PFA Lined Ball Valve Suppliers in China - Corrosion-Resistant Valves from Reliable Factory for Chemical Industry

Features

• PFA lining offers highest corrosion resistances.
• Bubble tight shut-off, precision machined ball and seats guarantees absolute leak free valve.
• Full bore offers high KV value equal to the pipeline.
• One piece ball-stem design, no possibility of damaging PFA lining on ball due to stem movement.
• All lining parts must pass spark test with 15KV high voltage, to ensure no air pathway within lining parts.
• Integral mounting pad design ensure no external force exerted on packing or valve top cap position, which leads to enlargement and inconsistency of valve output torque.
• Investment casting body construction, ensure smooth body surface with minimum machining work.

Technical Data

Standards

EN10204- 3.1 material certificate available.

High Corrosion Resistance and High Durability

Lined ball valve provides excellent corrosion resistance in industrial applications. It has good chemical stability, high corrosion resistance, low rubbing modulus, and self-lubricate features, which is suitable for alkali and acid applications in semi-conductor manufacturing process, gas, and pharmaceutical applications.

The valve body is designed with stem-ball one-piece design for better molding of PFA lining material. With stem and ball assembled together, contact between ball and stem is eliminated, thus, provides strong body strength against media flow.

Seal Effects

Multiple seal structure prevent leakage to minimum. The first sealing comes through thrust washer for tight sealing effect. The second sealing is V-shape structure packing system with flexible feature. The more pressure comes from valve bore, the more tightened it will become. For high demanding requirements, spring set is used to uniformly compress packing downward for actuator applications.

Spark Test

During production, the liner integrity of each liner component is checked by using an electrostatic discharge "spark" tester. The entire lined surface is tested at a voltage of 15kV to identify any voids, cracks or pinholes that indicate gasket rupture.

Material Selections

PFA has alkoxy substitutes in which it can be melt-processed. However, it also differs from a molecular level as it has a smaller chain length than other fluoropolymers. It is extremely durable which makes it suitable for use in demanding application. It is also the preferred option when it comes to choosing a material that requires high chemical resistance as well as high purity and low stiffness while it is also extremely durable when it comes to resisting weathering. It has a lower melting temperature when compared to PTFE while it has great insulation properties and is UV resistant which also adds to its durability.

FEP has non-stick properties which again makes it suitable for use in applications where residues or oils are likely. FEP does have a softer makeup when compared to that of PTFE and that means that it can melt at a lower temperature which means that it is not suitable in applications that are exposed to high temperatures. Along with this, it is also transparent while it is resistant to sunlight and UV which makes it suitable for use in applications that are exposed to the elements.

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