Parker Low-Torque™ Grafoil® Bonnet and Packing Design

Grafoil® Stem Seal Torque Reduced 50%

PGI answered customer requests for a lower stem handleturning 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.



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