# General Resistances

There are many types of pipe fittings that offer a resistance to flow that do not fit logically into the existing component groups. These types are available from the General Resistances of the Component palette. The resistance of many types of fittings can be described by K, Kf or Kv type relationships. In addition this group of elements contains the following specific pipe fittings: Filter; Packed bed; Cyclone; Labyrinth Seals; Expansion Joints and Stuffing Boxes; Centrifuge; Pipe Coil; Tube Bundles (flow inside and outside); and Constant Head Loss elements. For those devices that do not fit into any of the above categories, there is a User Defined Generic element that can be used to define any pressure loss against flow relationship.