Danfoss KVC Series

The Danfoss KVC is a hot gas bypass regulator applied for adapting compressor capacity to the actual evaporator load. Part of the KV family of mechanical regulating valves, the KVC bypasses hot discharge gas to the low-pressure side when suction pressure falls below the set value, maintaining a minimum suction pressure and preventing excessively low evaporating temperatures during part-load operation.

Where the CPCE regulates with direct suction-line reference, the KVC provides a simpler, compact bypass solution widely used in commercial refrigeration and smaller industrial plants.

Types available: Danfoss KVC 12 (½" flare or ½" ODF solder, about 2.0 TR on R404A/R507), KVC 15 (⅝" flare or ⅝" ODF solder, about 3.9 TR) and KVC 22 (⅞" ODF solder only, about 5.0 TR). Those three are the whole range — there is no KVC 28 or KVC 35.

Flare nuts are not supplied with the valve and are ordered separately. For higher capacities or where an external pilot is wanted, the CPCE is the sibling regulator — Danfoss sells both under one hot-gas-bypass family.

Fit a KVC when a compressor short-cycles on light load, an evaporator ices up at low load, or a plant with no unloading steps has to keep running down at part duty. Send the refrigerant, the minimum suction pressure you want to hold and the line size.