1、先导气全封闭内排式，适用于超净环境，也可防止外办粉尘封闭内部污染；
2、线畔功耗低，AC型为2VA、DC型为1W；
3、反应速度快、作动灵敏、长时间工作，换向性能稳定；
4、内部与外部先导方式可选；
5、线圈（先导阀）与阀体可灵活、多方向安装；
6、底座与4V系列通用
PB4*50-S-U PB4*60-S-U PB4*75-S-U PB4*80-S-U PB4*100-S-U PB4*125-S-U PB4*150-S-U PB4*160-S-U PB4*175-S-U PB4*200-S-U PB4*250-S-U PB4*300-S-U PTB PSB PB4*5-S-R PB4*10-S-R PB4*15-S-R PB4*20-S-R PB4*25-S-R PB4*30-S-R PB4*40-S-R PB4*50-S-R PB4*60-S-R PB4*75-S-R PB4*80-S-R PB4*100-S-R PB4*125-S-R PB4*150-S-R PB4*160-S-R PB4*175-S-R PB4*200-S-R PB4*250-S-R PB4*300-S-R PTB PSB PB4*5-S-CB PB4*10-S-CB PB4*15-S-CB PB4*20-S-CB PB4*25-S-CB PB4*30-S-CB PB4*40-S-CB PB4*50-S-CB PB4*60-S-CB PB4*75-S-CB PB4*80-S-CB PB4*100-S-CB PB4*125-S-CB PB4*150-S-CB PB4*160-S-CB PB4*175-S-CB PB4*200-S-CB PB4*250-S-CB PB4*300-S-CB PB6*5-S-U PB6*10-S-U PB6*15-S-U PB6*20-S-U PB6*25-S-U PB6*30-S-U PB6*60-S-U PB6*50-S-U PB6*60-S-U PB6*75-S-U PB6*80-S-U PB6*100-S-U PB6*125-S-U PB6*150-S-U PB6*160-S-U PB6*175-S-U PB6*200-S-U PB6*250-S-U PB6*300-S-U PTB PSB PB6*5-S-R PB6*10-S-R PB6*15-S-R PB6*20-S-R PB6*25-S-R PB6*30-S-R PB6*60-S-R PB6*50-S-R PB6*60-S-R PB6*75-S-R PB6*80-S-R PB6*100-S-R PB6*125-S-R PB6*150-S-R PB6*160-S-R PB6*175-S-R PB6*200-S-R PB6*250-S-R PB6*300-S-R PTB PSB PB6*5-S-CB PB6*10-S-CB PB6*15-S-CB PB6*20-S-CB PB6*25-S-CB PB6*30-S-CB