GORMAN-RUPP GRP33-08A Application guide

OM-06823-01
December 14, 2015
Rev. D 09‐24‐18
GORMAN‐RUPP PUMPS
www.grpumps.com
e2015 Gorman‐Rupp Pumps Printed in U.S.A.
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
WITH PARTS LIST
ACCESSORIES
MODELS
JS4D20-E9.4 230V 3P JS4D20-E9.4 230V 3P
MODELS
GRP33‐08A and GRP33-08B
AIR RELEASE VALVES

TABLE OF CONTENTS
i
INTRODUCTION PAGE I - 1.................................................
WARNINGS - SECTION A PAGE A - 1.......................................
INSTALLATION - SECTION B PAGE B - 1....................................
PREINSTALLATION INSPECTION PAGE B - 1............................................
AIR RELEASE VALVE INSTALLATION PAGE B - 1........................................
Air Release Valve Venting PAGE B - 1...............................................
OPERATION - SECTION C PAGE C - 1......................................
TROUBLESHOOTING - SECTION D PAGE D - 1..............................
PUMP MAINTENANCE AND REPAIR - SECTION E PAGE E - 1................
PARTS LISTS:
GRP33-06A Air Release Valve PAGE E - 3..........................................
GRP33-06B Air Release Valve PAGE E - 5..........................................
GRP33-08 Air Release Valve PAGE E - 7............................................
GRP52-01A Installation Kit PAGE E - 8.............................................
GRP52-03A Installation Kit PAGE E - 9.............................................
GRP52-04A Installation Kit PAGE E - 10.............................................
GRP52-05A and GRP52-05B Installation Kit PAGE E - 11.............................
GRP 33-06A & GRP 33-06B AIR RELEASE VALVE
DISASSEMBLY AND REASSEMBLY PAGE E - 12..........................................
GRP 33-08 AIR RELEASE VALVE DISASSEMBLY AND REASSEMBLY PAGE E - 13...........

ACCESSORIES OM-06823
PAGE I - 1INTRODUCTION
INTRODUCTION
This manual contains installation, operation, and
maintenance instructions for the Gorman‐Rupp
GRP33-08A and GRP33-08B Air Release Valves
and corresponding GRP52 Air Release Valve In
stallation Kits. Read this manual carefully to learn
how to safely install and maintain your Air Release
Valve. Failure to do so could result in personal in
jury or damage to the pump.
The Air Release Valves are designed to work in
conjunction with the integral priming pump and
priming tubes installed between the valve, priming
pump and the pump suction. Air or vapor expelled
by the priming pump during initial priming or
re‐priming is directed through the Air Release
Valve, thereby permitting the priming pump to
prime the centrifugal pump against relatively high
discharge heads.
If there are any questions regarding the pump or
Air Release Valve application which are not cov
ered in this manual or in other literature accompa
nying this unit, please contact your Gorman‐Rupp
distributor, or The Gorman‐Rupp Company:
The Gorman‐Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901-1217
Phone: [phone]
or:
Gorman‐Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
Phone: [phone]
HAZARD AND INSTRUCTION
DEFINITIONS
The following are used to alert maintenance per
sonnel to procedures which require special atten
tion, to those which could damage equipment, and
to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
Hazards or unsafe practices which COULD
result in minor personal injury or product
or property damage. These instructions
describe the requirements and the possi
ble damage which could result from failure
to follow the procedure.
NOTE
Instructions to aid in installation, operation,and
maintenance, or which clarify a procedure.

ACCESSORIES OM-06823
PAGE A - 1SAFETY
SAFETY ‐ SECTION A
This information applies to Gorman‐
Rupp GRP33-08A and GRP33-08B Air
Release Valves and corresponding in
stallation kits. Refer to the manual ac
companying the pump and power
source before attempting to begin oper
ation.
If the pump is installed within a closed
building such as a pump house, route
the Air Release Valve vent line to the
outside of the building. The complete
installation must be in accordance with
national and local codes.
Before operating or servicing the Air
Release Valve or pump, be certain prop
er safety practices are followed. Pro
vide adequate ventilation, prohibit
smoking, wear static‐resistant clothing
and shoes. Clean up all fuel spills imme
diately after occurrence.
Before attempting to open or service the
Air Release Valve or pump:
1. Familiarize yourself with this man
ual.
2. Disconnect or lock out the power
source to ensure that the pump will
remain inoperative.
3. Allow the pump and liquid to cool if
overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.

