GP-2000R

Bulletin No. AY-708
Model GP-2000R
Back Pressure Regulator
Installation, Operation
and Maintenance Instructions
Typical Back Pressure Regulator Installation
Control Pipe
(Pitch Down)
Gate
Valve
Armstrong
Strainer
Minimum of 10 Inlet
Pipe Diameters from
PRV to Last Valve
or Fitting
From Low Pressure
Flash System
GP-2000R
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 contact Armstrong International, Inc. or its local representative for additional
information.
Installation Instructions
1. An Armstrong Inverted Bucket Steam Trap is
recommended to drain condensate at inlet of regulator
if required.
2. An Armstrong Y-Strainer (100 mesh) should be
installed before the regulator to reduce the chance of
dirt fouling.
3. Pressure gauges should be installed before the
regulator. The upstream gauge should be installed in
or near the control pipe.
4. Control pipe connections go into ¼” tapping on the
side of the pilot valve. Be certain the pipe is pitched
away from the regulator. Erratic control could result if
this is not done. Control pipe length should be a
minimum of 10 inlet pipe diameters.
5. By-pass line around regulator will allow manual relief
while valve is being serviced.
6. Install regulator with diaphragm down and with flow in
the direction of the arrow on the body.
2. Move the sliding section (pilot valve, main spindle,
etc.) two to three times and confirm they move
smoothly. If they do not move smoothly, original
performance may be affected.
Spring Chart
Relieving Pressure
Color Code
3 to 21 psig
Yellow
14 - 157 psig
Green
143 - 200 psig
Brown
3. Replace gaskets with new ones when disassembling.
Steam may leak if gaskets are reused.
Confirm the valves before and after the regulator are
closed, including the valve in the control pipe. Also, make
sure that no pressure and drainage remains inside of the
regulator.
4. After the main valve, spring, and spring plate are
assembled correctly, mount the main diaphragm.
Incorrect assembly may affect the original performance.
Disassembly
5. Carry-out re-assembling in reverse order of disassembling. Tighten all hexagon bolts evenly on each bolt in
turn of diagonal position. When re-assembling the
product in the wrong order, proper function may not be
possible. Uneven tightening of bolts may cause
leakage of steam.
Pilot valve (Figure 3-1)
1. Slightly loosen lock nut (28) and turn adjusting screw
(27) counterclockwise to release adjusting spring (24)
(no compression).
New Tubing Set-Up
2. Remove bolts (37) of spring housing (3). Remove the
spring housing, spring, top spring plate (25), bottom
spring plate (26), and pilot diaphragms (23).
The external tubing for our GP-2000R series has been
modified to enhance the performance of these models.
The following explains the difference between the old and
new tubing assembly. It is important to have these fittings
in the correct location in order to get optimum 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.
3. Remove seal bellows (61) using a ring spanner or
socket wrench and remove gasket (62), pilot valve (63),
and pilot valve spring (64).
4. Remove pilot valve seat (65) using a socket wrench.
Main valve (Figure 3-1)
1. Remove pipe A (34) at fitting (30A) and tee (33).
New Type Tubing
Figure 5-1
2. For nominal sizes 1/2” to 1-1/2”, remove bolts (38) of
pilot body (2). Dismount the pilot body from the body
(1). And remove screen (15), spring plate (14), main
valve spring (13) and main valve (6). For series 2” to
6”, remove bolts of adapter plate and adapter from the
main body (1). Remove main valve spring (13) and
main valve (6).
Fitting A
A-Tube
B-Tube
Tee
Main diaphragm (Figure 3-1)
1. Remove pipe C (36) at tee (33).
Fitting B
C-Tube
2. Remove bolts (41) of bottom diaphragm case (5).
Dismount the bottom diaphragm case, main diaphragms (12), retainer (11), and spindle (9). Check that
spindle moves up and down freely and that no particulate or scale build-up is obstructing its performance.
Elbow
New Type Tubing
Reassembly
Fitting A
1. Check that there is no damage on the main valve,
main valve seat, pilot valve, and pilot valve seat. 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
the main valve and valve seat, carry out lapping to
remove them. If it is not possible to remove them,
replace with new parts. When any scratches exist on
the pilot valve and valve seat, replace with new parts.
Groove
(has to be on top)
Old Type Tubing
Fitting A
Tee
Check Mark
Tee
Fitting B
Fitting
Orifice
(Reduced Port)
Orifice
(Reduced Port)
Elbow
Elbow
Note: Fittings and tee are to be located in similar positions
for all GP-2000 models.
2
Troubleshooting Guide
Problem
Adjustment
is
impossible
Excessive
leakage.
Inlet pressure
increases
beyond the
prescribed
level.
Cause
Main diaphragm is damaged.
Orifice of tee fitting is clogged.
Solution
Remove pipe C (36) and open the by-pass valve. If fluid
runs out from the elbow replace main diaphragm.
Remove and clean it or replace.
Screen is clogged
Sensing pipe is clogged.
Remove and clean it or replace.
Remove and clean it or replace.
Pressure guage is malfunctioning.
Incorrect pressure is being used.
Check for foreign matter stuck to main valve and
main seat, or for scratches on these components.
Replace the pressure gauge.
Correct the pressure.
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.
Bellows seal is damaged.
If fluid runs out from joint when pressure is applied to inlet,
remove the pilot valve assembly to clean or replace it.
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.
Nominal size is too small for the application.
The amount of steam released (amount used) at
the regulating valve's outlet side is insufficient.
Repair or replace it.
Change to an appropriate nominal size.
Increase the amount of released steam.
Too much condensate collecting prior to the
regualtor.
The flow of steam is being obstructed at the outlet
pipe of the regulating valve.
