Valvograph Rings To answer the large expansion of the BALL VALVES segment, Carrara S.p.a. has organized its own Valvograph Rings productions according to the most modern demands. Carrara S.p.a. has arranged the dimensions of its own production plants to fulfill flexibility to the necessities of the customers. Thanks to a really impressive quantity of equipment and to a programming of a modern and precise production, Carrara S.p.a. is able to manage any kind of production demand, using great quality materials, regularly checking the conformity of the gaskets produced.