Nordson 25B Reference guide

25B 16:1 Aluminum Pump
Customer Product Manual
Part 1044132-04
Issued 2/19
NORDSON CORPORATION •AMHERST, OHIO •USA
For parts and technical support, call the Industrial Coating
Systems Customer Support Center at [phone] or
contact your local Nordson representative.
This document is subject to change without notice.
Check http://emanuals.nordson.com for the latest version.

Part 1044132-04 E2019 Nordson Corporation
NOTE: This manual covers only the 16:1
Aluminum version of the 25B pump. Other
versions are covered in the following manuals:
2:1 Plated Steel 104330
4:1 Plated Steel 1044131
16:1 Stainless Steel 1044133
27:1 Aluminum 1044134
27:1 Stainless Steel 1044135
Contact Us
Nordson Corporation welcomes requests for information, comments, and
inquiries about its products. General information about Nordson can be
found on the Internet using the following address:
http://www.nordson.com.
Address all correspondence to:
Nordson Corporation
Attn: Customer Service
555 Jackson Street
Amherst, OH 44001
Notice
This is a Nordson Corporation publication which is protected by copyright.
Original copyright date 2004. No part of this document may be
photocopied, reproduced, or translated to another language without the
prior written consent of Nordson Corporation. The information contained
in this publication is subject to change without notice.
Trademarks
Nordson and the Nordson logo are registered trademarks of Nordson
Corporation.
Loctite is a registered trademark of Loctite Corporation.
Nylok is a registered trademark of Nylok Fastener Corporation.

Table of Contents i
Part 1044132-04
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Table of Contents
Quick Reference −25B 16:1 Aluminum Pump A 1-1..............
Introduction A 1-1.............................................
Specifications A 1-1...........................................
Dimensions and Weight A 1-1................................
Operating Sound Levels A 1-1................................
Air and Fluid Specifications A 1-2.............................
Air Requirements A 1-2......................................
Connections A 1-2..........................................
Part Number Quick Reference A 1-3.............................
Pump and Subassemblies A 1-3..............................
Service Kits A 1-3...........................................
Air Motor Service Kits A 1-3................................
Hydraulic Section Service Kits A 1-3........................
Packing Glands and Kits A 1-3................................
Recommended Spare Parts A 1-4.............................
Adhesives, Sealants, and Lubricants A 1-4.....................
Solvent Chamber Fluid A 1-4.................................
Options A 1-5..............................................
Safety B 1-1..................................................
Introduction B 1-1.............................................
Qualified Personnel B 1-1.......................................
Intended Use B 1-1............................................
Regulations and Approvals B 1-1................................
Personal Safety B 1-2..........................................
High-Pressure Fluids B 1-2...................................
Fire Safety B 1-3...............................................
Halogenated Hydrocarbon Solvent Hazards B 1-4...............
Action in the Event of a Malfunction B 1-4.........................
Disposal B 1-4.................................................
Safety Labels B 1-5............................................
Description B 2-1.............................................
Introduction B 2-1..............................................
Pump Versions B 2-1...........................................
Packings B 2-2.............................................
Pump Operation B 2-2..........................................
Suction Stroke B 2-2........................................
Pressure Stroke B 2-2.......................................
Plunger Lubrication B 2-2.....................................
Dead-End and Circulating System Operation B 2-4..............
Options B 2-4.................................................

