Check valve and a Butterfuly valve combo

[kah1873]

I am looking for a manufacture/supplier of Check and a butterfly valve combination valve. Also the supplier of back flow preventor valve.

 

[stanier]

You may be thinking of an Adams pump start valve?

By back flow preventer do you mean reduced pressure zone device for preventing contamination of a water supply ?

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au

 

[kah1873]

Thanks, I was able to secure information on back flow preventor valve.

 

[gustorf]

I have just seen once a check/butterfly combination valve built by Mokveld.
This combination has the bad disadvantage, that you can not replace the check valve without draining and depressurizing the system.
You also have a very special item in your system instead of two "standard" itmes.
Try to contact a check valve manufacturer like Noreva and see if they can offer a butterfly together with their check valve as a package.