2-1
Description
© 2024 Nordson Corporation
1044131-06
Section 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.
Problem Possible Cause Corrective Action
2:1 Corrosive-resistant plated steel
air-atomized coating systems.
4:1 Corrosive-resistant plated steel
16:1 Aluminum
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.
Packings
Pumps are sold with Type-U (Ultra-high molecular weight polyethylene or UHMWPE)
or Type-F (PTFE/leather) packings. Optional packings are available for use with other
coating materials and solvents. Refer to the Pump Packing and Solvent Chamber Fluid
Guide included with this manual for application information, the 25B 4:1 Plated Steel
Pump Quick Reference Guide and 25B 4:1 Plated Steel Hydraulic Section Parts for
Pump Operation
Suction Stroke
See Figure 2-1. The main components of the pump are the air valve (1), air motor (2),
and hydraulic section (3).
Supply air enters the pump through the air valve. The air valve directs air through the
connecting tube (6) to the underside of the piston (5), forcing the piston up. Air above the
it.
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