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Screwed (Threaded) Control Valves in HVAC/BMS

September 3, 2025

When it comes to control valve selection, connection type plays a big role in system performance, installation speed, and long-term reliability.

Today, let’s talk about Screwed (Threaded) Control Valves 👇
🟢 Connection Type: Male–female threaded ends (BSP/NPT)
🟢 Size Range: ½” – 2” (sometimes up to 3”)

🟢 Typical Applications:
• Fan Coil Units (FCUs)
• VAV Boxes
• Small Air Handling Units (AHUs)
• Low flow, low pressure systems

✅ Advantages:
• Compact & economical
• Quick to install in small-bore piping
• No gaskets needed (PTFE/sealant handles sealing)

⚠️ Limitations:
• Not practical for large pipe diameters
• Maintenance is harder (often requires cutting)
• Threads may leak over time due to thermal expansion

👉 Choosing the right valve connection type saves time, cost, and prevents long-term issues in BMS/HVAC projects.

💡 What’s your go-to connection type for small HVAC systems — Screwed, Flanged, or Welded?

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