Welch 2019C-02 Operation Manual page 15

To prevent damage to the pump, never apply any sealant or lubrication to the gasket.
Valve plate replacement:
Wipe inside of head clean. Install
new gasket if needed, be sure to
remove any excess gasket.
Replace valve plate in head.
Chamfer side of valve plate should
face you. Insert four new screws.
Screw the four screws crosswise
with a torque of 3 - 4 Nm.
Reassembling the pump:
Place the head (with handle) on
the pump casing, observing the
position of the air intake port (B)
and exhaust port (A).
Note: Make sure the diaphragm
is seated properly in the well of
the pump casing and head. Do
not pinch the diaphragm or liner.
Insert the screws on the head
(with handle).
Do not completely tighten the
screws yet.
Now screw the four screws
crosswise with a torque of
5 - 6 Nm.
2019
Maintenance and Servicing
WARNING !
15