In recent years, design solutions have been developed to improve the efficiency of small water turbines used to recover energy from potable water channels, in which contactless face seals are applied to seal the turbine shaft as it passes through the pressure housing. This article presents the results of experimental studies on a contactless bidirectional-groove dry gas seal intended for application in Pelton water turbines. The influence of the balance ratio k, the groove-to-land ratio γ, and the dam width s on the characteristics of barrier gas flow rate variations was analyzed. It was determined that the balance ratio has the greatest impact on the barrier gas flow rate at a given pressure. This influence is also greater than the effect of the number of grooves and their span for the set values of groove-to-land ratio γ and dam width s.