I believe that the general practice and thought is that the valve on the tank seals off only once it is open fully. Also in an emergency situation if you need to turn the tank off, if the tank if open full, you can only turn it one way, so no confusion. The other thing to think of is that you are using no more fuel with it open full than open partially because the amount of fuel used is regulated by the torch.
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Pam
"It is easier to perceive error than to find truth, for the former lies on the surface and is easily seen, while the latter lies in the depth, where few are willing to search for it." Johann Wolfgang Von Goeth
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