Nordson EP2, Руководство пользователя

Страница: 25 / 40

21 EP2 Pump System
© 2021 Nordson Corporation
1072608-04
Pressure Relief Valve Adjustment
WARNING: System pressurized! Use extreme care when making adjustments. The
system pressure relief valve opens if the fluid pressure exceeds the valve setting to
protect the system and the operators from excessive pressure. If the relief valve fails to
operate correctly, replace it immediately. Do not operate the system without a correctly
functioning relief valve.
Pressure relief valve opening pressure (factory setting)
• lacquer coating systems: 89−91.4 bar (1300−1325 psi)
• CleanSpray systems: 51.7−55.2 bar (750−800 psi).
Use this procedure to adjust the valve opening pressure and check the valve operation.
1. Adjust the back pressure regulator until the system fluid pressure is at the factory
setting given above.
2. See Figure 10. Cut and remove the lock wire (2).
3. Loosen the locknut (3).
4. Rotate the adjustment cap (1) until the relief valve opens. Fluid will be routed to the
waste container.
5. Tighten the locknut (3) against the adjustment cap (1).
6. Adjust the back pressure regulator until the relief valve opens. Do not exceed 93 bar
(1350 psi ).
• If the relief valve does not open, repeat steps 1 through 5.
• If the relief valve opens, secure the adjustment cap (1) with lock wire.
7. Adjust the back pressure regulator to reduce the system pressure.
8. Test the relief valve by increasing the system pressure with the back pressure
regulator to the valve opening pressure so the valve opens, then decreasing the
pressure. Repeat this three times. If the relief valve fails to open at the pressure
setting, replace it.
9. Install a new lock wire (2).
2
1
3
Figure 10 Pressure Relief Valve Adjustment
1. Adjustment cap 2. Lock wire 3. Locknut