ndi
508 valve vacuum vacuum yotulutsa mpweya ndiyoyenera kukonzedwa pamwamba pa phulusa, posungira phulusa mpweya, kutulutsa mpweya wambiri komanso kusintha kwa chinyezi, kuteteza kusungirako phulusa ku mphamvu yowonjezereka ndi yoipa, ndi chida chofunikira chotetezera kusungirako phulusa.