of trapped gas forms in the line 120 b which is beneficial for the operation of the control system 100 for example this trapped gas acts as a compressible buffer and can help avoid vapor lock in the system 100 in any of the configurations of fig3 a 3c if the balance control line 120 b line is ever lost the regulator 150 can bleed hydraulic pressure from the primary line 120 a to the balance control line 120 b to achieve any of the various purposes disclosed herein details of the regulator 150 for the control system 100 are shown in fig5 a 5b the regulator 150 is shown in a closed condition in fig5 a and is shown in an opened condition in fig5 b as shown the regulator 150 has a housing 160 defining an internal passage therein so that this arrangement represents the regulator 150 designed as a separate component from the safety valve 50 however as noted previously it will be appreciated that the regulator 150 can be part of the safety valve 50 and the regulator 39 s housing 160 can actually be components of the safety valve 50 itself moreover the housing 160 can be constructed in ways known in the art for facilitating its assembly which may not be depicted in the drawings the housing 160 has a primary port 162 with a hydraulic fitting 163 for connecting to the primary control line 120 a with a flow tee or the like the primary port 162 communicates with an intermediate barrel chamber 166 through a choke passage 164 a sleeve 170 installs in.