详细说明：3R,4R,系列手拉阀手拉阀3R210-06,手拉阀3R210-08,手拉阀3R310-10,手拉阀3R410-10,手拉阀4R210-06,手拉阀4R210-08,手拉阀4R310-10,手拉阀4R410-15手拉阀)