Armstrong GP-2000R Manual

Model GP-2000R
Back Pressure Regulator
Installation, Operation
and Maintenance Instructions
This bulletin should be used by experienced personnel as a guide to the installation of the Model GP-2000R Back
Pressure Regulator. Selection or installation of equipment should always be accompanied by competent technical
assistance. You are encouraged to contactArmstrong International, Inc. or its local representative for additional
information.
1. AnArmstrongInverted BucketSteam Trapis
recommendedto draincondensate atinlet ofregulator
ifrequired.
2. AnArmstrongY-Strainer(100 mesh)should be
installedbefore theregulator toreduce thechance of
dirtfouling.
3. Pressuregauges shouldbe installedbefore the
regulator. Theupstream gaugeshould beinstalledin
ornear thecontrolpipe.
4. Control pipe connections go into ¼” tapping on the
side of the pilot valve. Be certain the pipe is pitched
awayfromtheregulator. Erraticcontrol couldresultif
this is not done. Control pipe length should be a
minimumof10 inletpipe diameters.
5. By-passline aroundregulator willallow manualrelief
whilevalveisbeingserviced.
6. Installregulator withdiaphragm downandwithflowin
the direction of the arrow on the body.
Installation Instructions
Bulletin No. AY-708
Typical Back Pressure Regulator Installation
Control Pipe
(Pitch Down) Gate
Valve
Minimum of 10 Inlet
Pipe Diameters from
PRV to Last Valve
or Fitting
GP-2000R
Armstrong
Strainer
From Low Pressure
Flash System

2
Te e
C-Tube
Elbow
New Type Tubing Old Type Tubing
Fitting A
Check Mark
Fitting B
Fitting A
Groove
(has to be on top)
Fitting
Orifice
(Reduced Port)
Orifice
(Reduced Port)
Te e Te e
Elbow Elbow
Fitting B
B-Tube
Fitting A
A-Tube
Relieving Pressure Color Code
3to21psig Yellow
14 - 157 psig Green
143 - 200 psig Brown
Spring Chart
Confirmthevalvesbeforeandafter theregulatorare
closed, including the valve in the control pipe. Also, make
surethat nopressure anddrainage remainsinsideofthe
regulator.
Disassembly
Pilot valve (Figure 3-1)
1. Slightly loosen lock nut (28) and turn adjusting screw
(27)counterclockwise torelease adjustingspring (24)
(nocompression).
2. Remove bolts(37)of springhousing (3). Removethe
springhousing, spring,topspring plate(25), bottom
springplate (26),and pilotdiaphragms (23).
3. Removeseal bellows(61) usingaringspanneror
socketwrench andremove gasket(62),pilot valve(63),
andpilot valvespring(64).
4. Removepilot valveseat (65)using asocketwrench.
Main valve (Figure 3-1)
1. RemovepipeA(34)at fitting(30A) andtee (33).
2. Fornominal sizes1/2” to1-1/2”, removebolts(38) of
pilot body (2). Dismount the pilot body from the body
(1). Andremove screen(15), springplate (14),main
valvespring (13)and mainvalve(6). Forseries2” to
6”,remove boltsof adapterplate andadapterfrom the
mainbody (1). Removemainvalve spring(13)and
mainvalve(6).
Main diaphragm (Figure 3-1)
1. Removepipe C(36) attee(33).
2. Removebolts (41)of bottomdiaphragmcase(5).
Dismountthe bottomdiaphragmcase,maindia-
phragms(12), retainer(11),and spindle(9). Checkthat
spindlemoves upand downfreely andthat noparticu-
late or scale build-up is obstructing its performance.
Reassembly
1. Checkthat thereis nodamage onthemain valve,
mainvalve seat,pilot valve,and pilotvalveseat. If any
scratches exist on the seating surface of valve seat,
they may cause an increase in outlet pressure and
excess temperature. When any scratches exist on
themain valveand valveseat,carryoutlapping to
remove them. If it is not possible to remove them,
replace with new parts. When any scratches exist on
thepilot valveand valveseat,replacewithnew parts.
2. Movethe slidingsection (pilotvalve, mainspindle,
etc.) two to three times and confirm they move
smoothly. If they do not move smoothly, original
performancemay beaffected.
3. Replacegaskets withnew oneswhen disassembling.
Steam may leak if gaskets are reused.
4. Afterthe mainvalve, spring,and springplate are
assembledcorrectly, mountthe maindiaphragm.
Incorrect assembly may affect the original perfor-
mance.
5. Carry-outre-assembling inreverseorder ofdisassem-
bling. Tighten all hexagon bolts evenly on each bolt in
turnof diagonalposition. When re-assemblingthe
productin thewrong order,proper functionmay notbe
possible. Uneventighteningof boltsmay cause
leakageof steam.
New Tubing Set-Up
Theexternal tubingfor ourGP-2000Rseries hasbeen
modifiedto enhancethe performanceof thesemodels.
Thefollowing explainsthedifferencebetweenthe oldand
new tubing assembly. It is important to have these fittings
inthecorrect locationin orderto getoptimum performance
from these valves. It is very important that the old and new
tubing assemblies are not mixed. The location of all
fittings is critical and should not vary from the assembly
instructions.
New Type Tubing
Figure 5-1
Note: Fittings and tee are to be located in similar positions
forall GP-2000models.

