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Re: Automatic flushers



At 09:32 10/19/01 -0400, Michael Edmiston wrote:
...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.

There is something rather elegant about a single stage gas regulator
that can input gas at 2500 psi and provide a regulated output at an
adjustable 10 psi.

If you screw off the cap that holds the adjustment tee handle which
presses against the spring which opposes the diaphragm modulating
the high pressure port, nothing happens.

If you then remove the diaphragm which provides the pressure sensing,
nothing happens.

If you finally remove the actuating pin which connects the diaphragm
to the input port, still nothing happens - the high pressure gas
is cut off.

Give it a try!

There is something in this fail-safe/soft approach which is an object
lesson in how things should be arranged when the safety of life is
concerned.


brian whatcott <inet@intellisys.net> Altus OK
Eureka!