Function Type C10F - 1:1 ratio with fixed orifice
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.
Operation of both types D10 and C10F is similar: System pressure at A(P), is determined by manual pilot adjustment. Orifices in AP and X ports dampen poppet reaction time, preventing instability. Connecting port Z1 to tank (via an appropriate remote control valve) vents the system pressure at port A(P) to a level equivalent to insert poppet spring load plus override pressure.