Valve-Stem Packings

VALUE-STEM PACKINGS

Also known as stem packing or bonnet packing, valve-stem material is constructed from a high-quality carbon fiber core and a PTFE shell. The result is a pliable, self-lubricating and durable material. The construction reduces friction in applications where air operated valves are used for steam, water, air and process control applications.

Valve-stem packing is designed to conform to any surface. It’s an essential component for watertight mechanical seals.  Valve-stem packing is affordable, versatile, dependable and easy to install. It can be loaded with other materials such as glass fiber, silica or carbon to fit specific applications.

 

TYPES OF VALUE-STEM PACKINGS

Denver Rubber Company offers two types of valve-stem packings, Style 5882 and Style 1303-FEP.

Style 5882

PROPERTIES

  • Prevents liquid leaks
  • Reliable
  • Up to 20% lower friction than competing products
  • Consistent service temperature of -150 to 450°F

PHYSICAL PROPERTIES

  • Construction: PTFE fiber over braided carbon core
  • pH Range: 0-14
  • Pressure: to 3,500 psi / 242 bar in valves

THERMAL PROPERTIES

Min. Temperature: -200°F / -130°C
Max. Temperature: 550°F / 288°C

APPLICATIONS

  • Watertight mechanical systems
  • Air operated valves (AOV)
  • Plumbing
  • Process control
  • Boat motor systems
  • Water and chemical systems

 

Style 1303-FEP 

PROPERTIES

  • Resists heat, pressure and chemicals
  • Compliant with stringent VOC and VHAP emissions regulations
  • Easy to use
  • Reliable and safe

PHYSICAL PROPERTIES

Max. Valve Pressure: 4,500 psi / 310.3 bar

THERMAL PROPERTIES

Min. Temperature: -328°F / -200°C
Max. Temperature:  850°F / 455°C (1,200°F / 650°C Steam)

 

APPLICATIONS

  • Hydrocarbon
  • Chemical processing
  • Power generation

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