When

  • Issue with the check valve that could not be solved by cleaning (for example, persistent leakage)

  • Damage of outlet check valve

Parts required

Outlet check valve

Tools and additional items required

  • Solvent suitable for purging to flush out harmful substances

  • Solvent suitable for your application

Parts affected on the pump head

312
Figure: Outlet check valve on pump head

No.

Description

1

Pump head

2

Outlet check valve

3

U-tube

Preparations

  1. To flush out harmful substances, purge the pump with an appropriate solvent.

Follow these steps

  1. On the pump head, remove the U-tube.

  2. Loosen and remove the outlet check valve with your fingers.

  3. Insert and tighten the new outlet check valve with your fingers.

  4. On the pump head, connect the U-tube.

  5. Purge the pump using the solvent for your application.

  6. Inspect the check valve and connections for indications of leakage. Tighten leaky connections only when the system pressure is down to zero.

  7. Test the pump for leakage. Run the script: E04 - Detailed Leak test (Pump).