ACCESSORIES OM-06823
PAGE B - 1INSTALLATION
INSTALLATION - SECTION B
Review all safety information in Section A.
Since pump installations are seldom identical, this
section offers only general recommendations and
practices required to inspect and install the
GRP33-08A and GRP33-08B Air Release Valves.
Refer to the literature accompanying the pump, or
contact the factory for specific pump installation in
structions. Refer to MAINTENANCE AND
REPAIR, Section E in this manual for disassembly
and reassembly of the Air Release Valves and spe
cific installation instructions for each of the Air Re
lease Valve Installation Kits.
The Air Release Valves will not serve as throttling
valves or check valves in the system piping. If the
application involves static discharge head or suc
tion pressure, a system check valve must be in
stalled to prevent siphoning or loss of prime
through the pump.
The integral Roto‐Primerpriming pump and Air
Release Valve work in conjunction with three tube
assemblies. During operation, one tube draws va
por from the suction side of the centrifugal pump to
the suction port of the priming pump. Another tube
discharges the vapor into the air release. The third
tube returns any accumulated liquid in the bottom
of the cylindrical air release chamber to the suction
side of the centrifugal pump. See OPERATION,
Section C for further details.
NOTE
Since the “RS” model Roto‐Primerpumps require
internal changes to facilitate proper installation and
function of the Air Release Valve, it is recom
mended that the valve be ordered as a factory‐ins
talled option only. The valve may be easily added to
“RD” model pumps with no internal modifications
required.
PREINSTALLATION INSPECTION
Before installation, inspect the Air Release Valve
and all piping and fittings for damage which may
have occurred during shipment. Check as follows:
a. Check the Air Release Valve assembly for
cracks, dents, damaged threads and other
obvious damage.
b. Check for proper quantities of tubing, fittings,
and mounting hardware supplied with the Air
Release Valve. Check all components for
shipping damage.
AIR RELEASE VALVE INSTALLATION
Remove the pump casing and priming pump drain
plugs and drain the pump. Clean and reinstall the
drain plugs.
Refer to the appropriate Air Release Valve Kit instal
lation drawing in MAINTENANCE AND REPAIR,
Section E, and follow the instructions provided.
Before starting the pump, vent the Air Release
Valve as described below the provide safe opera
tion.
Air Release Valve Venting
For normal venting of the Air Release Valve, re
move the plastic shipping plug in the head of the
valve. It is suggested that a length of pipe or tubing
be installed in the threaded opening so that haz
ardous vapors can be carried away from the imme
diate vicinity of the pump.
NOTE
When two pumps equipped with Air Release Valves
are installed in parallel, a check valve must be in
stalled in the venting lines.
If the pump is installed in a closed build
ing such as a pump house, route the Air
Release Valve vent line to the outside of
the building. The complete installation
must be in accordance with National
and local codes.

