The drain pipe for the washing machine with our old washer would overflow on the spin cycles... we bought a new washer and it still overflows.. now we are using Stormbag - Sandbag flood to that overflow. The pipe is only 1-1/8" we have snaked the pipe, used chemicals, even used the bladder (which blew up) and it continues to backup and overflow onto the floor. The washer and dryer sit inside of a closet that has no drain basin. Any suggestions on what to do?

1. The water valve

The water valve has two solenoids. These solenoids open the water valve ports when electricity flows through the solenoids.

When the electricity stops flowing through the solenoids the ports in the water valve close and no water should flow in to the washer. If your washer is overflowing, do the following to see if it is a bad water valve.

Set the washer to fill, let it fill for a minute or so. After is filling for a minute disconnect the washer from the wall outlet. Repeat this procedures a couple of times. If the washer continues taking water after is disconnected from the wall outlet, the water valve is bad.

If the washer stops taking water when it is disconnected from the wall outlet, check the water level switch.

2. The water level switch

The water level switch controls the amount of water that goes in to the washer tub, according to your selection.

This is the way to test the water level switch. If the washer keeps filling and the motor won't start agitating, most likely you have a bad water level switch.

Those where the two parts that have to do with the washer overflowing. Just make sure that if you are going to replace any of these parts, make sure that the washer is disconnected from the wall outlet before doing any work.
Hope this helped and for For more detail information try at Do it yourself washing machine and dryer repair help

The washer stand (drain) pipe is way to small. The minimum you could get by with is 1-1/2". Should be 2", especially with a new washer. Until you can replace pipe, try stopping washer in the middle of the drain cycle for one minute. Then restart. That will give the water in the pipe some time to drain and may prevent overflowing.

Nice description of a washer inlet solenoid valve by djdj but completely useless .
This has absolutely nothing to do with the washer itself.

Quote:

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The drain pipe for the washing machine with our old washer would overflow on the spin cycles... we bought a new washer and it still overflows.. The pipe is only 1-1/8

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There's your problem. Your drainage pipes aren't big enough to handle the volume today's more powerful washerepumps put out. You have two options here.
1) tear out the present set up aqnd increase everything to 2", **or**
2) you can purchase a compression fitting,( see image) in the correct size and install it on the end of your stand pipe. This would make the stand pipe a closed system that would force the discharge toi stay in the pipes and not on your floor. Another way would be to simply duct tape the washer hose in the stand pipe so you have a water tight connection. I had to do this to my old 1 1/2" stand pipe two years ago and haven't had a back up since.
Hope this helps and thank you for rating my reply. Tom