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this is whats happening, im not sure of terminology sorry

Its the internals, as you unscrew the valve head and turn it upside down the first thing i see is that the plastic is yellow and crumbles.

I've had an idea! Could i fit an isolating valve when they fail and turn that on/off or have some control. I am assuming they are very hard wearing compared to a bit of plastic

Good morning, I have a question about TRV's in general but mine are specifically drayton TRV4 Mine seem to keep falling, I bought drayton trv4's (7 in total) one failed within a year, another failed after about 3 years, and so on.. I bought these expecting a much larger lifespan. The plastic...