"Send us a 2-inch valve." Sounds simple — until the DIN line, the ISO line and the American line all turn out to have different outside diameters. Here is the comparison table our engineers use every day, and the five rules that prevent 90% of sanitary connection mistakes.

In hygienic plants, seals — not valve bodies — cause over 80% of valve service issues, and most of them announce themselves weeks in advance. This guide walks through the symptoms our service engineers meet most often, what each one really means, and the maintenance rhythm that keeps AB valves leak-free for years.

Surface treatments fall into three categories: chemical (addressing corrosion resistance), mechanical (addressing appearance), and electrochemical (addressing both). When selecting a method, first consider three factors: the required level of corrosion resistance, the strictness of cleanliness standards, and the budget.

Stainless steel relies on an extremely thin "chromium oxide film" (passivation layer) on its surface to prevent rust; while corrosion-resistant, it is not immune to rusting forever. Rust will occur if this film is damaged, contaminated by iron particles, or exposed to overly harsh environmental conditions.