - 1207 kPa
Yellow
(25-1306)
23 psig
157 kPa
125 psig
862 kPa
125 psig
862 kPa
VRP-600-CH
5 - 40 psig
34 - 246 kPa
Gold
(25-8236)
2.1 psig
14.6 kPa
11.5 psig
79 kPa
35 psig
241 kPa
25 - 140 psig
172 - 965 kPa
Beige
(25-8238)
7.4 psig
51 kPa
41 psig
283 kPa
115 psig
793 kPa
50 - 175 psig
345 - 1207 kPa
Burgundy
(25-8239)
11.3 psig
78 kPa
62 psig
427 kPa
125 psig
862 kPa
135 - 300 psig
931 - 2069 kPa
Pink
(25-8240)
24 psig
164 kPa
132 psig
910 kPa
165 psig
1138 kPa
275 - 600 psig
1896 - 4137 kPa
Yellow
(25-1306)
85 psig
586 kPa
425 psig
2930 kPa
425 psig
2930 kPa
VRP-1000-CH 550 - 1000 psig
3792 - 6895 kPa
Yellow
(25-1306)
143 psig
990 kPa
700 psig
4826 kPa
700 psig
4826 kPa
VRP-1500-CH 800 - 1300 psig
5516 - 8964 kPa
Grey
(25-1562)
227 psig
1565 kPa
850 psig
5860 kPa
850 psig
5860 kPa
900 - 1500 psig
6205 - 10342 kPa
Violet
(25-8073)
276 psig
1903 kPa
950 psig
6550 kPa
950 psig
6550 kPa
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 7Copyright 2023 Baker Hughes Company. All rights reserved.
Principles of Operation
a wide range of applications. The energy for control valve
supply and discharge pressures.
flow is divided. One passage leads to the respective port of the
of the pilot.
a decrease in cylinder top pressure. The pressure differential
creates the force needed to close the valve and lessen the flow
Your VRP-CH pilot will come factory adjusted for your particular
Adjustment Procedure
The sensitivity adjustment drum in the center of the pilot
determines the sensitivity of the unit. The setpoint adjustment
screw determines the setpoint at which the pilot operates. The
Initial Adjustment
1. Adjust the supply regulator to the desired power gas pressure.
Refer to the original invoice paperwork supplied with the
product for the appropriate power gas pressure setting. It is
to the VRP-CH for proper operation of the system and all
volume of gas that is supplied to the VRP-CH. The stroking
speed of the system is proportional to the numerical value
Refer to Fine Tuning for more information on using unequal
Notes:
• If the VRP-CH is NOT equipped with VB Series Volume
see page 17.
Figure 1 - VRP-CH Pilot Principles of Operation
8 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
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).
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 9Copyright 2023 Baker Hughes Company. All rights reserved.
12 until setpoint is achieved.
VRP-CH.
15. Open the valve on the sensing line.
caution when putting the VRP-CH into service to prevent
unintended closure/opening of the control valve.
The regulator is now ready for service. The Initial Adjustments
desired setpoint. To achieve optimum accuracy of setpoint
completed.
Fine Tuning Procedures
setpoint while the VRP-CH is in service. No other adjustments
setpoint change per revolution of the control spring installed in
the pilot. Setpoint change per revolution of the control spring
In the event that the VRP-CH requires a change in the sensitivity
Any changes in the sensitivity adjustment affect the setpoint
Note:
also may rise if the temperature of the incoming gas changes.
drum in the proper direction.
(Pc
Example:
Power gas = 100 psig
Cylinder top = 65 psig
(65 + 35)/2 = 50 psig
Pc= 0.4*Ps(Equation 1.b)
pressure (Pc) in the appropriate equation. The cylinder top and
adjusting the sensitivity drum will require a re-adjustment to the
pilot setpoint.
Note:c) may fluctuate after VRP-
CH is put into service!
the control valve changes its position due to change in demand
(typically found in early morning conditions) the cylinder top
the difference in supply and discharge pressures. This occurs
(seats do not have enough time to recover).
of the power gas pressure.
or no readjustment.
Troubleshooting
fluctuates while position of the regulator does not change
(or changes very little).
The control pressure fluctuates while the regulator is
constantly changing its position.
Case # 1 – Regulator is too sensitive:
Turn the sensitivity adjustment drum to the left (increasing
adjustment drum.
