Dual-expander graphite packing sets with sacrificial zinc washers prevent galvanic corrosion in LNG ball valves. The zinc acts as an anode protecting stainless steel stems while graphite rings maintain sealing integrity after zinc consumption, extending service life in coastal LNG terminals https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/