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Part 1044132-04 E2019 Nordson Corporation
Installation B 3-1..............................................
Mounting and Connections B 3-1................................
Mounting B 3-1.............................................
Grounding B 3-2............................................
Siphon and High Pressure Fluid Connections B 3-3.............
Compressed Air Connection B 3-4............................
Installation Guidelines B 3-4....................................
Operation and Maintenance B 4-1..............................
Introduction B 4-1.............................................
System Check B 4-2...........................................
Solvent Chamber Fill B 4-2.....................................
Flushing B 4-2.................................................
Frequency B 4-2............................................
Cleaning Solution for Flushing B 4-3...........................
System Flushing B 4-3.......................................
Routine Startup B 4-5..........................................
Preparation B 4-5............................................
Startup B 4-5...............................................
Routine Shutdown B 4-6.......................................
Maintenance B 4-7............................................
Daily B 4-7.................................................
Weekly B 4-7...............................................
Every Four to Six Months B 4-8...............................
As Needed B 4-8...........................................
Troubleshooting B 5-1.........................................
Common Problems B 5-2.......................................
Minimizing Pressure Deviations B 5-6............................
Air Supply B 5-6.............................................
Air Exhaust B 5-6............................................
Correcting Siphon Problems B 5-6...............................
Cavitation B 5-6............................................
Priming Problems B 5-7......................................
Preventing Air Valve and Muffler Freezing B 5-7...................
25B Air Valve and Air Motor Repair C 1-1.......................
Introduction C 1-1.............................................
Air Valve Repair C 1-1.........................................
Tools and Materials Required C 1-1...........................
Air Valve Removal C 1-2.....................................
Air Valve Disassembly C 1-2..................................
Snapper Rebuild C 1-4.....................................
Air Valve Assembly C 1-4....................................
Air Valve Installation C 1-5...................................
Air Motor Repair C 1-6.........................................
Tools and Materials Required C 1-6...........................
Preparation C 1-6...........................................
Separating the Air Motor and Hydraulic Section C 1-7............
Air Motor Disassembly C 1-7.................................
Piston Repair C 1-9.........................................
Piston Disassembly C 1-9.................................
Piston Assembly C 1-10.....................................
Air Motor Assembly C 1-10
....................................
Connecting the Air Motor and Hydraulic Section C 1-11............
Returning the Pump to Service C 1-11............................

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25B 16:1 and 27:1 Hydraulic Section Repair C 2-1...............
Introduction C 2-1.............................................
Tools and Materials Required C 2-1..............................
Preparation C 2-2.............................................
Dismounting the Pump C 2-2.................................
Separating the Air Motor and Hydraulic Section C 2-2............
Disassembly C 2-3............................................
Cleaning, Inspection, and Parts Replacement C 2-5................
Ball Check Test C 2-5........................................
Packing Gland Replacement C 2-6............................
Type G Packing Gland Rebuild C 2-6..........................
Assembly C 2-7...............................................
Connecting the Air Motor and Hydraulic Section C 2-9............
Returning the Pump to Service C 2-9..........................
25B Air Motor and Air Valve Parts D 1-1........................
Introduction D 1-1.............................................
Using the Illustrated Parts List D 1-1...........................
Air Motor Parts D 1-2..........................................
Air Valve Parts D 1-4...........................................
Mufflers and Covers D 1-6......................................
Air Motor and Air Valve Service Kits D 1-7........................
Muffler Kit D 1-7............................................
Air Motor Seal Kit D 1-7......................................
Air Valve Seal Kit D 1-7......................................
Air Valve Crankshaft and Arm Kit D 1-8........................
Options D 1-8.................................................
Air Motor Accessory Group D 1-8.............................
Adhesives, Sealants, and Lubricants D 1-9.....................
25B 16:1 Aluminum Hydraulic Section Parts D 2-1...............
Introduction D 2-1.............................................
Using the Illustrated Parts List D 2-1...........................
Type U Hydraulic Section Parts D 2-2............................
Type F Hydraulic Section Parts D 2-4............................
Replacement Packing Glands D 2-6.............................
Packing Gland Materials and Applications D 2-6................
Hydraulic Section Service Kits D 2-6.............................
Pressure Ball and Seat Kit D 2-6..............................
Siphon Ball and Seat Kit D 2-7................................
Ball Check Kit (Pressure and Siphon) D 2-7....................
Hydraulic Service Kits for Type A, D, F, and U Packing Glands ........
D 2-7
Type G Packing Gland Service Kit D 2-8.....................
Options D 2-9.................................................
Wall Mounting Kit D 2-9......................................
Adhesives, Sealants, and Lubricants D 2-10.....................

