The packing for pneumatic four-way ball valves employs braided, flexible graphite seals or PTFE seals, ensuring reliable sealing of the valve stem under adequate lubrication conditions. As required, ball valves can be designed with anti-static structures, incorporating conductive springs between the ball and stem, and between the stem and valve body. This prevents static sparks from igniting flammable substances, ensuring system safety. Various sealing pair configurations are available.