CVU and CVH Packing | John Crane Packing
This website uses cookies to ensure users have the best online experience. By continuing to browse this website, you are giving your consent to the use of cookies. To learn more, read our privacy policy. X


< Back to 盘根


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.

View complete list of product documents in all languages >


  • 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.


Temperature Limits

-120°F to 450°F/-85°C to 232°C

Pressure Limits

CVU: 150 psi(g)/10 bar(g)

CVH: 1000 psi(g)/68 bar(g)

pH Range

0 to 14

Recommended Applications

  • 流程泵
  • 反应釜与搅拌器
  • 其他转动设备
  • Valves

Contact Us