好施简介 | 美国洁具 | 美国热水器 | 美国阀门 | 美国泵 | 产品知识
总部网站
商务问答
联系方式
服务是我们的天职  Service Is Our Business
福建省厦门市建设大厦2509单元  邮编:361001  电话:592-2121956  传真:592-2122287  E-mail: 666@h6688.com
首页Home>正文Text
下一页Next
  美国尼必可阀门选型指南-建筑领域
Valve Selection & Specification Guide for Building Services

美国尼必可有限公司
阀门选型
Valve Selection Section

阀门选型、功能,及管道系统的主要因素
Function and service considerations

阀门结构种类、材质、认证
Valve Design, Materials, and Approvals

多回转阀门结构特点(1)
Multi-Turn Valve Design Detail(1)

多回转阀门结构特点 (2)
Multi-Turn Valve Design Detail (2)

90o回转阀门的结构特点(1)
Quarter-Turn Valve Design Detail(1)

90o回转阀门的结构特点 (2)
Quarter-Turn Valve Design Detail (2)

止回阀(防倒流)和流量平衡阀的结构特点
Check Valve (Backflow Prevention) Design Detail
Circuit Balancing Valve Design Detail

连接方式
End Connection
 

 

 
适用于建筑领域的阀门选型
Recommended Valve Specification for Building Services
室内冷热水系统阀门选型
Hot and Cold Domestic Water Service Specification

冷凝器和冷却水系统阀门选型
Condenser and chilled water specifications

热水暖气系统阀门选型
Hot water heating service specifications

低压(15 psi)蒸汽系统阀门选型
Low pressure steam service (15 psi) specifications

中压(15-125 psi)蒸汽系统阀门选型
Medium-pressure steam service (15-125 psi) specications

喷洒灭火器和消防系统阀门选型
Fire sprinkler and fire protection system specifications

压缩空气系统阀门选型
Compressed air specifications

真空系统阀门选型
Vacuum service specifications

医疗气体系统阀门选型
Medical gas service specifications

阀门制造商主要型号对照表
Valve manufacturer's condensed cross-reference list

  合金腐蚀,也就是所谓的“失锌现象”,在20世纪50年代已经从阀门产品中根除。但是,由于近来在美国国外生产的锻造或铸造阀门材料越来越多采用高锌合金(通常称为“黄铜”),因此“失锌现象”又开始有所回潮。
  De-alloying corrosion, known as ”Dezincification,“ was effectively eradicated from valve products in the 1950s. Today, however, this problem has returned with the increased use of high-zinc alloys (commonly referred to as ‘Yellow Brass’) in forged and cast valves typically produced outside the United States.

  失锌现象有选择地从合金中将锌排泄出去,使得材料变得多孔、铜含量过大,从而降低材料强度。使用中的阀门出现失锌想象时的物理特征包括:在外表面出现白色粉末或矿物污点。
  Dezincification selectively removes zinc from the alloy, leaving behind a porous, copper-rich structure that has little mechanical strength. The physical attributes of an in-service valve with Dezincification includes a white powdery substance or mineral stains on its exterior surface.

  如何解决这个问题?在所有青铜阀门的金属部件中,其水路部分的化学成分中锌的含量绝对不能超过15%。作为一种基本要求,美国尼必可青铜消防阀门都具有“抗失锌”特性,质量更加优异,使用寿命更加长。
  What’s the cure? On all bronze valves the metal components in the waterway must not contain more than 15% zinc in their chemical makeup. As a standard NIBCO bronze fire protection valves are made to be “Dezincification Resistant,” which is a seal of quality and longevity.

首页Home>正文Text
下一页Next