Bühler technologies P1.1, Installation And Operation Instructions Manual, Page: 18 / 37

P1.1, P1.1E
6.1 Replacing the inlet and outlet valves
First detach the screw connections.
Unscrew the inlet or outlet valve with a wide slot screwdriver.
Attention: The PVDF and PVDF with bypass valve pump bodies already have PTFE gaskets installed in the gas inlets and outlets.
These are also included in the valve spare parts kit. Remove the old gaskets before installing the new ones.
The inlet and outlet valves are identical. Their installation position determines the function. As shown in the image, the valves
are blue on one side and black on the other. The valves are further marked “IN” or for inlet and “OUT” for outlet.
Inlet valve
Outlet valve
To assemble the sample gas pump, perform the steps in reverse order. When tightening the inlet and outlet valves be sure to ob-
serve the required tightening torque of max. 1 Nm.
CAUTION! Tightening the valves more will permanently deform the pump
body, requiring replacement.
When installing the screw connection, ensure the connection is tight.
6.2 Replacing the O-ring on the bypass valve (optional)
– Loosen the two screws on the valve plate and carefully remove the entire unit.
– Coat the new O-ring with suitable O-ring grease (e.g. Fluoronox S90/2) and install in the spindle.
– Carefully insert the entire unit into the pump body while turning and tighten screws.
16 Bühler Technologies GmbH BE420020 ◦ 03/2020