As shown in the picture, do the experts know what GF means again?
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What do GF and CL300 mean in the figure?
GF is the number of the gasket, right? DN20 is the size, and CL300 is the pressure rating – it can withstand 300 pounds of pressure
GF is likely the code for the gasket material; DN20 represents the nominal size, while CL300 corresponds to 300 pounds per standard in the US, which is equivalent to PN50
It seems to be GR; it looks like a graphite gasket
GF is the code for the gasket. DN20 diameter, CL300 standard, pressure of 300 pounds
The graphite of the gasket has worn out, so it’s not working well anymore
HG/T20630-2009: Metal-clad gaskets, page 381; filler material code: FG – flexible graphite sheet, maximum operating temperature of 650°C. HG/T20631-2009: Wound gaskets, page 398; filler material code: G.F. – flexible graphite strip, CL300. Someone upstairs has already explained this.