| 摘要 |
A proportional pressure adjusting valve with two main valves and two diaphragms, of which the two diaphragms of different sizes are lapped one over the other to act on each other and to control a second main valve, the smaller diaphragm and the second main valve connected with it are used to sense the change of pressure at a gas outlet to automatically adjust the size of a gas inlet; the amount of gas received by an aeration chamber of the larger diaphragm controls the force of a spring being compressed between the larger and the smaller diaphragms, so that a flow able to proportionally and automatically adjust can be obtained to firstly kindle up a mother fire, then to make kindling of a main fire, thereby to delay shutting of the mother fire.
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