Careful with the terminology and how its used... A "flashback arrestor" is by nature a check valve.... And it does not stop the transfer of heat, it stops the reverse flow of gasses so they do not intermix and explode as a fame front travels back down hose (or torch body) ....
A "fire check" is constructed as a screen of porous materials that is dense enough the fuel gas (natural gas or propane) can flow through it at molecular level but a flame front can not pass through it.... And constructed differently then a check valve... And is generally used with natural gas supplies at levels local utility company supplies it at (pressure to low for gas pressure to open a "check valve" flashback arrestor)...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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