WARNING: Do not turn the sensitivity adjustment drum to
the left (increasing numbers on the scale) more than one
full turn (11 numbers) from the initial 40 percent range
position. While certain VRP models will become insensitive
on even minimal rotation, turning more than one full turn
will guarantee excessive deadband on any VRP model.
10 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Case #2 – Regulator is not sensitive enough:
Note:
specified power gas to prevent equipment failure due to
overpressure.
Case #3 – Regulator is lagging behind changes in the
control pressure:
to move faster. Turn the sensitivity adjustment drum to the
setpoint adjustment screw clockwise to increase the setpoint
for the original desired pressure. Changing the setpoint will not
change the sensitivity.
increase the setpoint. Changing the setpoint will not change
the adjusted mode.
Inspection Procedure
the pilot to help ensure optimum performance. We recommend
from moving.
2. Close the valve on the sensing line.
sure to install each orifice into the hole from which it was
4. Turn on supply pressure.
pressure to full supply pressure is a sign of a worn pilot
8. Perform the internal friction test.
Internal Friction Test
Friction may occur if the diaphragms were not centered properly
during installation or dirt has accumulated inside the pilot. To
1. Adjust the pilot using the initial adjustment procedure.
adjusting screw slightly clockwise to decrease cylinder
(counterclockwise) direction. The gauge arrow should
immediately reverse.
3. Follow the reverse procedure on the cylinder top gauge.
Control Valve Type Opening
Orifice (#)
Closing
Orifice (#)
Sensitivity
Drum (%)
Ball Valve Regulator
w/VB-250 Bleeds to
atmosphere
1-1/2 4-1/2 0
Ball Valve Regulator
w/VB-250 Bleeds to a
pressure system
2 5 50
with or without VB-250
Bleeds to a pressure
system
2 6 80
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 11Copyright 2023 Baker Hughes Company. All rights reserved.
Annual Maintenance Checklist
Refer to Inspection Procedure on previous page.
2. ________ Check integrity of VRP-CH pilot seats. Refer to
3. ________ Soap test all diaphragm mating surfaces and the
pilot seal kit if necessary.
5. ________ Confirm power gas supply pressure is correct.
Refer to original Baker Hughes invoice paperwork
for proper power gas setting.
6. ________ Check sensitivity of the VRP-CH pilot. Confirm
8. ________ Perform an internal friction test. Refer to Page 10.
9. ________ Inspect and verify proper operation of all VRP-CH
accessories. Refer to technical manual included
with each specific instrumentation accessory for
further instruction.
Note:
instrumentation or instrumentation accessories on a regular
preventative maintenance.
Parts Ordering
The following is provided to allow the ordering of replacement
the stainless tag attached to the actuator piston also can provide
Key Description Part Number
1 Outside Piston 25-1018
2 O-Ring - 012 95-2615
3(1) 25-1030
4 35-1015
5 98-3180
6 Inside Piston 25-8247
7 1/4 - 28 Jam Nut 98-3214
8 Adjusting Drum 35-1520
9 25-1034
10 Buna-N Seat 25-1031
11 98-3089
12 1/2-20 Jam Nut 98-3056
13 Valve Adjusting Screw 25-8248
14 Washer 25-1016
15 Pilot Base 30-7005
16 98-2614
17 Pilot Post 25-8249
18(1) 98-3137
19 Diaphragm w. Convolute 25-1027
20 98-2629
21 25-8246
22 O-Ring - 010 95-2609
23 O-Ring - 014 95-2632
(1)
Seal Kit
Simply contact Baker Hughes and refer to the following part
VRP-CH Pilot Model Repair Kit Part No.
VRP-175-CH 30-9002
VRP-600-CH 30-9004
VRP-1000/1500-CH 30-9005
12 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
2
(c)
TRD (c) QTY FOR ITEM #16 WAS 2
7-99
N/A
1-19-99
12
21
16
34
6
5
1) ITEMS NO. 3, 18 AND 24 ARE
TORQUED TO 95-100 IN. Lbs.
17
16
15
14
13
18
19
20
11
10
9
8
7
2
1
VRP-CH BLANK ASSY.
