pneumatically-operated direction valve

例句：

1. 1. The pneumatically-operated direction valve is essential forthe proper functioning of the system.
   气动操作方向阀对于系统的正常运行至关重要。
2. 2. The engineers had to replace the old pneumatically-operated direction valvewith a new one.
   工程师们不得不用一个新的气动操作方向阀来替换旧的。
3. 3.The pneumatically-operated direction valve was designed to improve efficiencyand reduce maintenance costs.
   气动操作方向阀的设计旨在提高效率和减少维护成本。