这种总成应该由两个正向密封止回阀， 两边夹着两个弹性阀座关闭阀， 并配置一个液压平衡旁路管线和四个测试旋塞构成。

The assembly shall consist of two positive seating check valves located between two resilient seated shutoffs with a hydraulically balanced bypass line and four test cocks .

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本实用新型形成滚刀总成重心平衡结构，确保了同一加工件获得均匀一致的铣刮表面。

In the utility model, a hob assembly gravity center balance structure is formed, thus ensuring that the same machined part can have a uniform milling surface.

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由此，本文大胆提出了新的战略目标-即寻求总成本(包括时间成本)和服务质量的平衡点。

Then present the new strategic goal: search for the equilibrium point of total cost and service quality.

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