OM-06823
ACCESSORIES
OPERATION PAGE C - 1
OPERATION - SECTION C
Review all safety information in Section A.
When properly installed, the Air Release Valve al
lows the integral Roto‐Primerpriming pump to
overcome relatively high static discharge heads or
back pressure during the priming cycle. Figure 1
shows a schematic configuration of the valve and
is keyed to the following description of operation.
DISCHARGE LINE CHECK
VALVE (MANDATORY) VENT TO OUTSIDE IF INSTALLED
IN PUMP HOUSE (CHECK VALVE
REQUIRED ON DUPLEX
INSTALLATION ONLY)
AIR RELEASE
SUCTION LINE
GORMAN‐RUPP SELF‐PRIMING
CENTRIFUGAL PUMP
DISCHARGE LINE
A
B
C
D
E
Figure 1. Gorman‐Rupp Air Release Valve Connected to Roto‐PrimerPump
The Air Release Valve is designed with an air valve
in the head of the assembly and a sump valve in the
bases. These valves are controlled by a common
rod that is moved vertically by an attached float.
When the pump is started, air is drawn from the
suction line into the priming pump, and directed
through the discharge tube “B” to the Air Release
Valve. This air and vapor is then vented to atmo
sphere through the valve head.
With the float down, sump valve “E” is closed; air
cannot re‐enter the suction piping through the re
turn tube assembly “C”.
As product fills the pump casing, the impeller de
velops pressure, opening the check valve “D” in
the discharge piping. The priming pump delivers
product and fills the float chamber, causing the
float to rise, which opens the sump valve “E” and
closes the air valve.
The product recirculates through the return tube
assembly “C” to the pump suction. The liquid pres
sure equalizes the priming pump spring pressure,
and the priming pump slides into neutral. At this
point, the pump is fully primed.
In the neutral position, the priming pump circulates
a small amount of liquid through the discharge
tube to the float chamber and back to the pump
suction through the return tube.
If air or vapor enters the suction piping during the
pumping operation, the discharge line check valve
closes again, and the priming pump again evacu
ates the air through the Air Release Valve.

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
VALVE FAILS TO
RELEASE AIR
PRODUCT ESCAP
ING FROM VENT
LINE
Priming tube improperly connected to
pump or valve.
Check installation diagram (see
Section B). Correct piping.
Integral priming pump malfunction
ing.
Refer to Operator's Manual accom
panying the centrifugal pump for
repair instruction.
Check valve at pump discharge port
not installed or seating improperly.
Install check valve or inspect for free
movement and proper seating.
Small in‐line check valve (used in stan
dard Roto‐Primerconfiguration) not
removed prior to installation of Air Re
lease Valve priming line.
Remove in‐line check valve.
Valve floats sticking or out of adjust
ment.
Check the valve floats for free
movement. Adjust valve head at
top of cylinder (see Section E, Fig
ure 1 for dimensions).
Priming lines pinched or broken. Straighten or replace line(s).
Priming tube improperly connected to
pump or valve.
Check installation diagram (see
Section B). Correct piping.
Check valve at pump discharge port
not installed or seating improperly.
Install check valve or inspect for free
movement and proper seating.
Valve floats sticking or out of adjust
ment.
Check the valve floats for free
movement. Adjust valve head at
top of cylinder (GRP33-06A and
GRP33-06B Valves only, see Sec
tion E, Figure 1 for dimensions).
Valve seat contaminated or worn. Clean needle valve and seat. Re
place worn parts.
PRODUCT LEAKS
FROM VALVE OR
PIPING
Priming lines pinched or broken. Straighten or replace line(s).
Gaskets damaged, pipe fittings loose. Replace damaged parts, tighten
fittings.
OM-06823ACCESSORIES
TROUBLESHOOTING PAGE D - 1
TROUBLESHOOTING - SECTION D
Review all safety information in Section A.

ACCESSORIES OM-06823
MAINTENANCE & REPAIR PAGE E - 1
MAINTENANCE AND REPAIR ‐ SECTION E
MAINTENANCE AND REPAIR OF THE AIR RELEASE VALVE PARTS WILL MAINTAIN PEAK
OPERATING PERFORMANCE.
GRP33-08A and GRP33-0BB Air Release Valves
are compatible with most petroleum products, in
cluding liquids that contain a volume of ethanol
greater than 85%.
Repair parts for the Air Release Valves are identi
fied in Figures 1 and 2 and the accompanying parts
lists in this section.
The table below lists the Installation Kit and corre
sponding Air Release Valve designed for your
pump model. The kits include the Air Release
Valve, priming tubes, pipe fittings and mounting
hardware.
If the Air Release Valve was purchased as standard
equipment (“-BAR” model pumps), refer to the
manual shipped with the pump to identify priming
tubes, fittings and mounting hardware. If the Air
Release Valve and tubing was purchased for re
placement or as a retrofit for a “-B” pump model,
refer to the Installation document provided with the
kit.
Air Release Valve Installation Kit Cross Reference
PUMP
MODEL
INSTALLATION
KIT
AIR RELEASE
VALVE
RD2A31-B GRP52-11A GRP33-08A
RD2A31-BAR GRP52-11A GRP33-08A
RD3A31-B GRP52-12A GRP33-08A
RD3A31-BAR GRP52-12A GRP33-08A
RD3A32-B GRP52-12B GRP33-08B
RD3A32-BAR GRP52-12B GRP33-08B
RD4A31-B GRP52-13A GRP33-08A
RD4A31-BAR GRP52-13A GRP33-08A
RD4A32-B GRP52-13B GRP33-08B
RD4A32-BAR GRP52-13B GRP33-08A
RS2A31-B GRP52-14A GRP33-08A
RS2A31-BAR GRP52-14A GRP33-08A
RS2A32-BAR GRP52-14B GRP33-08B
RS3A31-B GRP52-15A GRP33-08A
RS3A31-BAR GRP52-15A GRP33-08A
RS3A32-B GRP52-15B GRP33-08B
RS3A32-BAR GRP52-15B GRP33-08B
RS5A31-BAR GRP52-16A GRP33-08A
RS5A32-BAR GRP52-16B GRP33-08B

