Parker Low-Torque Grafoil Bonnet

Grafoil? Stem Seal Torque Reduced 50%
PGI answered customer requests for a lower stem handle turning torque by introducing their new Low-Torque? Grafoil? bonnet and packing design. It is the nature of Grafoil? packing that it is easily abraded away by the rotation of the valve stem. This abrading requires periodic packing compression adjustment to stop stem seal leaks. Parker developed a proprietary assembly technique to lower stem torque by 50% which increases ease of operations, and therefore reduces stem abrasion and stem damage from over-torquing. The Low-Torque? Grafoil? packed stem seal reduces packing adjustments and the associated maintenance costs while extending the service life of the Grafoil? packing.
Download Parker Low-Torque? Grafoil? Bonnet and Packing Design Flyer
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