4-5
Operation and Maintenance
© 2024 Nordson Corporation
1044131-06
Routine Startup
See Figure 4-2
Preparation
Check the levels of the:
• coating material supply (5)
•
• air lubricator (4)
Make sure that the
• siphon rod and strainer (6) are submerged in coating material, or pressure-feed
system is operating
•
•
• compressed air is available to run the pump
• drain rod (12) is in a waste container (13) (circulating systems only)
• pump, coating material supply, and waste container are grounded
Startup
1. Use the following formula to calculate the air pressure required to produce the desired
output pressure:
output pressure --- pump ratio = air pressure required
WARNING: Maximum air pressure for all versions of the 25B pump is 7 bar (100 psi).
Do not exceed this pressure.
Calculate the required air pressure for desired output pressure as shown in the following
examples:
2:1 pump: 100 psi desired --- 2 = 50 psi air pressure
4:1 pump: 200 psi desired --- 4 = 50 psi air pressure
16:1 pump: 1200 psi desired --- 16 = 75 psi air pressure required.
27:1 pump: 2000 psi desired --- 27 = 74 psi air pressure required.
NOTE:
pressure at the spray device will vary, depending on many factors, including material
gauge at the spray device inlet or as close to the inlet as practical.
2.
regulator (3) to the air pressure that will produce the desired output pressure.
3. Purge air from the system:
• Dead-end system: Trigger the spray devices and watch for spitting as air is purged.
Stop when the spray pattern is continuous and even.
• Circulating system: Close the circulation valve (10) and open the drain valve (11).
minute running at the desired number of cycles per minute. Trigger the spray device(s)
to purge air from them.
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