CVU and CVH Packing | John Crane Packing


Automatic PTFE Packing Rings

John Crane CVU and CVH sets cover a wide range of fluids, including acids, caustics and solvents at high temperatures and pressures. These automatic packings have superior sealing abilities, making them ideal for critical service applications.

They require little or no gland adjustment and generate very low friction, heat and wear, thus extending valve stem life and reducing repair or replacement costs. Made from high-purity PTFE, CVU and CVH sets contain no lubricants or dispersions, making them well suited for non-contaminating services.



  • California Residents: PROPOSITION 65 WARNING
  • CVU and CVH — Available in virgin, carbon, or glass-filled PTFE, and are molded or machined to customer requirements. Sets consist of a male and female end adapter for stuffing box conformity and middle rings that provide positive sealing for valve stems.
  • Applications — Sets are applied in control valves, hydraulic cylinders, ball valves, and instrumentation valves where water, acids, caustics, solvents, oils, gases, and high purity washes and rinses are used.
  • Standard sizes — Standard sizes range from 1/8" x 3/8" to 3" x 3-3/4". Additional sizes and metric sizes are available upon request.

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