Sure, it’s this one:
JORC 5523 Combo-D-Lux 1/2" NPT 115 Volt Drain Valve
I got it from eCompressedair.com. It is programmable for a bunch of scenarios and on/off times, and one of the modes is “every power on, drain for (adjustable) seconds, then nothing, repeat at next power on”.
I bought a very inexpensive 240V to 12V power supply and wired it across the 240V single phase motor. When the motor turns on, the 12V comes up, the valve drains for x seconds and shuts off.
Edit: This is a less than $5 power supply, smaller than a pack of cigs.
Edit 2: oh how soon we forget. The power supply was for the remote switch function, switching 12V low power instead of trying to switch the full motor current. I posted about this. The drain was even easier. It takes up to 250VAC for power, so I wired the drain across the motor, no additional supply needed.
