In a direct-drive pump system, what component connects the motor shaft to the circulator pump shaft?

In a direct-drive pump system, what component connects the motor shaft to the circulator pump shaft?

• A. brass coupling
• B. steel bolt
• C. rubber belt
• D. plastic clamp

Answer: (A)

Connecting the motor shaft to the circulator pump shaft in a direct-drive system is done with a coupling. The coupling locks the two shafts together so they rotate as one unit, while allowing for a little misalignment and thermal movement that naturally occurs between the motor and the pump. A brass coupling is a common and good choice here because brass resists corrosion from water and provides a durable, reliable way to transmit the motor’s torque without slipping. It keeps the connection tight and smooth in a wet environment. The other options wouldn’t work for this setup: a bolt wouldn’t provide a proper shaft-to-shaft connection with the needed torque transmission; a rubber belt indicates a belt-drive, not direct-drive; a plastic clamp wouldn’t withstand the torque, vibration, or exposure to water.

Connecting the motor shaft to the circulator pump shaft in a direct-drive system is done with a coupling. The coupling locks the two shafts together so they rotate as one unit, while allowing for a little misalignment and thermal movement that naturally occurs between the motor and the pump. A brass coupling is a common and good choice here because brass resists corrosion from water and provides a durable, reliable way to transmit the motor’s torque without slipping. It keeps the connection tight and smooth in a wet environment. The other options wouldn’t work for this setup: a bolt wouldn’t provide a proper shaft-to-shaft connection with the needed torque transmission; a rubber belt indicates a belt-drive, not direct-drive; a plastic clamp wouldn’t withstand the torque, vibration, or exposure to water.