What should be done before switching the transfer valve on a two-stage pump?

Before switching the transfer valve on a two-stage pump, bringing the RPMs to idle speed is essential for a few reasons. Operating a pump at idle helps to stabilize the system and reduces the risk of sudden pressure changes that could lead to damage or inefficiencies during the transition phase. When the pump is at idle, it ensures that there is no excessive pressure build-up, which facilitates a smoother switch of the transfer valve from the volume mode to the pressure mode.

In contrast, operating at maximum RPMs could potentially cause a surge in pressure, risking the integrity of the equipment and complicating the valve switch. Additionally, checking the pressure gauge readings, while important for overall monitoring, does not directly prepare the pump for the transfer valve operation. Ensuring the pump is engaged is also less relevant at this moment, as the focus is specifically on the correct RPM setting to facilitate a safe and effective transfer.