Function Type C - Pressure relief (ISO 7368)
The pressure relief function is obtained by using a model D10 or C10F (1:1 area ratio) insert poppet and either a model C or C3 cover. The C cover is a standard pressure relief function.
Factory-fitted orifices in the covers are sized such that a given relief cover can be used with either insert type. Further fine tuning to suit particular system requirements can be achieved by changing orifice sizes.