Description Rubber Valve seats are used in Butterfly valves for sealing purpose. The material of the seat can be made from many different elastomers or polymers. The seat may be bonded to the body or it may be pressed or locked in. Application & Usage The seat of a resilient-seat butterfly valve utilizes an interference fit between the disk edge and the seat to provide shutoff. Materials used EPDM Rubber, Silicone Rubber & Viton Rubber