Replace Parts of Quick Change Valve Head

For bio-inert modules use bio-inert parts only!

Do not mix with bio / biocompatible parts.

For biocompatible modules use bio / biocompatible parts only!

Do not mix with bio-inert parts.

When

If valve leaks.

Tools required

Qty.		p/n	Description
1			Hexagonal key, 9/64 inch
1			Hexagonal key, 3/32 inch
1			Wrench, 1/4 inch
1			Hexagonal driver SW-6.35 slitted
1			Hexagonal driver SW-4 slitted

Remove capillaries from ports.
Loosen each fixing stator screw two turns at a time. Remove the bolts from the head.
Remove the stator head (and stator face if applicable).
Remove the stator ring.
Remove the rotor seal (and isolation seal if damaged or contaminated).
Install the new isolation seal (if required). Ensure the metal spring inside the ring faces towards the valve body.
Install the new rotor seal.
Replace the stator ring. Ensure the stator ring is flush with the valve body.
Place the new (if required) stator face in place on the stator head. Reinstall the stator head.
Insert the stator screws in the stator head. Tighten the screws alternately two turns at a time until the stator head is secure.
Reconnect the pump capillaries to the valve ports.
CAUTION
Wrong use of the System Pressure Test may damage valve.
- Always select an appropriate pressure limit for the test. Do not exceed the maximum pressure of pressure sensitive components, for example, set the Maximum Pressure to 800 bar, if an 800 bar Quick Change Valve Head is installed.
Perform the System Pressure Test to ensure the valve is leak tight.

Figure: Valve Head Parts (example)

where

1	Stator screws
2	Stator head assembly
3	Stator ring screws (not available)
4	Stator ring (available for service only)
5	Rotor seal
6	Bearing ring
7	Spanner nut (available for service only)

NOTE

Valve Head Parts (example) illustrates replacement parts for the valve heads, with the 6-column selector valve as an example. The valves can vary in their appearance and do not necessarily include all of the illustrated parts. Neither, every spare part is available for each flavor of the valve.

21-Jun-2025