What is a back pressure regulator?

A back pressure regulator is indeed a type of pressure controller, designed to maintain a specific pressure level in a system. It operates by modulating the flow of gas or fluid to keep the pressure downstream at a predetermined set point. By doing this, the regulator ensures that the processes relying on that pressure can function consistently and efficiently.

This device is particularly useful in applications where varying demand can lead to unpredictable fluctuations in pressure. By maintaining back pressure, it helps to protect downstream equipment from receiving pressures that exceed their design limits, thus ensuring safe and optimal operation. The functioning of a back pressure regulator is crucial in various industrial applications, including chemical processing and HVAC systems.

In contrast, the other options represent different devices with distinct functions: an evaporator affects phase change processes, a safety device is used for protective measures in systems, and a temperature controller regulates temperature, not pressure.