阀杆加长件
Stem Extension

　　阀杆加长件设计用于远程操作闸阀、截止阀或角阀，通过附加阀门阀杆加长件，使其长度达到所需要的远程操作位置。
　　Stem Extensions are designed to permit remote operation of gate, globe or angle valves by providing an extension to the valve stem long enough to reach from the valve to the desired remote operating location.
　　阀杆加长件由带连接在阀门上的联轴节的钢管长度，连接在手轮上的联轴节，或其它类型的操作机构组成。
　　The Extension consists of a length of steel tube with a coupling on one end to attach to the valve, and a coupling on the other end to attach to a handwheel or some other type of operating device.
　　所制造的阀杆加长件能够配合阀门上的手轮。因此，除非特别订购，否则加长件不配置手轮。
　　The Stem Extension is made to accept the handwheel from the valve to which it is being attached. Therefore, Extensions are not supplied with a handwheel unless it is special ordered.
　　订购或询价附加在美国尼伯科阀门的阀杆加长件，必须指明阀门水路中心线到手轮顶部的长度。这个长度是如下图所示的"A"。对于铸铁阀门加长件，请单独指明联轴装置。
　　Orders or inquiries for Stem Extensions to be attached to a NIBCO valve must include the dimension from the center line of the valve waterway to the top of the handwheel. This dimension is the ”A“ distance as shown below. Please specify separately coupling sets for iron valve extensions.
　　对于"A"尺寸超过12英尺的长阀杆加长件，必须提供适当的支撑。这个支撑应该是坚固的，并且有足够的强度防止“卷曲”、偏移或转移不正常负载到阀门上。这种支撑由用户自行采购配置。
　　Adequate support must be provided for Long Stem Extensions exceeding 12 ft. of ”A“ dimension. This support should be rigid and of sufficient strength to prevent ”wind-up,“ deflection or transfer of abnormal loads to the valve. This is a custom-built requirement provided by the customer.

阀门通径 Valve Size	"A"
	英寸 In.	毫米 mm.
2" 21/2" 3" 4" 5" 6" 8" 10" 12" 14" 16" 18" 20" 24"	21.00 21.50 23.50 28.00 31.00 35.00 45.00 53.50 63.00 74.00 83.00 91.00 100.00 118.00	533 546 597 711 787 889 1,143 1,359 1,600 1,880 2,108 2,311 2,540 2,997

阀门通径 Valve Size	"A"
	英寸 In.	毫米 mm.
2" 21/2" 3" 4" 5" 6" 8" 10" 12" 14" 16"	19.56 21.06 21.94 24.25 25.50 29.50 35.06 38.88 44.56 49.31 54.69	497 535 557 616 648 749 891 988 1,132 1,252 1,389