除了阀体以外，所有部件都是可更换部件。

All components except valve bodies are available as replacement parts.

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该文通过研究飞机可更换部件的使用与保障过程，建立其使用保障过程模型，并通过仿真模拟可更换部件的消耗过程。

By making research into the operation and logistic process of replaceable units on planes, we build its process model and simulate its consuming process.

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独特的设计，上机箱后盖液动(手动)可打开，使更换部件、维修更便捷。

Unique design of opening the rear cover hydraulically-operated (hand operated) make sure quick replacing of the parts and easy maintenance.

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