Which component is vital for improving water delivery in jet pump systems?

The flow control valve plays a critical role in improving water delivery in jet pump systems. This component regulates the flow rate of water through the system, ensuring that the pressure remains consistent and adequate for effective operation. By adjusting the flow of water, the valve can optimize the performance of the pump, allowing it to maintain a steady output and operate efficiently under varying demand conditions. This regulation is essential, particularly in systems where fluctuating water demand can lead to pressure losses or surges that affect performance.

While the pressure gauge is important for monitoring the system's pressure, it does not directly control the water delivery. The pneumatic actuator and the expansion tank have specific roles within a system but do not primarily focus on the immediate improvement of water delivery, which makes the flow control valve the essential component for this purpose.