Emerson Fisher 8590 butterfly valve
Emerson Process Management’s Fisher 8590 high-performance butterfly valve brings together a selection of disk seals, actuator designs and material combinations to meet plant-wide throttling and on-off requirements. The product gives application engineers the ability to combine a single valve platform with a selection of technologies to control a diverse range of CL600 process demands.
Several dynamic disk seals are available to meet temperature conditions that range from low to moderate up to 538°C. Severe service and cryogenic applications can be met with the appropriate metal-polymeric or rugged stainless steel seal construction.
Utilising a lugged body design across the CL600 size range of NPS3-NPS24, the product can incorporate a splined shaft that accepts either a spring-and-diaphragm or pneumatic piston actuator. It is available with either a square or keyed shaft that combines with handlevers, handwheels or pneumatic piston actuators.
The pressure-assisted design of the disk seals provides tight shutoff and permits the use of smaller actuators in meeting full ASME B16.34 shutoff capabilities. The torque necessary to open and close the valve remains constant regardless of the differential pressure across the disk. Slam-shut conditions are not created as the disk nears its seat, which extends seal life and avoids actuator and piping damage.
Besides shutoff given by the choice of elastomer and metal disk seals, the optional ENVIRO-SEAL packing system combines with the valve’s micro-smooth shaft surface to keep emissions below 100 ppm. For use with sour liquids and gases, trim and bolting materials are available to comply with NACE MR0175-2002, NACE MR0175-2002-2003, MR0103, and MR0175/ISO 15156.
With a CL600 rating per ASME B16.34, the valve’s face-to-face dimensions meet EN558, API609, MSS-SP68 and ASME B16.10 standards. The valve body self-centres on the line flange bolts as a fast, accurate means of centring the valve in the pipeline.
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