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Part 1044132-04 E2019 Nordson Corporation

Service Kits and Parts
1044132-QR
©2005 Nordson Corporation
For parts and technical support call [phone].
Refer to 25B Pump Manual 1044132 for complete service and parts information.
Air Valve Kits
B - 106103 Seal Kit
C - 106314 Crankshaft and Arm Kit
B
B
B
B
B
C
C
Type A Type D Type F Type G Type U
Upper Packing Gland (G) 503216
106106 106112 106292
503212
106391 335380
Lower Packing Gland (H)
Hydraulic Service Kit (J)
Hydraulic Section Kits
D - 503132 Pressure Ball and Seat Kit
E - 244826 Siphon Ball and Seat Kit
F - 106107 Pressure and Siphon Kit
G - Upper Packing Glands
H - Lower Packing Glands
J - Hydraulic Service Kits
Glands and Service Kits
Air Motor Kits
A - 106274 Seal Kit
A
A
A
A
A
A
A
323053
Gland
D, F
E, F
H, J
G, J
503396
Plunger
Type G Gland Kit
Included
in Kit
Included
in Kit
(Housings not included in kit)
986707
Retaining Ring
(not included)
986802
Retaining Ring
(not included)
A - Buna-N / Graphite
D - Buna-N / PTFE
F - PTFE / Leather
G - Polyurethane
U - UHMWPE
248831 Type S (solvents)
900255 Type K (solvents)
140029 Type T (waterbornes)
244854 Type Q (waterbornes)
Solvent Chamber Fluids
Packing Types
—
——— —
—— —
25B 16:1 Aluminum Pump

Quick Reference −25B 16:1 Aluminum Pump A 1-1
Part 1044132-04
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Section A 1
Quick Reference −25B 16:1 Aluminum Pump
Introduction
Use this section for quick reference for the following information on the
25B 16:1 Aluminum pump:
Sspecifications
Sservice kits and packing glands
Srecommended spare parts
Sadhesives, sealants and lubricants used for service
Ssolvent fluids
Soptions
Spacking and solvent chamber fluid guide
Refer to the following sections for more information:
Part B: Safety, Description, Installation, Operation, and Troubleshooting
Part C: Air Motor and Hydraulic Section Repair
Part D: Air Motor and Hydraulic Section Parts
Appendix: CE Approvals, Solvent Chamber Fluids, Air Lubricator
Information, Parts Posters
Specifications
Dimensions and Weight
Dimension/Weight 25B 16:1 AL
Height 730.3 mm (28.75 in.)
Width (including mufflers) 290 mm (11.42 in.)
Depth (front to back, in wall mounting bracket) 162 mm (6.40 in.)
Weight 8.6 kg (19 lbs)
Operating Sound Levels
Air Pressure
bar (psi)
Sound Level
dB A (maximum)
Sound Level
dB C (maximum)
7 (100) 68 72
4.1 (60) 66 71

Quick Reference −25B 16:1 Aluminum Pump
A 1-2
Part 1044132-04 E2019 Nordson Corporation
Air and Fluid Specifications
Fluid
to
Air
Ratio
Max. Air
Pressure
bar
(psi)
Max. Fluid
Working
Pressure
bar (psi)
Fluid Flow, liters/min (gpm) Cycles
per
Liter
(Gallon)
Liters
(Gallons)
per
Cycle
at 15
cpm
at 30
cpm
at 60
cpm
16:1 7
(100)
110
(1600)
0.76
(0.20)
1.51
(0.40)
3.03
(0.80)
20
(77)
0.050
(0.013)
Air Requirements
Strokes Per Minute
Air Pressure 20 40 60 80 100
2.7 bar
(40 psi)
0.43 l/sec
(0.91 cfm)
0.88 l/sec
(1.87 cfm)
0.76 l/sec
(2.80 cfm)
1.75 l/sec
(3.70 cfm)
2.22 l/sec
(4.70 cfm)
4.1 bar
(60 psi)
0.71 l/sec
(1.50 cfm)
1.42 l/sec
(3.00 cfm)
2.12 l/sec
(4.50 cfm)
2.83 l/sec
(6.00 cfm)
3.54 l/sec
(7.50 cfm)
5.5 bar
(80 psi)
0.90 l/sec
(1.90 cfm)
1.77 l/sec
(3.75 cfm)
2.64 l/sec
(5.60 cfm)
3.54 l/sec
(7.50 cfm)
4.43 l/sec
(9.40 cfm)
7 bar
(100 psi)
1.06 l/sec
(2.25 cfm)
2.12 l/sec
(4.50 cfm)
3.21 l/sec
(6.80 cfm)
4.25 l/sec
(9.00 cfm)
5.33 l/sec
(11.30 cfm)
Connections
Air inlet: 3/8-in. NPT
Minimum hose I.D.: 10 mm (3/8in.)
Fluid outlet size: 1/4-in. NPT
Fluid hose: high pressure airless hose
5, 6, or 10 mm (3/16, 1/4, or 3/8in.) I.D.
Fluid inlet (siphon) size: 3/4in. NPT
WARNING: Use Nordson or equivalent nylon or PTFE fluid hoses, with
electrical continuity between fittings. Hoses must be capable of
withstanding the maximum output pressure of the pump. Use flexible hoses
between the pump and the fluid system to dampen vibration.

