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PTFE Chevron Packing Prädifa
Chevron sealing set, single-acting. Consists of a radial FlexiSeal®, followed by several V-rings and an anti-extrusion ring.
Product Overview
Tech Specifications
Product Support
PTFE Seals Design Guide--PTD3354
Storage and Cleaning of Elastomer Seals--PTD3032
Mixing the right ingredients: Material Development at Parker-Prädifa
Parker Final Exam in Physics / Sealing Systems Put to the Test
Industry Oil & Gas
Description
- 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.
- Valve stems
- Machines with very fast reciprocating movements
- Forging presses
- Injection molding machines
- Hydraulics in steel mills
- Marine hydraulics
- Petroleum production
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:
Range of Application:
Description
Performance Characteristics
Polymer Material Options
Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®)
Polyether Ether Ketone (PEEK)
Maximum Operating Temperature
315 °C
Minimum Operating Temperature
-260 °C
Operating Pressure
30000 psi
2068 bar
Maximum Surface Speed
< 5 m/sec
For Fluid Type
Ultra Broad Range
Application
Slow Rotating or Reciprocating Applications Like Stem or Seat Seals in Valves
Pumps and Compressors
Product Type
Rod Seal
Piston Seal
Custom Shapes
Specifications Met
NORSOK M-710
API 6A
NACE
Industry
Oil & Gas
General Industrial
Division
Prädifa Technology Division
Technology
Sealing & Shielding
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE. This document and other information from Parker-Hannifin Corporation, its subsidiaries and authorized distributors provide product or system options for further investigation by users having technical expertise. The user, through its own analysis and testing, is solely responsible for making the final selection of the system and components and assuring that all performance, endurance, maintenance, safety and warning requirements of the application are met. The user must analyze all aspects of the application, follow applicable industry standards, and follow the information concerning the product in the current product catalog and in any other materials provided from Parker or its subsidiaries or authorized distributors. To the extent that Parker or its subsidiaries or authorized distributors provide component or system options based upon data or specifications provided by the user, the user is responsible for determining that such data and specifications are suitable and sufficient for all applications and reasonably foreseeable uses of the components or systems...
