ARO 637309-VV Viton Service Kit for PD20 Diaphragm Pumps
Viton diaphragm plus Viton balls in one service kit for ARO PD20A and PD20S pumps ending in SVV-B
Viton diaphragm and Viton balls for rebuilding ARO PD20 double diaphragm pumps, including PD20A-BAP-SVV-B and PD20S-FSS-SVV-B.
For ARO PD20 pumps built with Viton elastomers, the 637309-VV kit supplies a Viton diaphragm and Viton balls. Its fits list covers PD20A and PD20S models whose codes finish in SVV-B.
In a double diaphragm pump, the diaphragm separates the air side from the fluid side. The balls act as one-way check valves at the inlet and outlet. Changing both at one service visit keeps wear even across the fluid section.
Stay with the VV kit when the pump model calls for Viton rather than mixing elastomers between sides. Keep the pump service manual at hand during the rebuild so parts go back in the right order.
Rebuild Triggers
- Fluid or vapor escapes through the air exhaust.
- Suction lift weakens and the pump loses prime.
- Strokes speed up but delivery falls, a hint that the balls are not sealing.
PD20 Pumps That Use This Kit
Three pumps carry this kit in our parts data. Verify your model code on the nameplate first.
| Brand | ARO |
|---|---|
| Product Type | Kit |
| Material - Diaphragm | Viton |
| Material - Balls | Viton |
