Becker VRP-B-CH Series

VRP-B-CH Pilot Selection ChartModel NumberSpring Color(Part Number)Setpoint Change perRevolution ofSetpoint ScrewSetpoint RangeDiscrete RemoteControl (SM-1100)Setpoint RangeAnalog (4-20 mA)Remote Control(SM-1000)320- 10- 69psigkPaGold(25-8236)0.57 psig3.9 kPa3.121psigkPa9psig62.1 kPa748- 30- 207psigkPaBeige(25-8238)2.0 psig13.7 kPa11 psig75.8 kPa23 psig159 kPa15103- 50- 345psigkPaBurgundy(25-8239)3.0 psig21 kPa16.5 psig114 kPa35 psig241 kPa20138- 85- 596psigkPaPink(25-8240)6.4 psig44 kPa35.2 psig243 kPa65 psig448 kPa50345- 175 psig- 1207 kPaYellow(25-1306)23 psig157 kPa125 psig862 kPa125 psig862 kPa534- 40- 276psigkPaGold(25-8236)2.1 psig14.6 kPa11.5 psig79 kPa35 psig241 kPa25172- 140- 965psigkPaBeige(25-8238)7.451psigkPa41 psig283 kPa115 psig793 kPa50345- 175 psig- 1207 kPaBurgundy(25-8239)11.3 psig78 kPa62 psig427 kPa125 psig862 kPa135931- 300 psig- 2069 kPaPink(25-8240)24 psig164 kPa132 psig910 kPa165 psig1138 kPa2751896- 600 psig- 4137 kPaYellow(25-1306)85 psig586 kPa425 psig2930 kPa425 psig2930 kPaVRP-B-1000-CH5503792- 1000 psig- 6895 kPaYellow(25-1306)143 psig990 kPa700 psig4826 kPa700 psig4826 kPaVRP-B-1500-CH8005516- 1300 psig- 8964 kPaGrey(25-1562)227 psig1565 kPa850 psig5860 kPa850 psig5860 kPa9006205- 1500 psig- 10342 kPaViolet(25-8073)276 psig1903 kPa950 psig6550 kPa950 psig6550 kPaVRP-B-175-CH(1)VRP-B-600-CH(1)Control Range(psig/kPa)These models should only be used for applications that require high gain. Consult Baker Hughes prior to selecting these models.Remote Setpoint Change Options The SM-1000 series motors accept a 24 VDC or 120VAC input. The SM-1100 series motors accept a 4-20 MAsignal and require a separate 24 VDC or 120 VAC powerconnection. 2021 Baker Hughes Company. All rights reserved. The total motor rotation is adjustable. The maximumnumber of motor rotations possible coupled with the springrate determines the total setpoint range.Becker VRP-B-CH Series Valve Regulator Pilot Instruction Manual 4

Principles of OperationThe Becker VRP-B-CH pilot and double-acting cylinderactuator can be used in conjunction with varying valve typesto provide a complete package for stable, accurate pressurecontrol over a wide range of applications. The energy forcontrol valve operation comes from the pressure differentialbetween the pilot supply and discharge pressures.The power gas channels through two adjustable orificeswhich feed the top and the bottom portion of the cylinderindependently.Both sides of the actuating cylinder are under full power gaspressure at steady state since both balanced valves areclosed.When the sensing pressure resides within the pilot deadbandregion, bleed gas is virtually eliminated. The pilot thereforeoperates on the design concept of a deadband within which anon-bleeding, force-balanced state is achieved. Deadband canbe defined as the amount of change necessary in the sensingpressure to the pilot to create a change in the output pressureto the cylinder.Figure 1a - VRP-B-CH Pilot principles of operationWhen the control pressure rises above the set point, the pilotpistons move downward. As the top inside piston unloads thecylinder top balance valve, the bottom piston moves awayfrom the balance valve plunger and maintains pressure onthe bottom of the actuator cylinder. This causes an increasein cylinder bottom pressure and a decrease in cylinder toppressure.The pressure differential creates the force needed to close thevalve and lessen the flow of gas. When the control pressurereturns to the setpoint, the pilot output pressures automaticallyreturn to power gas at the new valve position.If the control pressure falls below the setpoint, the oppositereaction takes place.The deadband region can be increased and decreased with thepilot’s sensitivity adjustment drum. Increasing the deadbandincreases the pilot’s error in controlling setpoint. Decreasingthe deadband reduces the error, with the tradeoff of increasingbleed gas. Therefore, deadband is adjusted to produce anadequate pilot response to a small change in sensing pressure,while producing the minimum amount of bleed gas while thepilot is in a steady state.Figure 1b - VRP-B-CH Pilot principles of operationThe variable orifices provide tuning of the stroking speed ofthe actuator. Increasing the variable orifice number increasesthe stroking speed. The two separate orifices allow tuning inboth directions to match the pilot response to a wide variety ofvalves and operating systems.Figure 1c - VRP-B-CH Pilot principles of operation5 Baker Hughes 2021 Baker Hughes Company. All rights reserved.

