the controller the energy supplied can be full power for maximum movement to be used in on off applications or proportional from a controller the controller will usually use feedback from any type monitoring system which may monitor pressures and or flow particularly downstream of the main valve seat because of the low power consumption of the piezo unit it is possible for the unit to be powered by an on board battery and the battery can be recharged through a solar panel 22 on the valve this makes the valve particularly suitable for use at locations where utility supplied power is not readily available piezo units also give off electrical charges when they are moved such as with the vibrations from piping this may also be a means of collecting energy to keep the battery charged to operate the valve coupling this technology with wireless technology to send the valve control signals the valve can be operated without any wires for power or control like in the embodiment of fig1 and 2 the pilot valve of fig3 and 4 can include an antenna for receiving a wireless signal for controlling the valve accordingly the valve disclosed herein can be a totally wireless powered and actuated control valve and can lead to energy savings from reduced power consumption to operate solenoid coil operated valves although the.