Sélectionnez les matériaux de siège de soupape souple appropriés

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:

Nom du matériau	Propriétés principales	Remarques	Plage de température
VIRGIN PTFE	Très faible coefficient de frottement et excellente résistance chimique.	FDA,ROHS,REACH approved	-40 ° C à 260 ° C
15% Glass Filled PTFE	Decreased compressive strength and lower deformation under load than virgin PTFE.	Matériau abrasif Résistance à la chaleur	-40 ° C à 260 ° C
25% Glass Filled PTFE	Similar to 15% Glass better wear  Heat resistance, higher compressive strength and lower deformation under load.	Matériau abrasif	-40 ° C à 260 ° C
PTFE chargé en acier inoxydable	Extrêmement résistant à l'usure. Excellente résistance et stabilité sous des charges extrêmes et à des températures élevées.	Can be used on steam and thermal fluid applications	-40 ° C à 260 ° C
TFM	Structure polymère beaucoup plus dense que le PTFE vierge. Meilleure capacité de récupération après contrainte.	Modified PTFE Polymer With optimized performance	-40 ° C à 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	Très résistant aux produits chimiques corrosifs, à l'exception des acides oxydants et des solvants organiques.	Also known as High Modulus Polyethylene (HMPE) or High Performance Polyethylene (HPPE)	-50 ° C à + 80 ° C
PCTFE	Excellent for cryogenic and Oxygen use.	A homo-polymer of Chlorotrifluoroethylene	-240 ° C à 120 ° C
PEEK Vierge 450G	Excellente résistance chimique et propriétés mécaniques à haute température.	An organic polymer thermoplastic	-40 ° C à 260 ° C
PEEK chargé de carbone	Nombreuses propriétés similaires au PEEK vierge. Particulièrement adapté aux températures élevées et aux charges importantes.	Low coefficient of friction and suitable for many extremely corrosive applications	-40 ° C à 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
Acétal et Delrin	Displays good resistance to wear and deformation under load.	Excellent for valve seat applications	jusqu'à 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	jusqu'à 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