The Mark 66 is a highly accurate and economical air loaded pressure regulator that provides regulation from a local station or from a remote station.

The operation of the MK66 requires no control spring or pilot. Instead, a static air signal is applied to the top of the diaphragm to determine the setpoint.

The MK66 has a rangeability of approximately 40:1; the same as our pilot-type sliding gate regulator, the MK67. However, unlike other piloted regulators, the MK66 has no minimum differential pressure requirement, and because of its lack of a pilot valve, the MK66 is not as susceptible to problems caused by dirty service.