| 词条 | Valve exerciser |
| 释义 |
A valve exerciser is a device to turn a valve on and off repeatedly to try to stop the valve from becoming so stiff that it cannot be turned on or off. [1] References1. ^http://www.hurcotech.com/SpinDoctor.html {{engineering-stub}} 3 : Piping|Valves|Plumbing |
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