The cleaning tube comprises an outer tube and an internal valve.
该冲洗管包括外管和内阀。
Internal valve trim is designed to ensure long service life and avoid unnecessary maintenance.
内部装饰阀的设计，以确保使用寿命长，避免不必要的维修。
The valve failing closed could be due to an internal blockage or failure.
阀门无法关闭的原因可能是内部堵塞或故障。
The cut-off valve type, the internal leakage is not allowed.
对于截断阀类来说，内漏是不允许的。
Internal exhaust valve increases down stroke speed.
内部排气阀增加下冲速度。
Test ports shall have internal check valve and be equipped with caps.
测试端口应该内置止回阀并配置阀盖。
Check if the control valve has internal leaking.
检查控制阀是否有内漏。
Check if the control valve has internal leaking.
检查控制阀是否有内漏。
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