Are globe valves acceptable in blowoff piping connections?

Globe valves are generally not preferred for blowoff piping connections due to their design, which may not allow for quick and effective opening and closing. Blowoff connections are critical in systems where quick isolation and draining are necessary to remove sediment, sludge, or other build-ups that can compromise system efficiency.

The cock type valves, like the ball or gate valves, are typically recommended for these applications because they provide a full flow path with less resistance, leading to improved drainage capabilities. This characteristic is crucial in maintaining the integrity and operation of hydronic systems, as efficient blowoff reduces the risk of system failures and ensures proper maintenance.

While some might argue that globe valves could be acceptable based on specific circumstances, such as when specified by the manufacturer or under particular design criteria, the standard practice is to favor cock type valves due to their operational effectiveness in these critical blowoff applications.