Adjustment ProceduresYour VRP-B-CH pilot will come factory adjusted for yourparticular application. The use of the adjustment procedureswill be necessary upon installation of a rubber goodsreplacement kit or any other disassembly or reassembly of thepilot.The sensitivity adjustment drum in the center of the pilotdetermines the sensitivity of the unit.The setpoint adjustment screw determines the setpoint atwhich the pilot operates. The variable orifices determine theresponse speed of the pilot.3. Disable DPS-2 series non bleed sensor (if equipped):The DPS-2 non bleed sensor should be disabled priorto commencing initial adjustment procedures. Failureto disable the DPS non bleed sensor may prevent initialadjustments from being completed properly. To disable theDPS-2 series non bleed sensor(s) rotate the adjustmentscrew of the DPS-2 until it extends approximately 1.75-infrom the top surface of the DPS-2 spring cartridge.4. Disable AB series atmospheric bleed control (if equipped):The AB series atmospheric bleed control should bedisabled prior to commencing initial adjustment procedures.Failure to disable the AB control may prevent initialadjustments from being completed properly. To disable theAB control rotate the adjustment screw of the AB controluntil it disengages. Then, tighten the nut on the AB sensoradjustment screw to seal threads on the cap.Initial Adjustment1. Adjust the supply regulatorAdjust the supply regulator to the desired power gaspressure. Refer to the original invoice paperwork suppliedwith the product for the appropriate power gas pressuresetting. It is imperative that adequate supply gas pressurebe supplied to the VRP-B-CH in order to ensure properoperation of the system and all accessories.5. Close cylinder block valves:2. Adjust the adjustable orificesThe adjustable orifices are used to control the volume ofgas that is supplied to the VRP-B-CH. The stroking speedof the system is proportional to the numerical value of theadjustable orifice. Adjustable orifice settings are typicallyequal for both orifices. However, a few applications mayrequire unequal settings for each adjustable orifice. Setboth orifices according to the table A below if pilot bleeds toatmosphere and table B if pilot bleeds to pressure system.Notes:To determine the cylinder bore, look at the modelnumber stamped on the stainless steel tag on the top ofthe cylinder. The cylinder bore will be the first numberfollowing the first capital letter “H”. This one or two digitnumber following the first “H” will be the diameter ininches and will be followed by another letter (for example,a unit with the model number 6H8F6FG-PCH has an 8-in.bore).If equipped with a DPS sensor and/or AB-control, seepage 20.Closing the cylinder block valves will isolate the VRP-B-CHfrom the control valve actuator. This prevents unintendedstroking of the control valve and simplifies setting theVRP-B-CH.6. Close the valve on the sensing line:It is imperative that a full-sealing valve be installed as closeto the sensing port of the VRP-B-CH as possible. Thevolume of gas between the VRP-B-CH sensing port andthe block valve on the sensing line should be minimized. Itis also imperative that the fittings between the VRP-B-CHsensing port and the sensing line block valve be bubbletight in order to facilitate adjustment. It is recommendedthat a quarter-turn (locking) ball valve be utilized to isolatethe VRP-B-CH sensing line.Confirm that the VRP-B-CH exhaust (discharge) line isopen. The discharge line is connected to the port marked“EX”. Should flow from the exhaust port be blocked,adjustment of the VRP-B-CH will not be possible.7. Initialize the sensitivity adjustment:Turn the sensitivity adjustment drum to the left (increasingnumbers on the scale) as far as it will turn. Then turn it one(1) complete rotation to the right (decreasing numbers onthe scale).Table A – Exhaust Vented to AtmosphereSupplyPressure(psig)Cylinder Bore (In.)4568101214Variable Orifice NumberUp to 50333445651-2002233455201-60022233451214Table B – Exhaust Vented to Pressure SystemSupplyPressure(psig)Cylinder Bore (In.)456810Variable Orifice NumberUp to 50333445651-2004445566201-6002223345 2021 Baker Hughes Company. All rights reserved.Becker VRP-B-CH Series Valve Regulator Pilot Instruction Manual 6

