You're right in that it only prevents catastrophies that would have
occured while not washing and only if I remember to turn it off. A
battery operated alarm connected to the laundry room door closure and
valve would be a simple failsafe reminder.


actually not true. most failures are burst hoses. minimizing time they
are pressurized by auto valve should help prevent a disaster all the
time.... less wear on hoses

deally a electric valve that turns water off when washer isnt in use
PLUS turns water off at any time if a leak is detected.

Your concern appears to be a auto valve damaged by a power surge.....

add surge protection to your main breaker cabinet and make certain
everything is well grounded.

a serious power surge can cause way more damage than being unable to do
laundry, most folks have a ew days worth of extra clothes, time enough
if your out of town for a plumber visit...... or laundrymat. or phone
directions for wife