Some Blackstone owners have expressed concern about the stock valve setup, so here are alternatives to consider.
I replaced the stock valve with a needle valve commonly used with SP10 burners used in home brew setups. The result has been reliable leak-free for several months and offers exceptionally fine flame adjustment, but it is “not for everybody”. Besides the parts cost of $35, the job takes a moderate amount of skill and places liability on the undertaker. (Yep, that is a play on words, but it really means you.)
The first picture, “ExistingValve”, shows what the internals look like after the rivets are drilled out on the stainless steel front cover. You are replacing everything inside the black box except the burner, labeled 1, in the photo. The replacement part is shown in “BlackstoneRetrofit” along with dimensions. Ignore the larger bull-nose fitting on the bottom as stock valve comes with 3/8" which is likely better anyway (see below). You can source the parts wherever, but I bought them at Tejassmokers.com from a very helpful chap named Cheyenne (Ph: 713-222-0077).
The good news is that if you get the length dimensions right, the entire valve assembly just screws right into the already-threaded Blackstone burner and the only thing sticking outside the stainless cover is the control knob. The control knob has a hex nut on the shaft that fits nicely into the stainless front cover so the valve is well-supported at both ends (i.e. screwed into the burner and snug in the stainless).
You can see in the photo “ValveTestFit” that I “hogged” out the metal box to insert a standard yellow gas line (1/2” for gas range). Although this setup has been working fine for several months, per Cheyenne, it is not rated for 10 psi, so when I get back from travels, I'll be switching out the yellow gas line for a braided 3/8” line and fitting.
AFIK the only two Blackstone owners that have made this modification are Larry (thezaman) and me. Larry wanted “all the love” that the Blackstone burner could muster so he replaced his 10psi regulator with a 30psi regulator for special effects on short bakes. I have an underground propane tank regulated to 10psi, so the after the flow loss in the retrofit valve, the flame looks like ~7.5psi regulator.
An alternative retrofit, for those interested, is shown in “SP10 Regulator+Valve”. In this setup a small in-line valve is used just after the red regulator which flows through a 90 degree fitting directly into the burner.
As always, improvements are welcome.