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Select the Correct Soft Valve Seat Materials
Ball valve seals are used in many different industries. As a leak-proof means of pressure and flow control, their smooth and reliable operation is critical–which is why polymer materials work extremely well for ball valve seats.
Ball valves are essential in allowing to cut or pass the flow and pressure of a piping system. Moreover, they are used in industries such as the petrochemical and pharmaceutical where leakage could represent a terrible consequence for the environment or the product itself. Therefore, the ball valve seat is critical in such situations since it is responsible for sealing the fluid inside and distributing the seating stress uniformly.
Selecting the appropriate ball valve seat materials is vital to guarantee the performance of the valve and the safety of the product and the environment. The most common ball valve seat materials include PTFE,TFM, filled PTFE, PCTFE, PEEK, and POM.
KEY PROPERTIES OF BALL VALVE SEAT MATERIALS
When choosing a polymer material for a ball valve seat, there are numerous factors that are involved. Key material properties include …
● Sufficient ductility to provide a reliable seal
● Dimensional stability to ensure the ball valve seat retains its shape for reliable sealing and performance
● Very low friction to keep stem torque at a minimum
● Low coefficient of thermal expansion so that the ball valve seat retains its shape when temperature changes occur
● Excellent wear resistance for a long service life
● Chemical compatibility with all media involved
Over the years, based on our own advantages in the field of high performance polymer materials, we continue to manufacture a wide range of soft seals for industry valves.
Polymer valve seat for choice:
| Material Name | Main Properties | Notes | Temperature Range |
| VIRGIN PTFE | Very low coefficient of friction and excellent chemical resistance. | FDA,ROHS,REACH approved | -40°C to 260°C |
| 15% Glass Filled PTFE | Decreased compressive strength and lower deformation under load than virgin PTFE. | Abrasive material Heat resistance | -40°C to 260°C |
| 25% Glass Filled PTFE | Similar to 15% Glass better wear Heat resistance, higher compressive strength and lower deformation under load. | Abrasive material | -40°C to 260°C |
| Stainless Steel Filled PTFE | Extremely hard wearing. Excellent strength and stability under extreme loads and elevated temperatures. | Can be used on steam and thermal fluid applications | -40°C to 260°C |
| TFM | Much denser polymer structure than Virgin PTFE. Displays better stress recovery. | Modified PTFE Polymer With optimized performance | -40°C to 260°C |
| Carbon Graphite filled TFM | Lower thermal expansion-contraction rate than conventional TFM. | Ideal for use on steam and thermal fluid applications | -40°C to 260°C and even 320°C on Thermal Fluid applications |
| UHMWPE | Highly resistant to corrosive chemicals, with the exception of oxidising acids and organic solvents. | Also known as High Modulus Polyethylene (HMPE) or High Performance Polyethylene (HPPE) | -50°C to +80°C |
| PCTFE | Excellent for cryogenic and Oxygen use. | A homo-polymer of Chlorotrifluoroethylene | -240°C to 120°C |
| Virgin PEEK 450G | Excellent chemical resistance and mechanical properties at elevated temperatures. | An organic polymer thermoplastic | -40°C to 260°C |
| Carbon Filled PEEK | Many similar properties to Virgin PEEK. Particularly suitable for elevated temperatures and high load situations. | Low coefficient of friction and suitable for many extremely corrosive applications | -40°C to 260°C |
| PFA | similar properties to Virgin PTFE.Also called Soluble PTFE | high modulus material providing both high and cryogenic temperature capability. | -80°C to 260°C |
| Acetal and Delrin | Displays good resistance to wear and deformation under load. | Excellent for valve seat applications | up to 80°C |
| VESPEL | A polyimide material that has high temperature capabilities under load and is mainly used for heat transfer applications, hot gases and oils. | Must not be used with STEAM | up to 80°C |
Applications
Valve seats and seat inserts - seats for all types of valves including ball valves, gate valves,butterfly valves and plug valves.
Valve stem seals - including chevron packing and all types of spring energized seals.
https://www.pvdf-ptfe.com/Ptfe
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