Buchi V-600 - Replacing the Non-Return Valve

7 | Cleaning and servicing BÜCHI Labortechnik AG
48/65 Operation Manual Vacuum Pump V-600
7.2.4 Replacing the non-return valve
On each of the four pump heads of the V-600 there are two non-return valves with O-
rings (see Chapter7.2.6 "Replacing O-rings", page53). They are inside the elbow
connectors. To get at the valves, the connecting components and elbow connectors
first have to be removed from the pump heads.
2
1
2
1
Fig.29: Non-return valves in V-600
1 O-rings 2 Non-return valves
u Remove the casing front, see Chapter7.2.2 "Dismantling and reassembling pump
head", page43.
u Remove the elbow connectors together with connecting components, see Chapter
"Step 1: Removing connecting components", page44.
u Remove the old non-return valves (2) and O-rings (1) from the elbow connectors.
Use the diaphragm grips to do so., Chapter7.2.7 "Removing non-return valve from
elbow connector", page54.
u Insert new non-return valves and O-rings in the elbow connectors. NO-
TICE!When inserting the valves, pay attention to the symbols on the pump
heads! The two valves on each pump head are inserted the opposite way
round from each other.