Being directed against difficult disassemble of unilateral valve from oil isolated mud pump, a simple and effective tool for repairing of unilateral valve is designed.
针对油隔离泥浆泵单向阀拆卸难的情况，设计了简单有效的修复单向阀的工具。
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Conclusions The nano particles were isolated and cultured from calcified heart valve of rheumatic heart disease in suitable conditions.