3
Troubleshooting Guide
Problem
Cause
Solution
Main diaphragm is damaged. Remove pipe C (36) and open the by-pass valve. If fluid
runs out from the elbow replace main diaphragm.
Orifice of tee fitting is clogged. Remove and clean it or replace.
Screen is clogged Remove and clean it or replace.
Sensing pipe is clogged. Remove and clean it or replace.
Pressure guage is malfunctioning. Replace the pressure gauge.
Incorrect pressure is being used. Correct the pressure.
Check for foreign matter stuck to main valve and
main seat, or for scratches on these components. Remove pipe A (34). If fluid runs out from tee when
pressure is applied to the inlet side of the regulating valve at
a pressure below the setting level, clean the main valve and
main valve seat. When any scratches are identified, lap the
main valve and main valve seat.
Check for foreign matter stuck to pilot valve and
pilot valve seat, or for scratches on these
components.
If fluid runs out from joint when pressure is applied to inlet,
remove the pilot valve assembly to clean or replace it.
Bellows seal is damaged. Remove the joint (to pilot body). If fluid runs out from the
joint when it is supplied from pressure sensing port, replace
the bellows seal.
Fluid leaks from by-pass valve. Repair or replace it.
Nominal size is too small for the application. Change to an appropriate nominal size.
The amount of steam released (amount used) at
the regulating valve's outlet side is insufficient. Increase the amount of released steam.
Too much condensate collecting prior to the
regualtor. Install a steam trap.
The flow of steam is being obstructed at the outlet
pipe of the regulating valve.
Check the pipe diameter and the isolation valve to be sure it
is open.
The pipe diameter for outlet side is too small. Make a pipe diameter selection that will keep flow velocity
less than 6000 ft/min.
Strainer placed in front of regulating valve is
clogged. Disassemble and clean it.
Movement of pilot valve is not smooth. Remove and clean or replace.
Flow at the connection of the sensing pipe
fluctuates excessively. Examine the connections.
Too much condensate collecting prior to the
regulator. Install a steam trap.
Drain is present in the sensing pipe. Connect the sensing pipe in upward slope to the regulating
valve.
Adjustment
is
impossible
Excessive
leakage.
Inlet pressure
increases
beyond the
prescribed
level.
Excessive error

4
GP-2000-R Startup and Adjustment Procedures
Improperadjustment ofthe pressurereducing valvemay causehunting,impropercontroland possibledamage tothe
valve itself. Adjust the valve as follows:
1. Closethe gatevalvesbefore andafter thepressure
reducingvalve andblowfluidthroughthe by-passline.
After draining, be sure to close the by-pass globe
valve.
2. Turn the adjusting screw clockwise to close and
counterclockwise to open.
3. Closethe pilotvalve before openingup thesteam inlet
valve.
4. Openthe outletvalve tothe fullopen positionand then
slowly open the inlet side gate valve to the full open
position.
5. Slowly turn the adjusting screw clockwise until the
desiredpressure isobtained whilewatching the
pressuregauge onthe inletsideoftheregulator.
Turning clockwise will increase the set pressure of the
backpressure regulator.
6. After adjustment, tighten the lock nut.
GP-2000R Back Pressure Regulator
For Steam Service
Figure 3-1
Plug (49)
Elbow (32)
Fitting (30C)
Bolt (41)
Pipe C (36)
Fitting (30B)
Pipe B (35)
Tee (33)
Plug (29)
Pipe A (34)
Fitting (30A) Rivet (43)
Nameplate (42)
Bolt (37)
Plug (29)
Upstream
Sensing Port
Fitting (55)
Adapter Plate for
2" NPT (Does Not
Require Spring
Retainer (11)
Main Valve (6)
Main Valve Spring (13)
Spring Plate (14)
Screen (15)
Gasket (16)
Pilot Body (2)
Gasket (22)
Bolt (38)
Pilot Valve Seat (65)
Pilot Valve Spring (64)
Pilot Valve (63)
Gasket (62)
Seal Bellows (61)
Pilot Diaphragms (23)
Bottom Spring Plate (26)
Adjusting Spring (24)
Top Spring Plate (25)
Spring Housing (3)
Lock Nut (28)
Adjusting Screw (27)
Bottom Diaphragm
Case (5)
Main Diaphragms (12)
Retainer (11)
E-Ring (53)
Main Spindle (9)
Nut (40)
Top Diaphragm
Case (4)
Gasket (47)
Stud Bolt (39)
Guide (10)
Body (1)
Gasket (8)
Main Valve Seat (7)

