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H) Install a bypass line for valve maintenance. (See Fig 3.5)
Fig 3.5 Example of Control Valve Installation
♣ NOTE
When the control valve has a problem, you may have to close the block valve and open the bypass valve to
control flow. Therefore, use a control valve that has the feature to control flow by opening the bypass valve.
Moreover, it is ideal to choose the same flow characteristics and size as those of control valve. Fig 3.6
shows an example of ideal control valve installation recommended by Honeywell.
Fig 3.6 Example of Control
Valve Installation Recommended by
Honeywell
Main steam line
5
4
6
응축수 회수관
Return line of Condensation Water
- 5 -
2
1
2
3
1
Control Valve
3
Bypass Valve
5
Strainer
6
Steam trap (Drain Valve)
4
2
Block Valves
Pressure gauges
4
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