ACCESSORIESOM-06823
MAINTENANCE & REPAIRPAGE E - 2
PARTS PAGE
SECTION DRAWING
Figure 1. GRP33-08A Air Release Valve

ACCESSORIES OM-06823
MAINTENANCE & REPAIR PAGE E - 3
PARTS LIST
GRP33-08A Air Release Valve
ITEM
NO. PART NAME PART NUMBER QTY
1GASKET 38681-021 19060 1
2 VALVE SEAT N16727-01 17010 1
3 FLOAT ROD 31361-017 17000 1
4 PLUNGER PAD 31115-008 13150 1
5 LOCK WASHER J06 15991 8
6 HEX HEAD CAP SCREW B0605 15991 8
7 AIR ELIMINATOR FLOAT 38349-418 17000 1
8 COTTER PIN 21126-712 2
9 DRIVE PIN 21144-058 1
10 PIPE PLUG P06 15079 1
11 PIPE PLUG P02 15079 1
12 FLOAT CHAMBER 38344-008 11010 1
13 O‐RING 25152-256 1
14 AIR RELEASE VALVE ASSEMBLY 46431-822 1
15 -AIR RELEASE ADAPTOR 38344-009 11010 1
16 -GASKET 38681-827 18000 1
17 -SOCKET HD CAP SCREW BD0608 15991 6
18 -CAP ASSEMBLY 41888-257 1
--RUBBER SEAT 31131-101 19060 1
NOT SHOWN:
PLASTIC CLOSURE 25141-039 2
PLASTIC CLOSURE 25141-007 1
INDICATES PARTS RECOMMENDED FOR STOCK

ACCESSORIESOM-06823
MAINTENANCE & REPAIRPAGE E - 4
SECTION DRAWING
Figure 2. GRP33-08B Air Release Valve

ACCESSORIES OM-06823
MAINTENANCE & REPAIR PAGE E - 5
PARTS LIST
GRP33-08B Air Release Valve
ITEM
NO. PART NAME PART NUMBER QTY
1GASKET 38681-021 19060 1
2 VALVE SEAT N16727-01 17010 1
3 FLOAT ROD 31361-017 17000 1
4 PLUNGER PAD 31115-008 13150 1
5 LOCK WASHER J06 15991 8
6 HEX HEAD CAP SCREW B0605 15991 8
7 AIR ELIMINATOR FLOAT 38349-418 17000 1
8 COTTER PIN 21126-712 2
9 DRIVE PIN 21144-058 1
10 PIPE PLUG P06 15079 1
11 PIPE PLUG P02 15079 1
12 O‐RING 25152-256 1
13 FLOAT CHAMBER 46431-825 24150 1
14 AIR RELEASE VALVE ASSEMBLY 46431-826 1
15 -AIR RELEASE ADAPTER 38344-009 10140 1
16 -GASKET 38681-827 18000 1
17 -SOCKET HEAD CAPSCREW BD0608 15991 6
18 -CAP ASSEMBLY 41888-403 1
--RUBBER SEAT 31131-101 19060 1
NOT SHOWN:
PLASTIC CLOSURE 25141-039 2
PLASTIC CLOSURE 25141-007 1
INDICATES PARTS RECOMMENDED FOR STOCK

