Offering selection of disk seals, actuator designs, and material combinations, Fisher® 8590 meets plant-wide throttling and on-off requirements. Several dynamic disk seals are available to meet temperature conditions ranging from low-to-moderate up to 1,000°F. Pressure-assisted design provides tight bidirectional shutoff. Utilizing lugged body design across CL600 size range of NPS3–NPS24, valve can incorporate splined shaft that accepts either spring-and-diaphragm or pneumatic piston actuator.