HART institutions: automatic control under normal circumstances you can not manually open and close the valve.
手操机构：自动控制在不正常情况下可以手动操作阀门的启闭。
The normal-closed electromagnetic valve has reasonable structure design and good close property ofthe valve port to prevent leakage completely.
它结构设计合理，阀口关闭 性良好，确保无任何泄漏。
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