commercial building water hammering

[Scott S.]

I am fixing one of 26 sloan valves in the building. It randomly started running so I closed the shutoff as best as possible and put in a new vaccum breaker, diaphram and shut off but now it hammers pretty bad and it did not before. I've fixed other valves where this did not happen. I am by no means a commercial plumber, doing maintenance for the building and do what I can to save money. Any advice or help would be greatly appreciated!

 

[Diehard]

I would start with a call to Sloan to find out if they could suggest the possible cause.

 

[breplum]

Not normal for that to happen.
I would swap out a full drop-in kit (not just the diaphram) of the right spec. (ie gpf and appropriate fixture) I recommend the filter diaphragm upgrade.
Let us know how you fare.