An Isolation Valve is used in fluid management to stop the flow of process fluids in a pipeline, this is usually for maintenance or safety purposes. They can also be automated to provide flow path selection to change the flow path in a continuous or batch process.

How does an isolation valve work?

A diaphragm isolation valve—also known as a “membrane valve”—is a solenoid-operated device that uses a diaphragm that extends and retracts to seal the valve seat and isolate the flow path. … This type of isolation valve can be constructed from inert materials, including an entirely inert fluid path.

What is the difference between isolation valve and control valve?

Control valve are typically designed for precision of fluid control, while isolation valves emphasize the mechanical robustness and sealing. For example, a ball valve isn’t a very good control valve because of the considerable non-linearity in its flow vs position function.