How to correctly select valves for corrosive media?

To correctly select valves for environments involving corrosive media, one must have a detailed understanding of corrosion; this ensures the selection of appropriate valve materials and structural designs. Metal materials experience various forms of corrosion failure in industrial production. Different materials exhibit different forms of corrosion depending on the loads applied and the specific media environments involved.

Sodium-treated PTFE film

Sodium-treated PTFE film (also known as Sodium-etched PTFE film) is a specialized functional film created by treating the surface of PTFE film with a chemical etchant—such as a Sodium-naphthalene solution—to strip away some fluorine atoms and introduce polar groups. This process transforms the naturally non-stick Teflon surface into a brown, highly bondable surface. Essentially, it is a specialty material developed to solve the global challenge of bonding PTFE. The Sodium treatment triggers a chemical reaction on the otherwise inert surface, altering its polarity and rendering it "bondable," thereby enabling secure adhesion to rubber, metal, other plastics, or pressure-sensitive adhesives.

Reinforced Graphite Sheet

Graphite Sheet Reinforced with tanged metal insert is made from B201 Flexible graphite sheet through specially pressing or sticking process. The insert materials can be SS304, SS316, Nickel, etc. It used in kinds of conditions, and various gaskets.

Ramie fiber packing

Ramie Fiber Packing is Highest quality ramie fiber impregnated with light-colored, special PTFE and inert lubricant during square plaiting operation. It is not harsh on shafts and stems.

Acrylic Fiber Packing

Acrylic Fiber Packing is a braided sealing material manufactured from high-quality acrylic fibers. It is designed for general industrial applications where moderate temperature and chemical resistance are sufficient, and cost-effectiveness is a priority. This packing offers a balanced combination of good mechanical strength, excellent abrasion resistance, and reliable sealing performance at an attractive price point.

PTFE Packing

PTFE gland packing is a square or round braided sealing material made from polytetrafluoroethylene (PTFE) fibers. Installed in the stuffing boxes of pumps, valves, and agitators, it provides dynamic and static sealing for valve stems and rotating shafts by being compressed to fill the clearance space, thereby preventing fluid leakage. Commonly known as Teflon packing, it is a type of braided packing seal, distinct from expanded PTFE sheets or PTFE gaskets.