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A Brief Overview of Gradient Valves


What is a gradient valve, and why would you use one? Product Manager Attila Kiss provides a quick overview of these unique, versatile valves.

Video filmed at Clippard in Cincinnati, Ohio


What is a gradient valve, and why would you use one? The term gradient valve is an industry-specific term which simply means it's a mixing valve. The NIV series is an isolation valve. The gradient valve is a combination of multiple standard NIV valves that can mix multiple solutions to an output, or dispense from an output to multiple solutions. The fluid path is made of PTFE, which has excellent chemical compatibility. It is ideal to use with corrosive media or gas applications.

The gradient or mixing valve incorporates two, three, four, or six separate media sources into one stream that is integral to a single block. In a selecting application, the combination of valves have independent inlets and one common outlet. Whereas in a diverting application, we have one common inlet and multiple independent outlets. These valves are useful for solvent selection, stream splitting, flushing, and other automated applications.

Depending on your flow requirements, gradient valves come in four different sizes, ranging from 1/32 to 1/56 orifice, or power consumption from 1 Watt to 7.2 Watts. Combining valves on the same manifold reduces space, number of connections, and leak points. And finally—simplicity. You can just use one valve that does everything that you need.

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