Which two valve types are typically used on a boiler blow-off line?

Which two valve types are typically used on a boiler blow-off line?

• A. Angle globe and quick-opening
• B. Gate and plug valve
• C. Ball and check
• D. Butterfly and diaphragm

Answer: (A)

Boiler blow-off lines need to vent hot, potentially dirty water quickly, with reliable shut-off and resistance to high temperature and flow debris. An angle globe valve provides tight sealing and good throttling in a compact, straight-through path that fits well on a drain line and helps minimize flow resistance and debris buildup. A quick-opening valve is designed to open rapidly with minimal handle movement, enabling fast blow-down when you need to purge the line and relieve pressure. Together, they allow fast, controlled drainage and dependable isolation, which is why this combination is typically used for boiler blow-off lines. Other valve types don’t match both the speed of operation and the reliable shut-off required in this hot, high-flow, potentially dirty service.

Boiler blow-off lines need to vent hot, potentially dirty water quickly, with reliable shut-off and resistance to high temperature and flow debris. An angle globe valve provides tight sealing and good throttling in a compact, straight-through path that fits well on a drain line and helps minimize flow resistance and debris buildup. A quick-opening valve is designed to open rapidly with minimal handle movement, enabling fast blow-down when you need to purge the line and relieve pressure. Together, they allow fast, controlled drainage and dependable isolation, which is why this combination is typically used for boiler blow-off lines. Other valve types don’t match both the speed of operation and the reliable shut-off required in this hot, high-flow, potentially dirty service.