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Stempaq® LT, Stempaq® HT, & Stempaq® FP series Valve Stem PackingUse of V-rings and chevron style rings in piston seal applications is nothing new. Such sealing solutions have been an industry standard for decades. However, it is our selection of high performance materials that differentiates our valve stem packing from others. FloDynamix Stempaq LT (low temperature) series is developed to operate from -45°F to 400° F where Stempaq HT (high temperature) series provide continuous operation at temperature range of -25°F to 500°F with short term exposures to 575°F. FloDynamix Stempaq FP (fire proof) series is developed to prevent incidental fires by adding graphite reinforced cap to the packing column and conforms to API 607 3rd edition fire test protocols. Stempaq valve stem packing is available in 3-ring and 5-ring assemblies to accommodate various space availabilities. Metal Bellows vs. Valve Stem PackingMetal bellows due to thin membrane structure are subject to corrosion and stress induced cycle fatigue failures. As a result, valve manufactures have sought alternative approach like valve stem packing. PTFE (Teflon®)square-braided and rope packing, PTFE V-rings and graphite rings have been implemented. The problem with all PTFE packing is material creep & movement during temperature fluctuations, resulting in fugitive emissions. The inherent problem with all graphite packing is increased stem friction and a need to continually increase loading force to achieve required emission standards. Stempaq® valve stem packing solves this problem by incorporating a high performance FFKM elastomeric V-ring in the packing structure for HT models and a high performance FKM V-ring for LT models. Our packing offers excellent reduction in fugitive emissions below 1ppm levels with longer term performance.
*Image data courtesy of DuPont Performance Elastomers
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