Expanded graphited filaments for pump & valve packings

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 192 KB
• Volume: 1994
• Category: Article
• ISSN: 1350-4789
• DOI: 10.1016/1350-4789(94)90182-1

✦ Synopsis

produces an efficient effect of dynamic pressure during rotation, which maintain optimum clearance between the seal faces in order to minimize the leakage.

Thanks to the dual-directionality this seal makes the installation arrangement work more economical for a wide range of applications. Furthermore, the seal performance is enhanced as it can be reverse-turned during stoppage of the equipment• For rotary equipment, such as blowers, turbines and compressors, used to process gaseous fluid, different designs of mechanical seals have been employed in both contacting and non-contacting versions. However, according to Nippon Pillar, none of these designs have completely satisfactory solutions.

Double mechanical seals have excellent seal performance but are costly because of auxiUary devices needed for a sealing liquid. Circumferential seals are suitable primarily for low pressure and low speed applications and labyrinth seals are used in high pressure and high speed applications, but are said to have a comparatively high leakage rate.

The Pillar dry gas seal has been developed to give a good solution to such problems, offering good seal performance under hard operating conditions and durability as well as economy. The main features of the seal include: • Minimized leakage: 0.01 to 0.001 or less, compared with the labyrinth seal. • Stable performance: pressure-resistance and high speed characteristics. • Less power consumption: minimized torque and power consumption thanks to the non-contacting seal faces. • Durability: long service life because of minimized wear