The ASCO™ Series 209 proportional solenoid valves are designed to proportionally control the flow of air, inert gases, and liquids with high repeatability. It is actuated by varying the electrical input signal to the coil. This valve series sets a new benchmark in precise proportional flow control performance. It is designed to achieve the highest level of precision while using less power to allow system performance optimization and efficiency. The valves are extremely versatile and can be used across multiple applications, from chemical dosing to coffee machines and from cooling systems to hydrogen fuel cell applications.