1.電磁換向閥electromagnetic directional valve（如果是強(qiáng)調(diào)用線圈做磁場，則為solenoid directional valve）

2. 疊加式液控單向閥stacked pilot-controlled check valve

3. 疊加式溢流閥stacked discharge valve

4. 疊加式單向節(jié)流閥stacked one-way throttle valve

5. 分流閥flow divider (valve)