8. Apply a “False Signal” to the sensing port of theVRP-B-CH:The “False Signal” pressure should be equivalent to thedesired setpoint pressure. Refer to the original invoicepaperwork supplied with the product for the appropriatesetpoint pressure setting. If the adequate gas pressureis not available from the pipeline, a nitrogen bottle withregulator may be utilized to introduce the proper “FalseSignal” pressure. Additionally, an SP series setpointadjustment pump may be used to provide a false signalpressure above the available pipeline gas pressure.Note: It is recommended that a calibrated pressuregauge be used to ensure accuracy of the “False Signal”pressure.9.Adjust the setpoint adjustment screw:Turn the setpoint adjustment screw on top of the VRP-BCH unit until cylinder top and cylinder bottom pressuregauges show equal pressure. Clockwise rotation decreasescylinder bottom pressure. Turn setpoint adjustment onlywhen pressures are not equal.Note: For pilots venting to atmosphere in control,continue, otherwise, skip forward to the adjustmentsection for pilots bleeding to a pressure system.10. Final sensitivity drum adjustmentTurn the sensitivity adjustment to set the cylinder top andcylinder bottom equal to power gas pressure. When equal,the exhaust port should stop bleeding gas. If not, turn thesensitivity adjustment drum to the left (increasing numbers)until the exhaust port just stops bleeding.11. To check the deadband, Turn the setpoint adjustment screwclockwise until the cylinder bottom pressure just drops off.Then turn the setpoint adjustment screw counterclockwiseuntil the cylinder top pressure just drops off. Keep trackof the total rotation of the screw. Now place the setpointadjustment screw in the middle of this rotation.Turn the sensitivity adjustment drum to the right(decreasing numbers) until the exhaust port just startsbleeding gas. Check the total deadband again and repeatthis process until the deadband is eliminated and thefollowing criteria is met:With a 3/4 percent change in the sensing pressure (aboveand below setpoint), the cylinder top and cylinder bottompressure should develop a pressure differential equivalentto 20 percent of power gas.Example:Power gas 100 psigOrifice #3 top, #3 bottomSetpoint 400 psigWith a change of the sensing pressure to 403 psig, thecylinder top pressure should drop at least 20 psig.With a change of the sensing pressure to 397 psig, thecylinder bottom pressure should drop at least 20 psig.If the Pilot sensitivity is greater than this, bleed gas may furtherbe reduced by turning the sensitivity again to insure the pilotmeets the minimum criteria.For VRP-B-CH pilots bleeding to a pressure system10. Leave the pilot vent port attached to the system it normallydischarges to and insure this discharge line is open. Thepilot is properly adjusted when both gauges are equal atthe pilots desired setpoint, the cylinder pressure are setat 90 percent of the power gas, and any movement to theadjustment drum causes an immediate response from thepilot output gauges.11. Verify “False Signal”:Upon achieving setpoint, inspect the gauge whichmeasures the “False Signal.” If the “False Signal” hasdeviated, readjust it to attain proper pressure. Rememberthat the “False Signal” applied to the VRP-B-CH sensingport should be equivalent to the desired pressure setpointof the pilot. Upon readjustment of the “False Signal” repeatsteps 10 & 11 until setpoint is achieved.12. Remove “False Signal” pressure from sensing port ofVRP-B-CH.13. Open valve on sensing line.14. Open cylinder block valves:Opening the cylinder block valves will reestablishcommunication between the VRP-B-CH and the controlvalve actuator and put the system back into service.Exercise caution when putting the VRP-B-CH into serviceto prevent unintended closure/opening of the valve.Regulator is now ready for service.The initial adjustments are utilized to set the VRP-B-CH at apoint approximating the desired setpoint. In order to achieveoptimum accuracy of setpoint and sensitivity, the fine tuningprocedures need to be completed.Fine Tuning ProceduresTo change the VRP-B-CH setpoint only:In the case where the VRP-B-CH only requires a change insetpoint only, the setpoint adjustment may be rotated toachieve a new setpoint while the VRP-B-CH is in service.No other adjustments need to be made. Baker Hughesrecommends noting the setpoint change per revolution ofthe control spring installed in the pilot. Setpoint change perrevolution of the control spring can be found in the tableentitled VRP-B-CH Pilot Selection Chart on page 6 of thismanual.To change the VRP-B-CH sensitivity:In the event that the VRP-B-CH requires a change in to thesensitivity adjustment, the setpoint adjustment will also requireadjustment. Any changes in the sensitivity adjustment affectthe setpoint adjustment. A decrease (higher numbers) in thesensitivity of the pilot, will require the setpoint adjustment to bedecreased. An increase (lower numbers) in the sensitivity ofthe pilot, will require the setpoint adjustment to be increased.Once adjusted, the Becker VRP-B-CH pilot typically requiresvery little or no readjustment.7 Baker Hughes 2021 Baker Hughes Company. All rights reserved.

TroubleshootingControl problems generally fall into one of the followingthree categories:1. Regulator is too sensitive: Position of the regulator willchange frequently while control pressure is stable.2. Regulator is not sensitive enough: Control pressurefluctuates while position of the regulator does not change(or changes very little).3. Regulator is lagging behind changes in the controlpressure: The control pressure fluctuates while theregulator is constantly changing its position.Case # 1 Regulator is too sensitive:Turn the sensitivity adjustment drum to the left (increasingnumbers on the scale) by small increments. Typically goodcontrol is achieved within one or two divisions on the sensitivityadjustment drum.WARNINGDo not turn the sensitivity adjustment drum to the left(Increasing numbers on the scale) more than one fullturn (11 numbers) from the initial adjustment position.While certain VRP models will become insensitive oneven minimal rotation, turning more than one full turnwill guarantee excessive deadband on any VRP model.Case # 2 Regulator is not sensitive enough:The pilot should be able to meet the response cri

with genuine Becker control valve actuators. Should you already have existing control valve actuator(s) in service, the addition of a VRP-B-CH can improve performance and minimize atmospheric bleed emissions. Some compatible actuators: Bettis T-Series piston actuators Rotork Fisher Type 470 piston actuators Fisher Type .