The Fisher 8590 High-Performance Butterfly Valve maintains tight shutoff and can be specified for a wide range of pressure and temperature conditions.
The 8590 valve is available in a lugged body design. A splined shaft can combine with a variety of spring-and-diaphragm or pneumatic piston actuators. A square or keyed shaft can combine with a variety of handlevers, handwheels, or pneumatic piston diaphragm actuators. These combinations help make the 8590 valve a reliable, high-performance butterfly valve for both throttling and on/off applications in the process industries.
The 8590 valve can be supplied with one of several dynamic seals that can be used in a variety of demanding applications. With the appropriate seal selection and materials of construction, the pressure-assisted seal helps provide excellent shutoff against the full ASME class pressure range for the 8590 valve.
Features & Benefits
Shaft Versatility This valve will meet your actuator needs with a choice of splined, square, or keyed shaft connections.
Excellent Shutoff Integrity The pressure-assisted seal design provides tight shutoff and permits the use of smaller., less expensive actuators in applications requiring full ASME B16.34 shutoff capbilities.
Excellent Emissions Capabilities The optional ENVIRO-SEAL packing systems are designed with very smooth shaft surfaces and live-loading to provide improved sealing, guiding, and loading force transmission. The seal of the ENVIRO-SEAL system can control emissions to below 100 ppm (parts per million).
Sour Service Capability Trim and bolting materials are available for applications involving sour liquids and gases. These constructions comply with NACE M0175-2002, MR0175-2003, MR0103, and MR0175 / ISO 15156.
Easy Installation The valve body self-centers on the line flange bolts as a fast, accurate means of centering the valve in the pipeline.
Reliable Flange Gasketing Surface Seal retainer screws are located so there is no interference with the sealing function of either flat sheet or spiral wound line flange gaskets.
True Bidirectional Shutoff Performance A feature of the valve design is that the torque necessary to open and close the valves is the same regardless of the direction in which the differential pressure is applied.
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