旁通
BYPASSES
在所有阀门上，都可以采用旁通。右边的表格可用来指导旁通尺寸的选择。有许多应用场合需要使用旁通来优化系统或提高阀门性能。推荐细节显示在第12至15页上。
Bypasses are available on all valves. The table
at right can be used as a guide for bypass size selection. There are a
number of applications where the utilization of bypasses is required to
optimize system and/or valve performance. Detailed recommendations are
shown on pages 12-15.
 如果需要X和Y的尺寸，请与我们联系。
For dimensions
"X" and "Y",
please contact
Velan's
Engineering
department.
热绝缘
Thermal Insulation
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符合MSS-SP45标准
闸阀（DN65至DN600）和截止阀（DN65至DN600）
600至2500磅级
IN ACCORDANCE WITH MSS-SP45
GATE (21/2-24") AND GLOBE (21/2-24")
CLASSES 600-2500
主阀门通径
英寸
Main Valve
Nominal
Pipe Size
in |
旁通通径
Bypass Nominal Pipe Size |
系列A(1)
Series A(1) |
系列B(2)
Series B(2) |
| 21/2 |
1/2 |
1/2 |
| 3 |
1/2 |
1/2 |
| 4 |
1/2 |
1 |
| 5 |
3/4 |
11/4 |
| 6 |
3/4 |
11/4 |
| 8 |
3/4 |
11/2 |
| 10 |
1 |
11/2 |
| 12 |
1 |
2 |
| 14 |
1 |
2 |
| 16 |
1 |
3 |
| 18 |
1 |
3 |
| 20 |
1 |
3 |
| 24 |
1 |
4 |
- 系列A包括用于在主管道开启前进行加温的蒸汽应用场合，或在流量有限的管道上平衡压力。
Series A includes steam service for warming
up before the main line is opened, and for balancing pressure
where the lines are of limited volume.
- 系列B包括输气或输液管道，通过平衡阀瓣两边的压力使得主阀门运行容易。
Series B includes lines conveying gases
or liquids where bypassing may facilitate the operation of the
main valve through balancing the pressure on both sides of the
disc (or discs).
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地轴架
FLOOR STANDS
 Velan地轴架由铸铁制成，如果必要的话，可配置青铜或钢部件。
Velan floor stands are made of cast iron with
bronze or steel parts where necessary.
这些地轴架分为两大类：一类配置手轮，没有齿轮执行机构；另一类配置转动曲轴执行机构和蜗轮或蜗轮和凸轮组合执行机构。
They are divided into two main classes: one class
with handwheels but no gearing, and the other class with cranking actuators
and worm gearing or worm and spur gearing combined.
有多种尺寸的地轴架可供选择，选择地轴架主要根据阀门的阀杆尺寸和阀杆负载。
The floor stands are available in a number of
sizes, and the size to be used depends on the stem size and stem load
of the valve.
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