no
YUP Just make sure there is an air gap in the washing machine
As long as there are working valves to shut off the hose at the washing machine connection, you do not need to shut off the main. If there are no valves there or they do not work, you must shut off the main before starting and then take advantage of this time to install shutoff valves as well.
if the valves have a place for a wrench to fit, usually they were threaded in. some plumbers still solder threaded valves & you can easily see the solder around the threads. If the outlet box is plastic, chances are they are threaded in.
Solenoids are used in Car Starters, Rail road as electric switch. They are also used as valves to control the flow of fluid in appliance like washing machine.
Veins, arteries or valves
The chordae tendinae are connected to the atrioventricular valves. These are the valves that separate the atrium from the ventricle on each side of the heart.
the valves are connected with the cams on the engine , the cams are rotated during the power stroke .
The papillary muscles and cusps of the heart valves.
The valves are anchored by the tendons. That way when the blood flows through them, they don't move.
push rods connected to the camshaft
A machine shop that rebuilds engines has equipment to regrind the valves and valve seats.
The atria and the ventricles are connected through the AV valves. The left and right sides of the heart are separated by the septum.