Someone asked whether my valve work with a high rating pump, I have a spare 40 watt pump, hook it up to the growth bed and here is the video evidence.
I can now say it work for pump from 12 watt ~ 40 watt. That 40 watt is a lot of water and I guess it about the limit for this size of a valve. If you need to use a bigger pump, just step up all the sizes to make it work.
However, with the standard 25mm design it should work for most of us.
I use Nokia E71 for these videos, they are great !!!