Try either to generalize or specify your question, and you will have better chances getting advice:
a) Generalize: What is the best possible solution for following application..... etc. (type of valves)
or
b) We have following problems with..... (specify).
If you just want references on the valves for your application : ask the supplier to give for instance five references, and ask the largest competitor/supplier for the same.
References without specifying the application and requirements (for instance required expected life-time and and what service/sparepart and overhaul-cycle with expected total lifetime cost) would not give you very valuable information.