NOTES:
30-0010
0
2
4
6
0
2
4
6
REP#
DRAWING NUMBER
REVISI0N
BY DATE
SEAT & NOZZLE DESIGN
REVISED:
DRAWN BY
DATE:
SCALE:
APPR0VED BY:
1-19-99
1:3/4
TS
N/A TS (a) ALL REF TOL WLD. ARE DONE
REVISED BY:
FIG.-1
FIG.-1 2
3
22
23
13
10
(b) REMOVE GAUGE MANIFOLD (35-1013)
6-99 (b) QTY FOR ITEM #5 WAS 4
TRD
(b)(d)
(b)
S.S.=
24
N/A 10-26-99 (d) #24 WAS ADDED BACK 35-1013
TS
VRP-CH Pilot Blank Parts
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 13Copyright 2023 Baker Hughes Company. All rights reserved.
Key Part
Number
Description
1 30-7022 Adjusting Screw
2 98-2500
3 30-7009 Seal Neck
4 98-3181 7/16 FT Washer (SS)
5 95-2672 O-ring - 108
6 30-7017 7/16 Thread Seal
7 95-2670 O-ring - 115
8 30-7008 Cartridge Cap for 175/600-CH
9 98-3137
10(2) 98-3269
only)
11 95-2671 O-ring - 141
12 30-7007
13 25-1306 Yellow Spring
14 30-7002 Spring Cart. for 75/600-CH
15 25-1062 Thrust Bearing
16 30-7006 Standard Bearing Case
17 30-7001 Bearing Nut
18 98-3213
19 98-3227
20 98-3228
175-CH
21 30-7003
22 98-3230
600-CH
(1)
(2)
175/600-CH Spring Chamber Assembly
Anodized Aluminium Part #30-0012
VRP-CH Pilot Spring Chambers Parts
14 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Key Part
Number
Description
1 30-7022 Adjusting Screw
2 98-2500
3 30-7009 Seal Neck
4 98-3181 7/16 FT Washer (SS)
5 95-2672 O-ring - 108
6 30-7017 7/16 Thread Seal
7 95-2670 O-rIng - 115
8 30-7008 Cartridge Cap for 1000/1500-CH
9 98-3137
10(2) 98-3269
1500-CH only)
11 95-2671 O-ring – 141
12 30-7007
13 30-7085
14 25-1306 Yellow Spring
15 25-1562 Grey Spring for 1500-CH (800-1300
psig)
16 25-8073 Violet Spring for 1500-CH (1000-1500
psig)
17 30-7023 Spring Cart. for 1000/1500-CH
18 30-7006 Standard Bearing Case
19 30-7027 Bearing Case for 1500-CH
20 30-7001 Bearing Nut
21 25-1062 Thrust Bearing
22 98-3227
23 98-3213 1/2’20 LH Jam Nut (316)
24 98-3229
25 30-7003
26 98-3231
(1)
(2)
1000/1500-CH Spring Chamber Assembly
Anodized Aluminium Part # 30-0013
17
20
21 22
23 24
25
26
16
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 15Copyright 2023 Baker Hughes Company. All rights reserved.
Key Part Number Description
1 30-7024 Cartridge Space
2 95-2656 O-rIng - 038
3 98-3056 1/2-20 Jam Nut (316)
4 30-7012 Diaphragm w/Hole
5 30-7015
6 98-3153
7 35-1549 Spacer
8 35-1548 Bottom Flange
9 30-7020 Washer
95-2615 O-ring - 012
11 98-3137
12 30-7025 Piston
175-CH Sensing Assembly
Anodized Aluminum* Part #30-0021
Key Part Number Description
1 98-3056 1/23-20 Jam Nut (316)
2 25-1027 Diaphragm w/Conv.
3 25-1156 Bottom Spacer
4 95-2615 O-rIng - 012
5 25-1177 Bottom Piston
Key Part Number Description
1 30-7016 Adapter Block
2 95-2665 O-ring - 145
3 98-3056 1/2-20 Jam Nut (316)
4 30-7015
5 30-7010 Small Piston
6 30-7014 Small Washer
7 30-7011 Conv. Diaphragm w/Hole
8 95-2615 O-ring - 012
9 30-7058 Top Spacer
600-CH Sensing Assembly
Anodized Aluminum* Part #30-0020
1000/1500-CH Sensing Assembly
Anodized Aluminum* Part #30-0019
VRP-CH Pilot Sensing Chambers Parts
16 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Flow Calculations
Qc1V 1
Critical Flow
Qc= critical flow across the inlet orifice in scfh
P1= supply pressure to the pilot in psig
Cv= flow factor
G = specific gravity of the gas
T = temperature of the gas in °F
Steady State Consumption
Qssc = steady state consumption
Qc1 = critical flow across the top orifice in scfh
Qc2
Cv
Qssc = Qc1 + Qc2
Supply Regulator Capacity
Qsrc = 2Qc
Qsrc = supply regulator capacity
Cv= 0.0869 (calculated with n = 6)
Travel Time
Minimum travel time (the time the valve takes to move from
deviates 5 percent or operation.
