But­ter­fly valve com­bines cost sav­ings with high per­for­mance

DEMM Engineering & Manufacturing - - PRODUCT WATCH -

Emer­son Process Man­age­ment in­tro­duces the Fisher 8590 high-per­for­mance but­ter­fly valve that brings a se­lec­tion of disk seals, ac­tu­a­tor de­signs and ma­te­rial com­bi­na­tions to meet­ing plant-wide throt­tling and on-off re­quire­ments.

Util­is­ing a lugged body de­sign across the CL600 size range of NPS3 – NPS24, the 8590 can in­cor­po­rate a splined shaft that ac­cepts ei­ther a spring-and-di­aphragm or pneu­matic pis­ton ac­tu­a­tor. It is also avail­able with ei­ther a square or keyed shaft that com­bines with han­dlevers, hand­wheels or pneu­matic pis­ton ac­tu­a­tors.

The pres­sure-as­sisted de­sign of the 8590 disk seals pro­vides tight shut­off and per­mits the use of smaller, less ex­pen­sive ac­tu­a­tors in meet­ing full ASME B16.34 shut-off ca­pa­bil­i­ties.

The 8590 of­fers true bidi­rec­tional shut­off, which means that 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 En­vi­roSeal pack­ing sys­tem com­bines with the valve’s mi­cro-smooth shaft sur­face to keep emis­sions be­low 100 parts per mil­lion (PPM). Yet an­other ex­treme 8590 ca­pa­bil­ity in­volves sour liq­uids and gases, with trim and bolt­ing ma­te­ri­als avail­able to com­ply with NACE MR0175-2002, NACE MR0175-2002-2003, MR0103, and MR0175/ISO 15156.

www.demm.co.nz/reader-en­quiryquiry #150606.

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