I suggest you install an LPG vaporizer, which can force gasification of liquefied petroleum gas and also burn out the gas inside the cylinder every time.
Ningbo has a do this, called Ningbo Hongxi thermal equipment, there is a manager named Nie Shaohui. Specific contact information you search on Baidu to know, then you can install their own, they can also be installed, but I recommend that you let them to install it, after all, they are professional. Gas this thing or safety first, spend more money to buy a peace of mind!