A T-piece connector replaced by four-way valve can effectively avoid the damage to the pump caused by a blockage in splitting capillary more accurately adjust the velocity of the mobile phase in microlitre grade, improve stability of the system. 由四通双分流系统取代三通单分流系统可有效的避免分流管堵塞对泵造成损伤,更加精确的调控流动相微升级流速,提高系统稳定性。