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© 2021 Nordson Corporation
Fluid System Installation
Inlet and Outlet Connections
See Figure 8
. Use pipe thread adhesive/sealant (Nordson part 900431) on all fitting
threads.
1.
Pump Inlet: 7/8−14 JIC (use siphon hose supplied with system)
2.
Outlet to Spray System: 3/4−16 JIC
3.
Return to Fluid Supply: 3/4−16 JIC
4.
Return from Spray System: 1/2−20 JIC
4
2
3
1
Figure 8 Fluid Connections (Top View)
Fluid System Installation Guidelines
•
All tubing and fittings must be stainless steel. Liberally coat fitting threads with pipe
joint adhesive to eliminate air and fluid leaks. Tighten fittings securely.
•
Use flexible hose to connect the spray system and supply to the pump system. The
flexible hose dampens vibrations.
• For both siphon and pressure-feed systems, use the specially designed 1/2 in. ID, 1.5
m (5 ft) siphon hose supplied with the system to connect the coating material supply to
the pump inlet. For 3 gpm engineered systems, 3/4 in. ID hoses are used.
• The capacity of the supply line must be greater than 2 gpm. Restrictions will cause
cavitation, resulting in abnormal wear of the gearbox section in the pump head, and
damage to the diaphragm cartridges. Pressure fluctuations in the spray system are a
sign of pump cavitation.
•
For pressure feed systems, install an inline strainer/filter on the siphon side of the
pump with a 350 micron element. The filter should be as close to the EP2 pump as
possible but with a hose at least 1.5 m (5 ft) long between the filter and the pump.
• For troubleshooting supply line problems, a manifold with vacuum gauge is available.
Connect the manifold to the siphon hose. Refer to Specifications on page 12 for
maximum allowable vacuum pressure in the supply line.
WARNING:
The system pressure relief valve opens if the fluid pressure exceeds the
valve setting to protect the system and the operators from excessive pressure. Do not
bypass this valve. Doing so could result in damage to the pump and possible personal
injury. For lacquer coating systems the valve is typically set to open at 89.6−91.4 bar
(1300−1325 psi). For Cleanspray systems the valve is set to open at 51.7−55.2 bar
(750−800 psi). Refer to
Pressure Relief Valve Adjustment
on page 21.