5
2
15
9
13
7
10
12
8
10
1
4
5
6
14
Tubing Assembly Instructions
1. All2000 seriesvalves withremotemountpilots
havethe followingsimilar parts:1/4” longnipple (4),
1/4” x 1/4” short nipple (6), fitting B (13), and union
set (5). Use thread tape on the threads of
bothnipples.
2. Remove the 1/4” plug on the inlet side of the main
valve(1) withanallen wrench.
3. Threadthe 1/4”long nipple(4) intothemainvalve(1) in
place of the 1/4” plug.
4. Threadone-half ofthe unionset (5)onto thelong
nipple(4). Thread theotherhalfontothe shortnipple.
GP-2000R Remote Mount
Figure 4-1
6. Thread the short nipple (6) into the pilot (2). The short
nipple (6) will thread into the bottom cap of the pres-
surepilot (2)remotemount.
7. Place fitting “A” (14) into the pilot and thread into
place. Note: This fitting is full port with no restriction
fitting(14). UseTeflon®tape onvalve fittings.
8. Once the union set (5) has been tightened it should be
facingthe mainvalve (1). Seeremote mountdrawing.
9. Connect the “S” shaped D-tube (9) to the outlet of the
pressure pilot at fitting “A” (14) and to the top of the
tee (12) and tighten. Note: Make sure the downstream
sensing port (15) on the pilot faces upstream.
Part Listing
1. MainValveBody
2. Back Pressure Pilot
3. TemperaturePilot (notshown)
4. 1/4”Long Nipple
5. UnionSet
6. 1/4” x 1/4” Short Nipple
7. B-Tube
8. C-Tube
9. D-Tube
10. Elbow
11. Capillary(NotShown)
12. Tee
13. Fitting B
14. Fitting A
15. Upstream SensingPort

Limited Warranty and Remedy
Armstrong-Yoshitake, Inc. (“Armstrong”) warrants to the original user of those products supplied by it and used in the
service and in the manner for which they are intended, that such products shall be free from defects in material and
workmanship for a period of one (1) year from the date of installation, but not longer than 15 months from the date of
shipment from the factory [unless a Special Warranty Period applies, as listed below]. This warranty does not extend to
any product that has been subject to misuse, neglect, or alteration after shipment from theArmstrong factory. Except
as may be expressly provided in a written agreement betweenArmstrong and the user, which is signed by both parties,
ArmstrongDOES NOT MAKEANYOTHER REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO,ANY IMPLIED WARRANTYOF MERCHANTABILITY ORANY IMPLIED WAR-
RANTY OF FITNESS FORA PARTICULAR PURPOSE.Thesoleand exclusiveremedy withrespectto theabove
limited warranty or with respect to any other claim relating to the products or to defects or any condition or use of the
products supplied byArmstrong, however caused, and whether such claim is based upon warranty, contract, negli-
gence, strict liability, or any other basis or theory, is limited toArmstrong’s repair or replacement of the part or product,
excluding any labor or any other cost to remove or install said part or product, or, atArmstrong’s option, to repayment
of the purchase price.As a condition of enforcing any rights or remedies relating toArmstrong products, notice of any
warranty or other claim relating to the products must be given in writing toArmstrong: (i) within 30 days of last day of
the applicable warranty period, or (ii) within 30 days of the date of the manifestation of the condition or occurrence
givingriseto theclaim, whicheveris earlier.IN NO EVENT SHALLARMSTRONG BE LIABLE FOR SPECIAL, DIRECT,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT LIMITED TO, LOSS OF USE OR
PROFITS OR INTERRUPTION OF BUSINESS.The Limited Warrantyand Remedyterms hereinapply notwithstanding
any contrary terms in any purchase order or form submitted or issued by any user, purchaser, or third party and all
such contrary terms shall be deemed rejected byArmstrong.
Special Warranty Periods are as follows:
Flo-Rite-Temp Instantaneous Water Heater—The tubebundle shall havea 10-yearguarantee against failurecaused
by materials or workmanship provided byArmstrong but not against gasket failure or damage caused by corrosion,
waterhammeror lackof propercleaning.
Flo-Rite-Temp Packaged Instantaneous Water Heater—
Two (2) years from the date of installation, but not longer than 27 months from the date of shipment.
Flo-Direct Gas Fired Water Heater—The stainless steel structure and stainless steel internals shall have a 5-year
guaranteeagainstfailure causedby materialsor workmanshipprovided byArmstrong. Provided onlyclean potable
waterisheated.
Armstrong-Yoshitake, Inc., 221 Armstrong Blvd., P.O. Box 408, Three Rivers, Michigan 49093 - USA Ph: [phone] Fax: [phone]
www.armstrong-intl.com
Bulletin AY-708 10/02 Printed in U.S.A.