ok folks, I should explain more.. But regardless I have realised that the direction doesn't matter, as I will need an extra sol valve for empty anyway! (Doh!) However I do hope such a valve will work with low pressure as it will rely on Siphon alone!
So this is for my fish tank. We have recently moved in to a new rented house, and the tank is now placed within the dining room. In my old house to do a water a change I would run a hose from the kitchen and prime with water from the tap, then move the hose out the back door and let the tank drain to required depth using siphon. Problem with this it was messy and required a certain amount of coordination and moving a water source around while potentially emptying the tank all over the place!
Once the siphon was going I could walk away and do something else until the water level was below the pipe in the tank, and of course everything would automatically stop.
So, new place has a cellar, which will be ideal to drop a pipe in to for water removal, and I am good at electronics, so the attached image is my solution:
*Waist is the drain with the option of storage for garden plant watering...
*Doser is a peristaltic pump to does with dechlorinate
the second unmarked sol valve is there as redundancy.
*Optional fill rate I wont bother with but if I do it would simply be two valves, with two ball valves set at two different flow rates. A combination allows for three fill rates to be achieved.
Out of interest, what would be the best solution for the upper valve to allow me to purge the pipe of water? It is designed to let air in so the pipe can be cleared of water without emptying the tank, but would ideally include a one way valve to prevent water escaping..
Any advice regards the plumbing will be appreciated!
Thanks,
Olly.