1. When five sides of a water cube are blocked, put a piston on the only side that is free, and then add a switch to control the water. You can use this mechanism as an automatic harvester.
2. No, the valve is a control part in the fluid conveying system, which has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. The valves used in the fluid control system range from the simplest stop valve to various valves used in the extremely complex automatic control system.