Benefits of a Process Pressure Controller versus a valve?

For precise control of the pressure in a process chamber, or to control the pressure in your system, electronic (digital) pressure controllers are used. Such a pressure controller regulates a control valve, allowing to increase the pressure inside the process chamber. To relief the pressure, traditionally bleed valves are used, continuously venting to the environment.

In case of expensive or dangerous process gases this is not preferred. In that case often an additional valve with valve steering unit is used to control the relief. These additional components makes the system complex.

The P-800 Process Pressure Controller series has an integrated relief valve, reducing the components and avoiding continuously venting to the environment.

Check out the benefits of the P-800 Process Pressure Controller compared to a conventional solution using a bleed valve and a solution with a separate relief valve:
 

Why use a P-800 Process Pressure Controller instead of a bleed valve or separate relief valve?