The Mark 56 is a highly accurate and economical air loaded back pressure regulator that provides regulation from a local station or from a remote station. The operation of the Mark 56 requires no control spring or pilot. Instead, a static air signal is applied to the top of the diaphragm to determine the setpoint.

The JPR regulator or Mark 12 panel mounting loading stations are ideal for controlling the pressure load to the top of the diaphragm.