Quick Reference −25B 16:1 Aluminum Pump A 1-3
Part 1044132-04
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Part Number Quick Reference
Pump and Subassemblies
Part Description
245556 16:1 Aluminum 25B Pump, Type U packings
1077622 16:1 Aluminum 25B Pump, Type F packings
245546 SAir Motor
323001 SS Air Valve
245549 SHydraulic Section, Type U packings
1077606 SHydraulic Section, Type F packings
Service Kits
Air Motor Service Kits
Part Description Note
323099 MUFFLER assembly A
106103 SERVICE KIT, seal, air valve A
106314 SERVICE KIT, crankshaft and arm (air valve) A
106274 SERVICE KIT, seal, air motor, 25B A
NOTE A: Refer to Air Motor Parts in Part D1 for a parts breakdown.
Hydraulic Section Service Kits
Part Description Note
106107 SERVICE KIT, ball check, M-25 (pressure and siphon ball checks) A
503132 BALL and seat (pressure) A
244826 SERVICE KIT, ball and seat (siphon) A
NOTE A: Refer to Hydraulic Section Parts in Part D2 for a parts breakdown.
Packing Glands and Kits
Refer to the Pump Packing and Solvent Chamber Fluid Guide included with
this manual for information on selecting the correct packing glands and
solvent chamber fluids for your application. Contact your Nordson
representative for additional information.
Packing Glands for 16:1 Aluminum 25B Pumps
Packing Gland Type A Type D Type F Type G Type U
Upper — — — 503216 (A) —
Lower — — — 503212 (A) —
Kit 106106 (B) 106112 (B) 106292 (B) 106391 (C) 335380 (B)
NOTE A: Complete packing glands with housings and external O-ring.
B: Hydraulic service kits consist of complete upper and lower packing glands and connecting rod O-ring.
C: Type G hydraulic service kit includes parts to rebuild upper and lower packing glands. Does not include
metal housings or internal retaining rings. Refer to Section D2, Hydraulic Section Parts, for more
information.

Quick Reference −25B 16:1 Aluminum Pump
A 1-4
Part 1044132-04 E2019 Nordson Corporation
Recommended Spare Parts
Keep the following parts in inventory to avoid unplanned downtime.
Quantities listed support a single pump. Adjust order quantities based on
the number of pumps in service.
Part Description Quantity Note
106103 SERVICE KIT, seal, air valve 1
106314 SERVICE KIT, crankshaft and arm (air valve) 1
323053 GLAND, air motor 1
323022 STEM, ball 1
106274 SERVICE KIT, seal, air motor, 25B 1
106107 SERVICE KIT, ball check, M-25 (pressure and siphon) 1
503396 PLUNGER, hydraulic, 25B, 16:1 1
- - - - - PACKING glands AR A
NOTE A: Order upper and lower glands or kits, if available. Quantity to stock for one pump depends on coating
material used, pump cycle rate, and operating schedule. Replace both packing glands at the same time if
possible. Refer to Packing Glands and Kits in this section for part numbers.
AR: As Required
Adhesives, Sealants, and Lubricants
Use these adhesives, sealants, and lubricants for maintenance and repairs.
Part Description Quantity
900439 ADHESIVE, threadlocking (Loctite High Temp 271) 1
900481 ADHESIVE, pipe/thread/hydraulic sealant (Loctite High Temp SS567) 1
1612251 LUBRICANT, O-ring, Parker (Parker O-Lube), 2 oz 1
900252 LUBRICANT, molybdenum disulfide, CP-28 (tube) 1
900236 SEALANT, paste, PTFE, 1 pint 1
900214 OIL, Vitalizer, 1 pint (air lubricator) 1
900215 OIL, Vitalizer, 1 quart 1
900216 OIL, Vitalizer, 1 gallon 1
900217 OIL, Vitalizer, 5 gallons 1
Solvent Chamber Fluid
Solvent chamber fluid lubricates the plunger and reduces upper packing
wear. Solvent chamber fluid is not shipped with the pump, since the
pump can be used with either water-based or solvent-based coating
materials. Refer to the Pump Packing and Solvent Chamber Fluid Guide
included with this manual for application information.
Part Description
248831 FLUID, type-S, pump chamber, one quart
900255 FLUID, type-K, pump chamber, one quart
140029 FLUID, type-T, pump chamber, one quart
244854 FLUID, type-Q concentrate (2.3 fluid ounce, makes one gallon)

