The backflushing is considered as an important part of the maintenance of the espresso machines. The overall process of the backflushing can force the water and the cleaner back to the system over the pressure valve to be able to remove out those build up and to keep the valve right in its good working condition or order.
The backflushing needs to be factored into a regular cleaning session for that of the expresso machine, typically in the home setting a backflush that is without any cleaning of the chemical which needs to be done once per week. In every 200 shots of the coffee, a thorough cleaning needs to be done with the proper Espresso machine cleaning tablets. You'll want to know how often to backflush espresso machine.
If you will be based in the commercial setting, then most probably the backflush using that of the cleaner must be performed at least once at the end of the business day, you can pick to backflush during that of the day without any chemicals depending to that of the volumes.
Not all of that of the Espresso machine is actually capable of the backflushed that is why it is important that you will know if the machine has the ability before you will try it out. The espresso machines needs to be rightly fitted with that of the 3-way over pressure valve in order to be able to backflush. There are also a lot of entry level machines that are not properly fitted with these one and you often need to move right into the high end home espresso machines in order for you to get this kind of feature, check that of the manual or with that of the manufacturer if ever that you are not sure about the certain machine. Do check out COFFEETOOL Grouphead brush options.
The reason why there is valve is to be able to limit the pump pressure that the machine will apply during the extraction. This can also remove the excess pressure and that of the moisture at the very end of the shot helping to avoid that soupy puck making it very easy to be removed from the portafilter.
The overall process of backflush is very important and fundamental for all of the machines, but the exact process will actually vary on every machine. Make sure that you are to refer to the operating manual for the exact kind of process. Make it sure that the coffee machine is being powered by the brewing temperature. Try to also check the total amount of water and then fill them with the fresh filtered water if possible. Here's how to backwash and clean a coffee machine: https://youtu.be/KEzUmtlog-c