| 摘要 |
inserting a spring in a magnetized rod at the assembly of a safety valve; pressing the spring by use of a special auto clamp; holding the upper part of the magnetized rod; thereby preventing the immersion of the magnetized rod in the free body in case of changing a valve seat. In this way, the device enables the convenient assembly preventing immersion of the magnetized rod, reduces man power working time, and improves productivity.
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