The Solenoid Valve is a widely used electromechanical device in water and wastewater treatment plants, playing a crucial role in SCADA‑based automation systems. Solenoid valves control the start/stop and regulation of liquid flows in various process lines such as chemical dosing circuits, filtration bypass loops, backwash systems, and raw water distribution networks. These valves are actuated electrically — when a current is applied to the solenoid coil, a magnetic field is generated that moves a plunger or diaphragm to open or close the valve. This action allows fast, reliable remote control of fluid flow without manual intervention — a key requirement for automated SCADA strategies that rely on real‑time control and alarms.
Solenoid valves are available in a range of sizes (from small 1/8″ to larger 2″ ports) and configurations (normally closed, normally open, 2/2‑way, 3/2‑way) to suit different applications. Materials such as brass, stainless steel, and EPDM or FKM seals make them suitable for handling potable water, wastewater, and aggressive fluid streams found in treatment environments. They can be driven by standard voltages such as 24 V DC or 110–230 V AC, and their switching times are typically very fast (milliseconds), enabling rapid on/off control in response to SCADA logic or PLC commands.
In a SCADA architecture, solenoid valves receive control signals from PLCs or RTUs based on process conditions such as level thresholds, pressure limits, or quality sensor alarms. For example, if a turbidity sensor detects high particulate loads, SCADA may command a solenoid valve to redirect flow to a backwash circuit. Similarly, solenoid valves integrated into chemical dosing systems allow the SCADA logic to precisely time or pulse chemical feeds, which improves treatment performance and reduces chemical waste. The valves’ state (open/closed) is also fed back to SCADA to confirm execution and trigger alarms if expected actions do not occur. This real‑time feedback enhances safety, reliability, and operational transparency. Solenoid valves are designed for industrial usage, often featuring IP65 or higher enclosures, corrosion‑resistant bodies, and seal materials compliant with water contact standards (e.g., WRAS, ACS, KTW for potable water). They are versatile enough to be used inline, as drain valves, or in bypass loops, supporting automated control, process sequencing, and emergency shutdown functions in fully automated treatment systems. Their compact size, rapid actuation, and integration capabilities make them indispensable in SCADA implementations.
ODE Water Solenoid Valves 1/8″–1/4″ Catalog (PDF) https://pdf.directindustry.com/pdf/ode/water-solenoid-valves-1-8-1-4/39802-30253.html