The stem of a globe valve is a critical linear actuator designed for controlled throttling and positive shut-off. Unlike quarter-turn valves, its primary function is to precisely and repeatedly lift a plug or disc from a stationary seat ring to modulate flow, or to lower it fully to achieve a tight seal. This vertical travel demands a unique combination of mechanical precision, stability, and durability, making the globe valve stem central to the valve's performance in regulation services.
Austenitic stainless steels (304, 316 SS) are standard for their corrosion resistance and well-rounded properties. 316/316L is preferred for chemical services. Stems are often hardened or chrome-plated at thread and seal contact areas to resist wear and galling.
Duplex stainless steels offer superior strength and chloride resistance. For extreme chemical or marine environments, stems made from Monel, Inconel, or Hastelloy are specified.
