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...valves
that use their own water pressure to help themselves turn on/off have been
around a long time. It involves a diaphragm with relatively large area that
is connected to the actual water valve. Water can be admitted or released
from one side of the diaphragm with a very small valve that does not involve
much energy, and the diaphragm effectively uses its large area to generate
sufficient force to open/close the main valve. This type of actuator is
already present in [...] regulators on
compressed gas cylinders.
Michael D. Edmiston, Ph.D.