在开始检测前，检测组件上的所有针形阀都必须关闭。
Before starting test, all needle valves on test kit must be closed.
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电液伺服阀作为产品，在出厂前须进行严格测试。
As a product, before the servo valve leaves factory, it should be tested strictly.
所述前柄设有调节阀；
The front handle is provided with an adjusting valve;
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