ACCESSORIESOM-06823
MAINTENANCE & REPAIRPAGE E - 6
GRP33-08A AND GRP 33-08B
AIR RELEASE VALVE
DISASSEMBLY AND REASSEMBLY
Review all safety information in Section A.
The GRP33-08A and GRP33-08B Air Release
Valves requires little service due to their rugged,
minimum maintenance design. However, if it be
comes necessary to inspect or replace parts, fol
low these instructions, which are keyed to the sec
tional views (see Figures 1 and 2) and the accom
panying parts lists.
Before attempting to service the Air Release Valve,
disconnect or lock out the power supply to the
pump to prevent accidental start‐up. Close all
valves in the suction and discharge piping and
drain the pump casing and group grind. Refer to
the literature accompanying the pump for mainte
nance and repair of the pump and group grind.
Before operating or servicing the Air
Release Valve or pump, be certain prop
er safety practices are followed. Pro
vide adequate ventilation, prohibit
smoking, wear static‐resistant clothing
and shoes. Clean up all fuel spills imme
diately after occurrence.
Before attempting to open or service the
Air Release Valve or pump:
1. Familiarize yourself with this man
ual.
2. Disconnect or lock out the power
source to ensure that the pump will
remain inoperative.
3. Allow the pump and liquid to cool if
overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
Use Only Genuine Gorman-Rupp re
placement parts. Failure to do so may cre
ate a hazard and damage the pump or di
minish optimal pump performance. Any
such hazard, damage or diminished per
formance is not covered by the warranty.
NOTE
When appropriate recycling facilities are available,
the user should recycle components and fluids
when doing any routine maintenance / repairs and
also at the end of the pump’s useful life. All other
components and fluids shall be disposed of ac
cording to all applicable codes and regulations.
Air Release Valve Disassembly
Remove the drain plug (11) and drain the float
chamber. Clean and reinstall the drain plug after
draining, using “Loctite 567 PST” or equivalent on
the drain plug threads.
Disconnect the return tubing from the sump valve
(2).
To remove the sump valve, turn the valve clockwise
and pull until it comes out of the base of the float
chamber. Remove the gasket (1).
Disconnect the vent tubing from the air release
valve assembly (14). To remove the air release
valve assembly, disengage the hardware (5 and 6)
and pry the valve assembly off of the float chamber.
Remove the O‐ring (13).
Move the air release valve assembly to a clean
work station before further disassembly.
The only serviceable part of the air release valve as
sembly (14) is the rubber valve seat (not shown). If
the rubber seat requires replacement, remove the
socket head capscrews (17) and separate the cap
assembly (18) from the rest of the air release valve
assembly. Remove the gasket (16).
Use a pair of needle nose pliers to pull the rubber
valve seat out of its metal seat.
To remove the plunger pad (4), tap out the pin (9)
and remove the pad from the float rod (3).
To remove the rod and float (3 and 7), disengage
the hardware (5 and 6) and separate the air release
adaptor (15) from the float chamber (12). Remove
the O‐ring (13).

OM-06823ACCESSORIES
MAINTENANCE & REPAIR PAGE E - 7
Slide the assembled rod and float out of the float
chamber. To remove the float from the rod, remove
one of the cotter pins (8) and slide the float off the
rod.
Air Release Valve Reassembly
Slide the float (7) onto the rod as shown in Figure 3,
and secure with the cotter pins (8). Slide the as
sembled rod and float into the float chamber (12).
Install the O‐ring (13) and secure the air release
adaptor (15) to the float chamber with the hard
ware (5 and 6).
Install the plunger pad (4) on the float rod and se
cure with the pin (9). The ends of the pin must not
protrude beyond the O.D. Of the plunger pad on
either side.
Replace the gasket (1) and install the valve seat (2)
into the float chamber. Connect the return tubing to
the sump valve.

For Warranty Information, Please Visit
www.grpumps.com/warranty
or call:
U.S.: 419-755-1280
Canada: 519-631-2870
International: [phone]
GORMAN‐RUPP PUMPS