阀门操作方式及要求中的一句话？ the length of the wrench or diameter of the handwheel for direct or gear operated valves shall (after opening and closing a new valve at least four times) be such that a force not exceeding 380 newton (n) shall be required to operate from either the open or closed position under the maximum differential pressure recommended by the manufacturer. 仅作参考： 扳手（f扳手？）长度，或直动阀或齿轮阀手轮直径（新阀全开或全关至少4次后）应保证：在阀门商推荐的最大压差范围以内，要求以不高于380牛（n）的力从全开或全关阀位进行操作。 be such，想不出前半句的长度和直径和后一句“force”的关系，感觉在解释力矩。查看更多
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