Quick Reference −25B 16:1 Aluminum Pump A 1-5
Part 1044132-04
E2019 Nordson Corporation
Options
Part Description Notes
1024722 ACCESSORY GROUP, air motor,
3/8-inch
Kit contains filter, regulator, lubricator, air hose, fittings,
brackets and fasteners, and lubricating oil. Refer to Section
D1, Air Motor Parts for the kit parts list.
245552 KIT, wall mount/siphon accessory,
25B, 16: and 27:1, standard
Wall mounting bracket and fasteners; solvent chamber filler
cup; and siphon hose, rod, strainer, and fittings. Refer to
Section D2, Hydraulic Section Parts for the kit parts list.
245551 KIT, bucket mount, 25B, 16:1 and
27:1, standard
5-gallon bucket cover, siphon strainer, solvent chamber filler
cup. Refer to Section D2, Hydraulic Section Parts for the kit
parts list.
245553 KIT, drum mount, 25B, 16:1 and 27:1,
standard
55-gallon drum cover, siphon strainer, solvent chamber filler
cup, fluid filter mount, and fittings. Refer to Section D2,
Hydraulic Section Parts for the kit parts list.
244777 SERVICE KIT, circulating, single Single circulation valve; drain valve, hose, and rod, and
fittings. Installation instructions and parts lists supplied with
kit.
244779 SERVICE KIT, circulating, dual Two circulation valves; two drain valves, hoses, and rods,
and fittings. Installation instructions and parts lists supplied
with kit.
166930 VALVE, check, male to male,
3/8in. NPT, brass, poppet
Install in high-pressure fluid line after pump to prevent pump
motoring. See Note.
338443 VALVE, check, female to female,
3/8in. NPT, brass, poppet
Install in high-pressure fluid line after pump to prevent pump
motoring. See Note.
712013 VALVE, check, female to female,
3/4in. NPT, brass, ball
Install in high-pressure fluid line after pump to prevent pump
motoring. See Note.
Note: Use the ball check valve for slurry applications. Use the poppet check valves for all other fluid applications.

Quick Reference −25B 16:1 Aluminum Pump
A 1-6
Part 1044132-04 E2019 Nordson Corporation

Safety B 1-1
Part 1044132-04
E2019 Nordson Corporation
Section B 1
Safety
Introduction
Read and follow these safety instructions. Task- and equipment-specific
warnings, cautions, and instructions are included in equipment
documentation where appropriate.
Make sure all equipment documentation, including these instructions, is
accessible to persons operating or servicing equipment.
Qualified Personnel
Equipment owners are responsible for making sure that Nordson equipment
is installed, operated, and serviced by qualified personnel. Qualified
personnel are those employees or contractors who are trained to safely
perform their assigned tasks. They are familiar with all relevant safety rules
and regulations and are physically capable of performing their assigned
tasks.
Intended Use
Use of Nordson equipment in ways other than those described in the
documentation supplied with the equipment may result in injury to persons
or damage to property.
Some examples of unintended use of equipment include
Susing incompatible materials
Smaking unauthorized modifications
Sremoving or bypassing safety guards or interlocks
Susing incompatible or damaged parts
Susing unapproved auxiliary equipment
Soperating equipment in excess of maximum ratings
Regulations and Approvals
Make sure all equipment is rated and approved for the environment in which
it is used. Any approvals obtained for Nordson equipment will be voided if
instructions for installation, operation, and service are not followed.

