What device collects moisture from the system while minimizing air pressure loss?

What device collects moisture from the system while minimizing air pressure loss?

• A. Main Drain
• B. Auxiliary Drain Valve
• C. Drain Valve
• D. Low-Point Drain

Answer: (B)

Removing condensate from a pressurized system while keeping pressure loss to a minimum requires a drain device that empties only the moisture without venting a large portion of air or steam. Condensation tends to form in lines and receivers, so you need a mechanism that can release that moisture without wasting energy. An auxiliary drain valve fits this purpose because it’s designed to purge accumulated condensate with minimal air release. It often operates in a controlled way—either automatically or with a small, restricted outlet—so it removes moisture without causing a significant drop in system pressure. In contrast, main drains tend to dump larger amounts of air or steam when opened, and low-point drains primarily collect condensate at the lowest point without addressing the need to minimize pressure loss across the entire system. A general drain valve can be manual and less selective, leading to unnecessary pressure loss. So, the auxiliary drain valve best meets the goal of collecting moisture while preserving system pressure.

Removing condensate from a pressurized system while keeping pressure loss to a minimum requires a drain device that empties only the moisture without venting a large portion of air or steam. Condensation tends to form in lines and receivers, so you need a mechanism that can release that moisture without wasting energy.

An auxiliary drain valve fits this purpose because it’s designed to purge accumulated condensate with minimal air release. It often operates in a controlled way—either automatically or with a small, restricted outlet—so it removes moisture without causing a significant drop in system pressure. In contrast, main drains tend to dump larger amounts of air or steam when opened, and low-point drains primarily collect condensate at the lowest point without addressing the need to minimize pressure loss across the entire system. A general drain valve can be manual and less selective, leading to unnecessary pressure loss.

So, the auxiliary drain valve best meets the goal of collecting moisture while preserving system pressure.