The pipe diameter for outlet side is too small.
Install a steam trap.
Strainer placed in front of regulating valve is
clogged.
Movement of pilot valve is not smooth.
Flow at the connection of the sensing pipe
fluctuates excessively.
Excessive error Too much condensate collecting prior to the
regulator.
Drain is present in the sensing pipe.
Check the pipe diameter and the isolation valve to be sure it
is open.
Make a pipe diameter selection that will keep flow velocity
less than 6000 ft/min.
Disassemble and clean it.
Remove and clean or replace.
Examine the connections.
Install a steam trap.
Connect the sensing pipe in upward slope to the regulating
valve.
3
GP-2000-R Startup and Adjustment Procedures
Improper adjustment of the pressure reducing valve may cause hunting, improper control and possible damage to the
valve itself. Adjust the valve as follows:
1. Close the gate valves before and after the pressure
reducing valve and blow fluid through the by-pass line.
After draining, be sure to close the by-pass globe
valve.
4. Open the outlet valve to the full open position and then
slowly open the inlet side gate valve to the full open
position.
5. Slowly turn the adjusting screw clockwise until the
desired pressure is obtained while watching the
pressure gauge on the inlet side of the regulator.
Turning clockwise will increase the set pressure of the
back pressure regulator.
2. Turn the adjusting screw clockwise to close and
counterclockwise to open.
3. Close the pilot valve before opening up the steam inlet
valve.
6. After adjustment, tighten the lock nut.
GP-2000R Back Pressure Regulator
For Steam Service
Figure 3-1
Adjusting Screw (27)
Main Valve Seat (7)
Gasket (8)
Fitting (30A)
Rivet (43)
Nameplate (42)
Pipe A (34)
Bolt (37)
Body (1)
Spring Housing (3)
Top Spring Plate (25)
Plug (29)
Tee (33)
Adjusting Spring (24)
Guide (10)
Stud Bolt (39)
Lock Nut (28)
Bottom Spring Plate (26)
Pipe B (35)
Pilot Diaphragms (23)
Gasket (47)
Fitting (30B)
Seal Bellows (61)
Top Diaphragm
Case (4)
Gasket (62)
Pilot Valve (63)
Pilot Valve Spring (64)
Nut (40)
Pilot Valve Seat (65)
Main Spindle (9)
Plug (29)
E-Ring (53)
Retainer (11)
Bolt (38)
Gasket (22)
Upstream
Sensing Port
Fitting (55)
Main Diaphragms (12)
Pilot Body (2)
Gasket (16)
Bottom Diaphragm
Case (5)
Screen (15)
Spring Plate (14)
Adapter Plate for
2" NPT (Does Not
Require Spring
Retainer (11)
Bolt (41)
Plug (49)
Elbow (32)
Pipe C (36)
Main Valve Spring (13)
Main Valve (6)
Fitting (30C)
4
Tubing Assembly Instructions
1. All 2000 series valves with remote mount pilots
have the following similar parts: 1/4” long nipple (4),
1/4” x 1/4” short nipple (6), fitting B (13), and union
set (5). Use thread tape on the threads of
both nipples.
6. Thread the short nipple (6) into the pilot (2). The short
nipple (6) will thread into the bottom cap of the pressure pilot (2) remote mount.
7. Place fitting “A” (14) into the pilot and thread into
place. Note: This fitting is full port with no restriction
fitting (14). Use Teflon® tape on valve fittings.
2. Remove the 1/4” plug on the inlet side of the main
valve (1) with an allen wrench.
8. Once the union set (5) has been tightened it should be
facing the main valve (1). See remote mount drawing.
3. Thread the 1/4” long nipple (4) into the main valve (1) in
place of the 1/4” plug.
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.
4. Thread one-half of the union set (5) onto the long
nipple (4). Thread the other half onto the short nipple.
Part Listing
GP-2000R Remote Mount
Figure 4-1
6
5
14
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
2
15
4
1
8
10
9
13
12
7
10
5
Main Valve Body
Back Pressure Pilot
Temperature Pilot (not shown)
1/4” Long Nipple
Union Set
1/4” x 1/4” Short Nipple
B-Tube
C-Tube
D-Tube
Elbow
Capillary (Not Shown)
Tee
Fitting B
Fitting A
Upstream Sensing Port
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 the Armstrong factory. Except
as may be expressly provided in a written agreement between Armstrong and the user, which is signed by both parties,
Armstrong DOES NOT MAKE ANY OTHER REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. The sole and exclusive remedy with respect to the above
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 by Armstrong, however caused, and whether such claim is based upon warranty, contract, negligence, strict liability, or any other basis or theory, is limited to Armstrong’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, at Armstrong’s option, to repayment
of the purchase price. As a condition of enforcing any rights or remedies relating to Armstrong products, notice of any
warranty or other claim relating to the products must be given in writing to Armstrong: (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
giving rise to the claim, whichever is earlier. IN NO EVENT SHALL ARMSTRONG 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 Warranty and Remedy terms herein apply 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 by Armstrong.
Special Warranty Periods are as follows:
Flo-Rite-Temp Instantaneous Water Heater—The tube bundle shall have a 10-year guarantee against failure caused
by materials or workmanship provided by Armstrong but not against gasket failure or damage caused by corrosion,
water hammer or lack of proper cleaning.
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
guarantee against failure caused by materials or workmanship provided by Armstrong. Provided only clean potable
water is heated.
Armstrong-Yoshitake, Inc., 221 Armstrong Blvd., P.O. Box 408, Three Rivers, Michigan 49093 - USA Ph: (269) 279-3600 Fax: (269) 273-8656
Bulletin AY-708
10/02
www.armstrong-intl.com
Printed in U.S.A.

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