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This option provides premier valve stem sealing characteristics for adverse conditions of extreme pressure/ temperture variations. Designed to meet the most stringent fugitive emission regulations,design is comprised of an extra deep stuffing box/packing/stem seal retainer & conical disc spring. The disc spring provide contiuous compression of the packing assembly and compensate for wear.

All top flanged end products shall have an integrally cast(ISO)actuator mounting pad. This feature provides for direct mount of gear operators or electric actuators. The additional cast for separate mounting bracket is eliminated.

The stem seal retainer, with its(2) static viton o-ring seals; Accepts the forces provided by the combination iso mounting pad/packing gland & transmits those forces as packing/disc spring factory pre-load. A variety of o-ring seals are available for those exceptionally demanding applications. Field maintenance & costly repairs are virtually eliminated.

Optional conical disc springs insure adequate loading of packing at all times. Excessive stem torque and packing deformation due to over-tightening of conventional packing glands is eliminated. The constant "LOAD" provided by the disc springs compensates for normal wear-repair and maintenance costs are virtually eliminated.

The high pressure/high temperature packing set is comprised of self-cleaning, die-formed, high-density and low-density graphite molded packing materials. This unique design eliminates stem galling, lowers required valve stem torque and increases product performance.http://www.didlink-valve.com

TRUNNION LOW STEM DESIGN