Fisher 8560 High Performance Butterfly Valve

Overview

The Fisher 8560 High Performance Butterfly Valve is a rotary control valve engineered by Emerson for throttling and on/off duty in process lines that demand very low leakage and dependable long-term shutoff. Its eccentrically-mounted disc geometry lifts the sealing surface cleanly out of the flow path as it opens, which sharply reduces seat wear compared with a concentric disc design and gives the valve an approximately linear flow characteristic that plant engineers can tune predictably across the full 90-degree rotation. Sized from NPS 3 through NPS 12 with lugged-style end connections, the 8560 fits directly into the compact, weight-conscious piping runs typical of retrofit and skid-mounted control applications.

Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation. Facilities in Muscat, Sohar, and across the region rely on this trusted supply channel to receive valves built to the exact NACE MR0175-2002 sour-service and ASME B16.34 pressure-temperature standards their process safety cases require.

Operating Principle

The Fisher 8560 uses a high-performance eccentric disc arrangement in which the shaft centerline is offset from both the pipe centerline and the seat plane. As the disc rotates away from the closed position, this triple offset draws it away from the seat immediately rather than dragging it across the seating surface, which is the mechanism that gives eccentric butterfly valves their characteristic low friction, low actuation torque, and extended seat life relative to a standard centric-disc butterfly valve. Two seal options are available to match service severity: the NOVEX metal seal delivers Class IV unidirectional shutoff and tolerates temperatures from -46 to 538°C, while the Phoenix III seal achieves bidirectional Class VI shutoff per ANSI/FCI 70-2 and IEC 60534-4 across a -46 to 232°C range.

Because the disc clears the seat through rotation rather than sliding contact, the 8560 sustains tight shutoff over many operating cycles with minimal maintenance intervention, and the standard conductive packing provides electrical bonding for safe operation in classified hazardous areas. The practical result for plant operators is a control valve that combines the compact envelope and light actuator sizing of a rotary valve with sliding-stem-grade shutoff performance, all while avoiding the pressure drop penalty and higher torque demand associated with older butterfly valve generations.

Engineering Design of the Fisher 8560

The Fisher 8560 body is offered in cast carbon steel or CF8M stainless steel, mated to a CF8M stainless steel disc carrying a stainless steel seal ring, giving the valve broad chemical compatibility and the mechanical strength needed for demanding hydrocarbon and utility services. The lugged body style allows the valve to be installed as an end-of-line dead-end service valve or bolted between flanges without through-bolting the entire joint, simplifying maintenance because the downstream piping can be removed while the valve stays in place on the upstream flange.

An optional ENVIRO-SEAL packing system upgrades the standard stem seal to meet the EPA’s 100 ppm fugitive-emission limit, an increasingly common specification on process units across Oman’s refining and petrochemical sector. The packing box, shaft bearings, and seal ring are all individually replaceable components, so a maintenance team can refresh the valve’s sealing performance without removing the body from the line. The valve accepts standard Fisher rotary actuators and FIELDVUE digital valve controllers through a common mounting interface, allowing operators to pair the 8560 with pneumatic or electro-pneumatic control packages already standardized across their plant.

Key Features

The Fisher 8560 delivers a combination of throttling accuracy, sealing integrity, and service flexibility that makes it a preferred rotary valve for demanding GCC process applications.

• The Fisher 8560’s eccentrically-mounted disc produces an approximately linear flow characteristic suitable for precise throttling as well as tight on/off control.
• NOVEX and Phoenix III seal options allow the same valve platform to be configured for either unidirectional Class IV or bidirectional Class VI shutoff.
• Body and trim materials are available in carbon steel or CF8M stainless steel to match a wide range of process fluids and corrosion conditions.
• Sour-service trim and bolting options comply with NACE MR0175-2002 recommendations for hydrogen sulfide environments common in Gulf oil and gas production.
• The optional ENVIRO-SEAL packing system reduces valve stem emissions to below the EPA 100 ppm limit for fugitive emissions compliance.
• Standard conductive packing provides electrical bonding, supporting safe installation in hazardous area classifications.
• Pressure ratings consistent with ASME B16.34 Class 150 and Class 300 cover the majority of mid-pressure industrial piping systems.
• Individual component replacement of the seal ring, packing, and bearings allows in-line maintenance without full valve removal.

Industrial Applications

The Fisher 8560 High Performance Butterfly Valve is widely specified for throttling and isolation duty in oil and gas processing, petrochemical manufacturing, power generation, and water treatment facilities where a compact, low-torque rotary valve is preferred over a heavier sliding-stem globe valve. Its NPS 3 to 12 size range and lugged-end configuration make it a natural fit for utility headers, cooling water systems, and general process services where reliable Class IV or Class VI shutoff is required without the space and weight penalty of larger control valve bodies.

With engineering support in Muscat, Seven Star LLC supplies the 8560 to industrial buyers across Oman and the GCC, supporting projects in the Sohar and Salalah economic zones as well as upstream and downstream facilities throughout Muscat and the broader Sultanate.

Technical Specifications

The table below summarizes the primary Fisher 8560 specifications relevant to sizing and material selection.

Request a Quote for Fisher 8560 High Performance Butterfly Valve

Seven Star LLC invites process plant engineers and procurement teams across Oman and the GCC to submit a formal RFQ for the Fisher 8560 High Performance Butterfly Valve. Seven Star LLC supplies on request with lead time confirmed at quotation, provides full technical datasheets on request, and connects buyers directly with our instrumentation division for sizing, trim selection, and sour-service configuration support. Contact Seven Star LLC today to request a quotation for Fisher 8560 valves with local engineering support.

Browse the full Fisher range or see more Control Valves products supplied by Seven Star LLC in Oman and the GCC.

See also: Fisher easy-e EZ Control Valve.