227 dp indicator
227 DPI implements DPU 224/224C. The system consists of a dual bellows assembly (one high pressure and one tiny bellow pressure), which is separated by a set of two stress housings (pressure caps). The dual bellows setup consists of two inner bellows, a key board, overrange valves, a temperature compensator, a torque tube assembly, and coil springs. The bellows and the center board are filled with a non-corrosive liquid and then shut. The stress housings, located on either side of the center board, are connected by pipe or tube to the primary control unit.
Differential temperature differences within the power enclosure cause the bellows in the route of decreased stress to expand / contract laterally. The lateral movement of the bellows is converted into linear rotation as transmitted to the torque tube engine by the driving arm. The torque tube setup provides mechanical efficiency in response to bellow movement and operates on the scheme of process monitoring systems.