The Schneider Electric (Erie) VT2317G13A02A is a 24V normally closed sweat 2-way zone valve. In simpler terms, it's an electrically controlled valve used in HVAC systems to regulate water flow. When inactive (no voltage applied), the valve stays closed, stopping water flow. When energized with 24V AC, it opens, allowing water to pass. https://www.partshnc.com/vt2317g13a02a-schneider-electric-erie-24v-nc-34%22swt-2w-valve