t1 G
T + 460
2
Cv
t = time in seconds
S = cylinder stroke in inches
D = cylinder diameter in inches
Cv
Cv(Booster) = 3.13
T= t122
Gas Consumption Table
Supply Gas
Pressure
(psig or psid)
Orifice Number
23456
100 29 56 90 130 176
150 41 80 130 187 253
200 54 105 169 244 330
250 66 129 210 301 407
Appendix
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 17Copyright 2023 Baker Hughes Company. All rights reserved.
PS Series Non-Bleed Sensor:
pressure and discharge gas pressure. See Page 7 for
initial pilot adjustment information.
Note:
VB Series Volume Boosters:
Provides additional volume capacity to the VRP-CH
for use with large volume control valve
require additional operating speed. The
-
response are controlled through the pilot
orifice and sensitivity drum. Refer to the
pilot initial adjustment procedures for
further information.
PS-2 Series Sensor Adjustments
1. Turn the adjusting screw of the PS-2 sensor clockwise
3/4-inch from the top of the spring
cartridge.
2. Adjust the VRP-CH according to the pilot adjustment
procedures.
3. Bleed off the sensing pressure.
4. Wait until the pressure reading on the cylinder top gauge is
equal to power gas.
gauge is equal to power gas.
7. Turnthe adjustingscrewof thePS-2sensor counterclockwise
Then turn the adjusting screw an additional half turn in the
same direction.
procedures for further information.
Troubleshooting
is achieved.
Accessories
operation or provide additional features to your VRP-CH
Baker Hughes.
SP Series Setpoint Change Pump:
Provides a simple and accurate method of
applying false signal pressure during initial
adjustment of the VRP pilot. The pump
can provide a false signal pressure of 10
devices.
Remote Setpoint Module:
Provides remote adjustment of VRP-B
pilot setpoint via an electrical signal.
Standard input signals are 24 VDC pulse
and 120 VAC pulse. A 4-20 mA input
AB Series Atmospheric Bleed Control:
Maintains minimum pressure differential
across the cylinder. AB control is required
to provide the necessary output to
operate the control valve under all design
conditions. See Page 7 for adjustment
information.
NBV Series No Bleed Valve:
without any adjustment. Selection
discharge gas pressure.
18 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Step 4. Install all -012 O-rings (J) on inside (I) and outside
(F) pistons. Install washers (K) on all pistons. Grooves on the
washers must face the diaphragms.
Step 5. Install convoluted diaphragms (L). Make sure they face
the direction shown.
Step 6
diaphragms (L) and fasten them with 1/2-20 jam nuts (N).
Step 7. Install 1/4-28 jam nut (M) and adjusting drum (P) in the
valve adjusting screw (F2). Connect the adjusting screw (F2)
Note: Jam nut (M) should touch the drum (P). This will allow free
drum rotation for adjustment.
Assembly Procedures
Note:
silicone grease.
Take special care to avoid applying grease to the diaphragm
Step 1
Step 2.
the piston surface.
Step 3. Attach the outside piston (F) to the pilot posts (G) with
-
Becker VRP-CH Series Valve Regulator Pilot Instruction Manual | 19Copyright 2023 Baker Hughes Company. All rights reserved.
Step 8. Place O-ring -010 (A) in the adjusting orifice (K2). Place
Step 9. Place O-ring -010 (A) in the nuts (M2) and secure the
adjusting orifice (K2) with nuts (M2) in the orifice manifold (M1)
as shown.
20 | Baker Hughes Copyright 2023 Baker Hughes Company. All rights reserved.
Note:
Step 10
Step 11
adjustment.
Step 12
and the four O-rings-012 (J) as shown.
Step 13. Bolt the gauge manifold (C2) and orifice manifold (M1)
as shown .
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