What is the process that happen when the timer opens and what opens the valve under the sink to get hot water to the faucet at the sink?

The MFG # 70600 - The Aqua Flash By-pass valve transfers the lukewarm water into the cold pipe. The valves maintain average 93° F (34° C) at the sink. The pump runs about 3 times an hour for 2 minutes. A built-in 24-hour mechanical timer allows the user to set the time when they want instant hot water. The MFG # 70601 - A sensor/switch built into the pump transfers the lukewarm water into the cold pipe. The under sink pump starts when temperature drops to 85° F (30° C) and stops when it reaches 104° F (40° C). The pump runs about 3 times an hour for 2 minutes. A built-in 24-hour mechanical timer allows the user to set the time when they want instant hot water. If further assistance is needed please contact our customer service department at 1-800-486-5256.