Vì vậy, sự thay đổi áp suất bên trong chai có rất ít ảnh hưởng đến buồng áp suất điều chỉnh. Sự khác biệt thực tế giữa các giai đoạn một và hai xuất phát từ bản chất của propane, bởi vì nó không phải là một chất khí, nó hoàn hảo là một hơi. Điều đó có nghĩa là nó không có mật độ hoàn toàn thống nhất, và điều này có thể gây ra biến động trong bếp. | Gas Burners 4 slot is not recommended over the threaded hole option because of the longer length of the flared choke. This keeps the choke sleeve mounted thumbscrew well away from the air intakes. To place the thumbscrew on the choke sleeve measure 3 8-inch from the sleeve s forward edge and place a 1 4 X 20 threaded hole. Follow the directions given in Step 5 of Chapter 3 if you choose to use a slot. 6. Laying out the air openings part 2 Lay out four equidistant longitudinal lines on the pipe use the same methods in Step 6 of Chapter 3. These are the center lines for the air openings. Mark a line at the lip of the bell reducer then mark five more lines at 1 2-inch intervals creating a total of six lines around the pipe. Use the same methods as outlined in Chapter 3 to transfer the lines around the pipe s circumference. Scribe parallel lines down the pipe from the end marks through the circular marks. Punchmark all the intersections of lines with four rows of punch marks six marks to a row. Since the bell reducer will cover the back half of the first hole the air openings are 2 3 4-inch long. To use the grinding method and layout to chain drill 1 8-inch pilot holes across the forward end of the openings. The air intakes will then end up about 2 5 8-inch long which is fine. This method requires additional longitudinal lines to be laid out at 1 4-inch on either side of each center line see Fig. 7-3 . 7. Cutting the air openings Review the directions of the same in Chapter 3. Drill a 5 32-inch pilot hole in each mark and enlarge all the holes to 1 2-inch. Use the right angle grinder to remove most of the metal left between the holes and finish smoothing the sides of the air slots with a flat file. Finish Step 7 according to the instructions in Chapter 3. Remember to bevel front and back edges of the air intakes the same that is shown in the advanced version of the hand torch. A forty-five degree bevel and a longer bevel area gives better performance. The forward .
