The structure and principle of the LV-3 type height control valve in Japan are described. And the common troubles appeared in application of the height control valve are analyzed.
介绍了日本LV 3型高度控制阀的结构和原理，并分析了该高度控制阀在运用中出现的常见故障。
LV systolic function were not impaired (3 cases).
左心室收缩功能正常(3例)。
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