The MFA(B)OY turbine/piston-type orbit ball valve is used for isolating, regulating and diverting pipeline fluids. It employs a cast or forged body with an orbital ball/plug mechanism and can be fitted with pneumatic piston, electric or worm-gear actuation. Elastic or metal seats are available, and the ball/plug is nitrided or quenched/hardened to provide stable sealing according to service requirements.