Al,
I think more relevant is
Quote:
<R03> Custom circuits and COTS electronics are expressly PROHIBITED if they:
A. Interfere with the operation of other ROBOTS.
B. Directly affect any output devices on the ROBOT, such as by directly powering a motor, supplying a PWM signal directly to a speed controller or supplying a control signal directly to a relay module (see Rules <R63> and <R64> for the specific exception regarding CANbus devices).
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(emphasis mine, also below)
Which, when combined with
Quote:
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<R50> Custom circuits shall NOT directly alter the power pathways between the battery, Power Distribution Board, speed controllers, relays, motors, or other elements of the robot control system (including the power pathways to other sensors or circuits). <snip>
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prohibit using a relay to alter the control path to a solenoid valve. Thus Eric VanWyck's succinct response.
Of course, it IS legal to use 24V to power solenoids as you quoted.