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简介 - 阀门选型指南(2)
Introduction - Valve Selection Guidelines (2)

美国尼伯科有限公司
选型
Selection

  阀门的结构和采用材料多种多样。为了确保效率最高,成本最合理,系统使用寿命最长,阀门的正确选型非常重要。
  Valves are produced in a variety of design types and materials. Proper selection is important to ensure the most efficient, cost effective and long lasting system.

阀门功能
Valve Function
  • 启动 / 阻止流体流动
    Starting / Stopping the flow
  • 防止流体倒流
    Preventing reversal of the flow
 
  • 调节(平衡)流体
    Regulating (balancing) the flow
  • 释放流体压力
    Relieving the pressure of the flow
     
青铜球阀阀体结构
Bronze Ball Valve Body Styles
  青铜球阀端口尺寸
Bronze Ball Valve Port Sizes
     
  • 一件式结构没有潜在泄漏的通道,但是要求采用缩径端口的球体;因此,具有明显的压降。
    One-piece has no potential body leak path, but requires use of reduced port ball; thus, significant pressure drop.
  • 两件式结构是建筑领域最常采用的形式。具有最好的性价比。也可以提供不缩径,全流道或标准流道的球体。
    Two-piece end entry is most common in building services. Best price value. Available full- or standard-port balls.
  • 三件式结构成本最高,但是易于拆卸,并进行在线维修。可提供全流道或普通流道的球体。
    Three-piece is more costly, but is easier to disassemble and offers in-line repairability. Available in full- or standard-port balls.
 
  • 不缩径,全流道球阀提供的压降安全取决于管道的长度,甚至比闸阀还要好一些。
    Full-Port ball valves provide pressure drop equal to equivalent length of pipe, and even slightly better than gate valves.
  • 标准(普通)流道球阀的流道直径小于管道的公称通径,但是与截止阀相比,仍然具有好的多的流动效率。
    Standard (conventional) port balls are up to one pipe size smaller than nominal pipe size, but still have significantly better flow than globe valves.
  • 缩径流道球阀与单管流量相比,具有更大的限制,建议不要用于建筑领域管道,但可以用在危险材料的传输系统中。
    Reduced port ball valves have more than one pipe size flow restriction and are not recommended in building services piping, but rather for process piping in hazardous material transfer.
     

应用所应考虑的事项:
Service Considerations:

  1. 压力
    Pressure
  2. 温度
    Temperature
  3. 流体介质类型
    Type of fluid
    • 液体
      Liquid
    • 气体;即蒸汽或空气
      Gas; i.e., steam or air
    • 肮脏或研磨(侵蚀)性流体介质
      Dirty or abrasive (erosive)
    • 腐蚀性流体介质
      Corrosive
  4. 流体
    Flow
    • 开启-关闭或节流
      On-off or throttling
    • 需要防止回流
      Need to prevent back-flow
    • 关心压降
      Concern for pressure drop
    • 流速
      Velocity
  5. 操作条件
    Operating Conditions
    • 冷凝
      Condensation
    • 工作频率
      Frequency of operation
    • 可接近性
      Accessibility
    • 可用的通径 / 空间
      Size / Space available
    • 手动或自动控制
      Manual or Automated control
    • 需要无气泡关闭
      Need for bubble tight shutoff
美国尼伯科阀门的术语和缩写
NIBCO Valve Terms and Abbreviations
选配件:
Options:
  端口连接:
End Connections:
LL   联锁手柄
Locking Lever
  T   螺纹
Thread
PL   挂锁手柄
Padlock Lever
  S   焊接
Solder
M   停止记忆
Memory Stop
  TM   螺纹带ISO安装
Thread w/ISO Mt.
NS   NIB-SEAL® 手柄
NIB-SEAL® Handle
  G   带槽(卡箍)
Grooved
RD   圆形手柄
Round Handle
  TS   NPT x 焊接
NPT x Solder
OV   椭圆手柄
Oval Handle
  MTT   外螺纹 x 内螺纹
Male x Female
SV   安全孔阀门
Safety Vent Valve®
  CS   铜管
Copper Stub
SU   单个活接头端口
Single Union End
       
ST   250psi蒸汽应用
250psi Steam Service
       
VCL   垂直链条手柄
Vertical Chain Lever
       
HCL   水平链条手柄
Horizontal Chain Lever
       
HC   软管盖和链条
Hose Cap & Chain
       
CP   镀铬
Chrome Plating
       
IC   整体止回
Integral Check
       
W3   三通
3 Way
       
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