Grohe Toilet Cistern Abrupt Shutoff

[techweb]

I have purchased 2 x GROHE Flushing Cistern Solo 0.82 M 38691000

I am pleased with them for the most part and they replace existing Grohe cisterns that were in place for 14 years prior. However, these new ones appear to shut off the water supply very quickly after filling. Whilst the rapid shutoff does not cause our pipes to bang, I wonder if the abrupt shut off may cause issues further down the line. Is there a way to adjust the shut off so it does so more gradually? I have attached a video.

Thanks in advance.

 

[techweb]

Just realised my video may not work, uploading another. Thanks.

 

[techweb]

I have Grohe coming out tomorrow to investigate this under warranty. I will post an update. I was keen to know however whether other plumbers deem this to be an issue or not.

 

[Rtplumb]

I’m wondering if the float arm is sticking on the way back up then suddenly coming free and closing with a bang.

 

[techweb]

Engineer from Grohe came and said this is perfectly normal. Apparently the way in which they shut off is instant and it isn't going to cause any problems.