the screws hold the unit together, do not remove them with the water on. if you need to make sweat connections to the inlet you can take the unit apart so it doesnt heat up then reassemble after the solder cools. they have small orings so if you take it apart dont lose them
I haven't seen this exact type of valve before, but it looks like some type of mixing valve, made by Hansa. The screws look the same as the ones used on TMV,s I've serviced, which in those cases have been the filter and non return valve.
My girlfriend has one of the valves in her house but she says that when you wash in cold water the washer takes forever to fill up so she was wondering if it was possibly a water pressure adjustment screw.
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