Safety
B 1-2
Part 1044132-04 E2019 Nordson Corporation
Personal Safety
To prevent injury follow these instructions.
SDo not operate or service equipment unless you are qualified.
SDo not operate equipment unless safety guards, doors, or covers are
intact and automatic interlocks are operating properly. Do not bypass or
disarm any safety devices.
SKeep clear of moving equipment. Before adjusting or servicing moving
equipment, shut off the power supply and wait until the equipment
comes to a complete stop. Lock out power and secure the equipment to
prevent unexpected movement.
SRelieve (bleed off) hydraulic and pneumatic pressure before adjusting or
servicing pressurized systems or components. Disconnect, lock out,
and tag switches before servicing electrical equipment.
SWhile operating manual spray guns, make sure you are grounded.
Wear electrically conductive gloves or a grounding strap connected to
the gun handle or other true earth ground. Do not wear or carry metallic
objects such as jewelry or tools.
SIf you receive even a slight electrical shock, shut down all electrical or
electrostatic equipment immediately. Do not restart the equipment until
the problem has been identified and corrected.
SObtain and read Material Safety Data Sheets (MSDS) for all materials
used. Follow the manufacturer’s instructions for safe handling and use
of materials, and use recommended personal protection devices.
SMake sure the spray area is adequately ventilated.
STo prevent injury, be aware of less-obvious dangers in the workplace
that often cannot be completely eliminated, such as hot surfaces, sharp
edges, energized electrical circuits, and moving parts that cannot be
enclosed or otherwise guarded for practical reasons.
High-Pressure Fluids
High-pressure fluids, unless they are safely contained, are extremely
hazardous. Always relieve fluid pressure before adjusting or servicing high
pressure equipment. A jet of high-pressure fluid can cut like a knife and
cause serious bodily injury, amputation, or death. Fluids penetrating the
skin can also cause toxic poisoning.
If you suffer a fluid injection injury, seek medical care immediately. If
possible, provide a copy of the MSDS for the injected fluid to the health care
provider.
The National Spray Equipment Manufacturers Association has created a
wallet card that you should carry when you are operating high-pressure
spray equipment. These cards are supplied with your equipment. The
following is the text of this card:

Safety B 1-3
Part 1044132-04
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WARNING: Any injury caused by high pressure liquid can be serious. If
you are injured or even suspect an injury:
SGo to an emergency room immediately.
STell the doctor that you suspect an injection injury.
SShow him this card
STell him what kind of material you were spraying
MEDICAL ALERT—AIRLESS SPRAY WOUNDS: NOTE TO PHYSICIAN
Injection in the skin is a serious traumatic injury. It is important to treat the
injury surgically as soon as possible. Do not delay treatment to research
toxicity. Toxicity is a concern with some exotic coatings injected directly into
the bloodstream.
Consultation with a plastic surgeon or a reconstructive hand surgeon may
be advisable.
The seriousness of the wound depends on where the injury is on the body,
whether the substance hit something on its way in and deflected causing
more damage, and many other variables including skin microflora residing
in the paint or gun which are blasted into the wound. If the injected paint
contains acrylic latex and titanium dioxide that damage the tissue’s
resistance to infection, bacterial growth will flourish. The treatment that
doctors recommend for an injection injury to the hand includes immediate
decompression of the closed vascular compartments of the hand to release
the underlying tissue distended by the injected paint, judicious wound
debridement, and immediate antibiotic treatment.
Fire Safety
To avoid a fire or explosion, follow these instructions.
SGround all conductive equipment. Use only grounded air and fluid
hoses. Check equipment and workpiece grounding devices regularly.
Resistance to ground must not exceed one megohm.
SShut down all equipment immediately if you notice static sparking or
arcing. Do not restart the equipment until the cause has been identified
and corrected.
SDo not smoke, weld, grind, or use open flames where flammable
materials are being used or stored.
SDo not heat materials to temperatures above those recommended by
the manufacturer. Make sure heat monitoring and limiting devices are
working properly.
SProvide adequate ventilation to prevent dangerous concentrations of
volatile particles or vapors. Refer to local codes or your material MSDS
for guidance.
SDo not disconnect live electrical circuits when working with flammable
materials. Shut off power at a disconnect switch first to prevent
sparking.

