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HVAC Pro Tip: Where Should You Place the Steam Control Valve in a Heating Coil
This is a question many engineers and contractors ask during HVAC steam system design. Here's the golden rule:
✅ Always place the steam control valve on the supply side of the coil – before the steam enters.
🔹 Better Temperature Control – Modulating steam before it enters the coil ensures precise control.
🔹 Prevents Coil Flooding – Stops steam flow when off, reducing the risk of water hammer and corrosion.
🔹 Positive Coil Pressure – Ensures proper condensate drainage through steam traps.
🔹 ASHRAE-Aligned Practice – Industry standards recommend supply-side placement for safety and efficiency.
⚠️ Placing the valve on the return side can lead to:
Negative pressure
Coil flooding
Water hammer
Poor heat transfer
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