Product review (5 stars): Fixed Samsung dryer
This fixed my Samsung model dv219agw/xaa.  Samsung only sells the coils as part of the whole valve assembly, but these were a match for me.  The symptoms are: starting cold, the gas fires and stays lit for a few minutes before shutting off, then the ignitor cycles every minute or so without firing the gas.  If you have the same symptoms, then save yourself a service call, get these, and find a youtube video for disassembling your model down to the gas valve.  On the Samsung, it's in the front right corner.  You remove the top, the control panel and bracket, the door, and then the front bulkhead.  You can leave the drum in place.

Posting this because I could find very little about this part specifically for a Samsung.  Hoping this helps someone else.