13.1 Cleaning valves
Possible faulty operation
Refer to the exploded drawings in the appendix
when working on the unit.
Possible faulty operation
n
Discharge and suction valves differ from each other. Only dis‐
mantle them one after the other, so that you do not confuse the
components.
n
Only use new components which fit your valve, both in terms of
shape and chemical resistance.
n
Recalibrate the pump after replacing a valve.
n
Using an Allen key or similar, insert it into the smaller hole of
the pressure connector and push the valve inserts out of it.
A suction valve is constructed in almost the same way as a dis‐
charge valve.
Please note, however, that:
n
The two valve inserts are identical here.
n
There is an additional spacer below the valve inserts.
n
There is a shaped seal in the dosing head instead of an O-ring.
n
The flow direction of the suction connector is the opposite to
that of the pressure connector.
Possible faulty operation
n
Discharge and suction valves differ from each other. Only dis‐
mantle them one after the other, so that you do not confuse the
components.
n
Only use new components which fit your valve (in terms of
shape and chemical resistance).
n
With the PVT material version, the ball seat is integrated in the
dosing head and so has to be cleaned separately.
n
With the PVT material version, the discharge valve is a double
ball valve.
n
Using an Allen key or similar, insert it into the smaller hole of
the pressure connector and push the valve inserts out of it.
A suction valve is constructed in almost the same way as a dis‐
charge valve.
Please note, however, that:
n
The flow direction of the suction connector is the opposite to
that of the pressure connector.
Cleaning a discharge valve or a suc‐
tion valve for types (PP, PV, NP)
1000, 1601, 1602, 1604, 2504
Cleaning a discharge valve or a suc‐
tion valve for types (PP, PV, NP)
0708, 1008, 0220, 0420, 0413, 0713,
0232
Repair
47
