... of a bellows or a spiral pressure element. XGY KFK (Adjustable Range Type) Pressure Indicating Controller-KF series ... such as temperatures, pressures, flows and liquid levels.-Model KFK Pressure Indicating Controllers (adjustable range type) indicate and control ... displacement of a bellows or a spiral pressure receiving element.-KFK Model No.17 SpecificationsPressure element: BellowsMeasuring range: 0- ...