Guideline
Trouble shooting guide for PAH, PAHT, PAHT C , PAHT G pumps
67
180R9379 | AQ188686503004en-000801 | PAH 2-12.5 } 07.2022
6.
Typical signs of wear
6.1 Valve plate
Picture 1
A normally worn valve plate has no marks/scratches but only a slightly
polished surface .
No scratches or marks should be felt . The surface must be flat and level .
Picture 2
Scratches
A worn valve plate has scratches, and/or a polished surface . Even small
scratches will give a loss of flow .
Picture 3
A good way to identify a worn valve plate is to hold a straight knife edge
over the valve plate . When holding it up to the light, it will be possible to
see any space between the knife edge and the valve plate . See picture 3 .
If any light can be seen between the two arrows on the picture, the valve
plate is worn .
If any scratches or marks can be felt by running a fingernail over the surface,
the valve plate is worn .
The valve plate on picture 3 is highly damaged .
Содержание PAH 2
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