The gate valve stem functions as a critical linear actuator, converting rotational input into vertical motion to raise or lower the gate. Unlike the quarter-turn movement of a ball valve stem, this stem is defined by its precise linear travel, sustained thrust, and ability to endure significant structural loads, which are essential for the valve’s role as a dependable full-bore isolation device.
It must effectively translate handwheel or actuator torque into substantial axial thrust to seat and unseat the gate against fluid pressure and friction. The stem must resist bending, buckling, and thread deformation, maintaining stability to ensure proper gate alignment and prevent jamming.
For demanding environments such as offshore or oil and gas industries, duplex and super duplex stainless steels provide superior strength and chloride resistance. Additionally, non-ferrous alloys like Monel and Inconel are used in specialty applications requiring resistance to seawater corrosion or high temperatures.
