This is indeed the ARI HÖGFÖRS answer for control applications with hot, abrasive fluids such as tar, bitumen or viscous thermal fluids. The contoured plug allows a high degree of control, while the stellite seats give good resistance to abrasion. The valves can be operated with pneumatic or electric actuators including every possible option (positioners, ATEX zone classification, etc.) and integration into the plant distributed control system.

More info here.