Is PTFE the answer?
Some components that have moving parts in contact with fluids have a weep hole to warn you that the seal/gland is on the way outView attachment 250082
I was intrigued that the middle bit of the Pressure Temperature Control Valve has got a tiny hole in the bottom, which is where you can see the drip coming from. That's obviously an 'intended' hole ... so what's it for I wonder?
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