...ve 冷水工作压力 Cold Working Pressure 圆柱体气缸 Cylinder 直流电 Direct Current 双阀瓣 Double Disc 暗杆 Non-Rising Stem 认 证的产品 Indicates product has been approved by Underwriter's Laboratories, Inc. 真空 Vacuum .
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暗杆-内螺纹结构用于青铜和铸铁闸阀。
Non-rising-inside screw stems are used in bronze and iron gate valves.
按阀杆的螺纹位置划分，可分为明杆闸阀和暗杆闸阀两种。
Position by the valve stem threads are divided into clear and dark bar bar gate valve two...
型号1710平衡阀为暗杆结构，配置抛物线（塞）形阀瓣。
The Fig. 1710 Balancing valve is a non-rising stem design incorporating a parabolic (plug) shaped disc.
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