This Palmetto style VA1389 expanded PTFE and graphite compression packing seal with a flexible graphite core protects pumps and valves from fluid leaks in general service applications. The interwoven braided packing seal is made of expanded polytetrafluoroethylene (ePTFE) and graphite yarns interwoven on the surface. ePTFE is a strong, flexible material that exhibits the same characteristics as polytetrafluoroethylene (PTFE), such as low friction and resistance to harsh chemicals, but has a more porous, conformable structure that accepts lubricant better and helps reduce leak-off in applications with irregular surfaces and gaps. Graphite yarn enhances the packing€s low friction properties, resists high temperatures, and transfers heat away from the shaft to prevent glazing and scoring, reducing leakage and extending the packing and sleeve life. The ePTFE and graphite yarns are braided over a core of flexible graphite heat conductive (HDY) fibers that extend service life by preventing over-heating of the shaft and other critical equipment.

This packing seal is compatible with media in the pH range of 0-14, except strong oxidizers in the 0€“2 pH range, such as oleum, fluorine, and fuming nitric acid. It has a shaft speed of 4,500 feet per minute (fpm), a pressure limit of 1,500 pounds per square inch (psi), and a pressure resistance rating of 2,500 psi in valves and 300 psi in pumps. It operates across a wide temperature range from -400 to 600 degrees F (-240 to 340 degrees C). Style VA1389 is suitable for use in general service applications such as dredge and sewer treatment, mining, and paper mills, among others.

Specifications

Rope seals provide a pressure seal to help retain fluids and gases in a wide variety of commercial and industrial applications. They have a round, square, or rectangular cross section, and come in various braided designs including braid-over-braid, braid-over-core, laminated, twisted, or interwoven. Rope seals can be manufactured from a single material or a combination of materials that suit specific pressure, temperature, speed, and chemical applications. Some rope seals are impregnated with lubricant and have reinforced cores for improved performance in specific environments, such as extremely high temperatures. They can be used to create a static seal in fixed or slow-moving applications like expansion joints, doors, and valves, or a dynamic seal in equipment with reciprocating, rotating, or oscillating movement like centrifugal pumps, rotating stems, and blowers. Rope seals come in uncut lengths on spools or as precut molded rings. They are used in numerous industries including agriculture, oil and gas, automotive, aerospace, construction, and consumer goods.

Palmetto Inc. manufactures packing products for pumps and valves, such as compression packing seals, packing tools, gasket sheets, and fillers. The company, founded in 1872, is headquartered in Denton, MD.