For applications with special seal performance and reliability requirements, Parker has developed a PTFE chevron packing set. It is manufactured from PTFE-based compounds and other high-performance polymers using proven FlexiSeal® technology.
A typical PTFE chevron packing set consists of a radial FlexiSeal® followed by several V-rings and a pressure ring.
The FlexiSeal® is the primary sealing element. When pressurized, it activates the subsequent V-shaped chevron seals, pushing the sealing lips outward. The numerous sealing edges generated this way reduce the risk of leakage.
The pressure ring ensures that the softer PTFE elements are not pushed into the downstream system gap (gap extrusion).
The chevron packing sets are made of wear-resistant PTFE compounds. The pressure ring typically consists of PEEK.
For the sealing requirements of the oil and gas market, Parker offers a range of materials with NORSOK and NACE approvals. A list of these materials is available on request.
Advantages over conventional elastomer-based chevron packing sets:
• Chemical and thermal advantages of PTFE over elastomer compounds.
• No special tooling required.
• Fast design and short manufacturing times.
• Simpler system design and installation as no mechanical activation elements are necessary.
Range of Application:
• Valve stems
• Machines with very fast reciprocating movements
• Forging presses
• Injection molding machines
• Hydraulics in steel mills
• Marine hydraulics
• Petroleum production
