Does It Matter Which ASV?

[TripleT]

Hi, just wondering which style of automatic shut off valve is more dependable.

The straight through, or U-type Payne.

Currently I am using the straight through, and have noticed that it hammers when I use the by-pass valve to flush the membrane. It does not hammer when the flow restrictor is in use.

I am planning on swapping them around to see if it's the through valve that is faulty.

Thanks,
T