旁路
By-Passes
旁路用于两个目的。第一，它们用于蒸汽应用中，在主阀门开启之前用来加热管道。第二，它们用于蒸汽管道和其它管道管道上，用来平衡主阀门楔形闸板或阀瓣两侧的压力，以帮助打开大型阀门。
By-passes serve two purposes. First, they are
used in steam service to warm-up the line before the main valve is opened.
Second, they are used on steam and other lines to balance the pressure
on both sides of the main valve wedge or disc to aid in opening a large
valve.
如果指定的话，美国太平洋阀门可以配置所有焊接旁路。旁路配置在单个外螺纹和轭架截止阀上，其压力/温度等级和防腐蚀等级应该等于或者超过主阀门。
Pacific valves can be furnished with all welded-on
by-passes when specified. By-passes are equipped with a single OS&Y
globe valve with a pressure/temperature rating and corrosion resistance
equal to or exceeding that of the main valve.
主阀门通径：
Main valve size: |
11/2" - 4" |
5" - 8" |
10" - 36" |
旁路通径：
By-pass size: |
1/2" |
3/4" |
1" |
通径DN100以上的阀门配置的旁路符合MSS标准操作规程SP-45, 系列A.
By-passes on valves 4" and larger are furnished
to comply with MSS Standard Practice SP-45, Series A.
小通径截止阀
Smaller Globe Valve
正视图
Front View
侧视图
Side View
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闸阀旁路一般情况下配置在主阀的侧面，两个阀门的阀杆平行并且朝上(位置A与B之间)。
Gate valve by-passes shall be regularly attached
to the side of the main valve with the stems of both valves parallel and
pointing upward (between locations A & B).
截止阀的旁路一般情况下配置在主阀的右侧，两个阀门的阀杆平行，并且朝上。截止阀的右侧是指当面对朝向阀瓣下方的流体端口时右边的一侧(在位置E和F之间)。
Globe valve by-passes shall be regularly attached
to the right side of the main valve with the stems of valve parallel and
pointing upward. The right side of the globe valve is the side at the
right when facing the flow port which leads to the underside of the disc
(between location E & F).
如果需要的话，排出阀、排泄阀和旁路管道可以配置手动或遥控执行机构阀门。
Bleed, drain and by-pass piping can be furnished
with manual or remote actuated valves, as required.
在应用条件允许安装较大的旁路的地方，建议旁路的安装要环绕着主阀门。
Where service conditions warrant larger-than-standard
by-passes, it is recommended that the installation of the by-passes be
around the main valve.
闸阀和截止阀
Gate & Globe Valve
底视图
Bottom View
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