未通MR450E-D1B1N1N1N0301/34268 MR450E-D1N1N1C1N0500/59427 MR450E-D1N1N1N1N0502/60916 MR450E-D1N1N1S1S0500/59564 MR450E-D1N1N1T1N0500/Y59822 MR450E-D1N1U1C1NX0500/60266电时阀芯3被复位弹簧4保持在中位或起始位置(脉冲式阀除外)。