Piping: Single tile check valves (plus circuit gate)

[malventano]

With 0.15 changing the previously 1x1 tile pumps with a 2x1 tile version, the ability to use pumps as fluid switching devices (circuit network) becomes significantly more difficult in dense layouts. I think a simple 1x1 tile valve that can be circuit network connected would be helpful here. I propose a 1x1 check valve. It would act as a one-way valve on its own, but when connected to a circuit network, it can be configured to override closed or open, effectively turning it into a circuit network controlled gate valve. This would kill two items with one stone, and make for simpler porting of older maps previously using pumps as flow switches.

Thoughts?