After some searching the web I am failing to find any available ball-check valves (described on: https://www.archtoolbox.com/materials-systems/plumbing/plumbingvalvetypes.html) that I can use with my pex plumbing. Currently I have a swing check valve but it makes a loud bang each time my washing machine cycles so a plumber I once talked to told me you could get a vertical check valve that has a ball sitting in a seat they close very quietly. I know I could also get a spring-loaded valve, but liked the idea of the ball-check. Does such a thing exist? Are there any examples you can link me to?
Apparently this is considered off-topic? For those voting it as such, where else can I ask if such things exist? Please provide an alternative. If you want me to word my question differently, here goes: I have a thermal expansion tank because the city has a check valve at the road for my house and after a shower, pressure would build up in my pipes in excess of 90psi after expansion. So I installed an expansion tank, solved that problem. New problem is that after a shower and the expansion tank absorbs the pressure, if I turn on a cold valve in the house the expansion tank first pushes out some hot water before city water enters the pipes and you would get a short blast of hot water. I solved this by using a swing check valve separating my hot and cold lines in the house so that the expansion tank can never push hot water back to the cold. Problem is that the swing valve is noisy, especially when the inlet valve on the washing machine closes and sends a pressure wave back through the cold side that pushes up the swing valve and quickly closes it, causing a bang (not from water hammer mind you, but from the brass flap closing). I would like to try a different valve that would be quieter and I would like to avoid a spring valve because that would induce a slight amount of back pressure to my hot water lines and I think a ball-check valve could be a quiet, effective solution. Does anyone have experience that agrees with this or a better alternative? I'm not opposed to examples of products.