Where should a rising stem globe valve be installed for steam flow control?

A rising stem globe valve is specifically designed for throttling applications and is ideal for regulating flow in piping systems, especially in steam services. Installing it in the bypass line around a steam flow regulating valve allows for precise control of flow rates without directly impacting the main steam line. This configuration ensures that the main flow can be regulated effectively while also allowing for maintenance or operational adjustments to be made without disrupting the entire system.

In the main steam line, using a rising stem globe valve is less suitable because it could lead to excessive wear and potential failure due to the continuous high-pressure steam flow. Installing it directly after a check valve may not utilize its throttling ability effectively, as check valves primarily serve to prevent backflow rather than control flow. Lastly, placing the valve at the steam boiler outlet may not provide the necessary regulation needed for downstream systems, as the pressure and temperature conditions could be more variable and potentially harmful to the valve's performance.