Safety
B 1-4
Part 1044132-04 E2019 Nordson Corporation
SKnow where emergency stop buttons, shutoff valves, and fire
extinguishers are located. If a fire starts in a spray booth, immediately
shut off the spray system and exhaust fans.
SShut off electrostatic power and ground the charging system before
adjusting, cleaning, or repairing electrostatic equipment.
SClean, maintain, test, and repair equipment according to the instructions
in your equipment documentation.
SUse only replacement parts that are designed for use with original
equipment. Contact your Nordson representative for parts information
and advice.
Halogenated Hydrocarbon Solvent Hazards
Do not use halogenated hydrocarbon solvents in a pressurized system that
contains aluminum components. Under pressure, these solvents can react
with aluminum and explode, causing injury, death, or property damage.
Halogenated hydrocarbon solvents contain one or more of the following
elements:
Element Symbol Prefix
Fluorine F “Fluoro-”
Chlorine Cl “Chloro-”
Bromine Br “Bromo-”
Iodine I “Iodo-”
Check your material MSDS or contact your material supplier for more
information. If you must use halogenated hydrocarbon solvents, contact
your Nordson representative for information about compatible Nordson
components.
Action in the Event of a Malfunction
If a system or any equipment in a system malfunctions, shut off the system
immediately and perform the following steps:
SDisconnect and lock out system electrical power. Close hydraulic and
pneumatic shutoff valves and relieve pressures.
SIdentify the reason for the malfunction and correct it before restarting the
system.
Disposal
Dispose of equipment and materials used in operation and servicing
according to local codes.

Safety B 1-5
Part 1044132-04
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Safety Labels
Table B 1-1 contains the text of the safety labels on the pump. The safety
labels are provided to help you operate and maintain your pump safely. See
Figure B 1-1 for the location of the safety labels.
NOTE: Item 3 is included with aluminum pumps only.
Table B 1-1 Safety Labels
Item Part Description
1 181119
WARNING
SHIGH PRESSURE DEVICE
Read instruction manual before operation and observe all
warnings.
SINJECTION HAZARD
Airless spray painting equipment can cause serious injury if the
spray penetrates the skin. Do not point the gun at anyone or any
part of the body. In case of penetration, adequate medical aid
must be immediately obtained.
SCOMPONENT RUPTURE
This system is capable of producing ___ bar (____ psi) pressure.
To avoid rupture and injury, do not operate this pump at a
pressure higher than the rated maximum working pressure of any
component in the system (including but not limited to spray guns,
hose, hose connections and heaters).
SFIRE
Static voltage is developed by airless spraying. The pump,
associated system, and object being sprayed must be grounded
to prevent static discharge sparks which could start a fire.
SSERVICING
Before servicing, cleaning, or removal of any part, set trigger lock
on gun, and always shut off power source; then carefully release
pressure in fluid portions of the system.
2 181147 MAXIMUM INPUT 6.9 BAR (100 PSI)
3 246890
(Aluminum
pumps
only
WARNING
Do not use halogenated hydrocarbon solvents in this system, it
contains aluminum parts and may explode. Cleaning agents,
coatings, paints or adhesives may contain halogenated
hydrocarbon solvents. Don’t take chances, consult your material
supplier to be sure.

Safety
B 1-6
Part 1044132-04 E2019 Nordson Corporation
2
1
3
(Aluminum Pumps Only)
Figure B 1-1 Safety Labels
Figure B 1-2 ATEX Label

Description B 2-1
Part 1044132-04
E2019 Nordson Corporation
Section B 2
Description
Introduction
This section provides you with a brief overview of 25B pump versions and
applications, options, and pump operation.
NOTE: The information in this section is common for all versions of the 25B
pump.
Pump Versions
The 25B pump is available in the following versions:
Pump Ratio Wetted Parts Application
2:1 Corrosive-resistant
plated steel
General finishing, low-pressure,
high-volume applications,
including air-atomized coating
systems.
4:1 Corrosive-resistant
plated steel
16:1 Aluminum General finishing,
medium-to-high pressures. Do
not use with halogenated
hydrocarbon solvents.
27:1 Aluminum
16:1 Stainless steel Materials such as halogenated
hydrocarbon and chlorinated
solvents, corrosives,
waterbornes, non-paint
applications, cold glues and
adhesives, medium-to-high
pressures.
27:1 Stainless steel
WARNING: Do not use aluminum pumps with coating materials containing
halogenated hydrocarbon solvents. Under pressure, these solvents can
react with aluminum and cause an explosion. Refer to the Safety section
for more information on halogenated hydrocarbon solvents.