ARM Automation’s SplashBotix division has developed a compact, low-voltage submersible proportional valve intended for continuous underwater use in environments such as swimming pools and ocean water. Unique in its design, the device integrates magnetic coupling, fluid dynamics and robust materials selection to achieve precision control with high reliability and minimal maintenance. Casting is followed by impregnation with a proprietary polymer that fully seals porosities inherent in cast metals, thereby preventing water ingress. Garland noted the important role of seal elimination: “The whole premise, the whole reason for the magnetic coupling was to get rid of any dynamic seals,” he said. “Dynamic seals over time fail, so we use magnetic to drive the spool through solid billet stainless…so there is no path to leak.