Patent ID: 8851107

Claim:
A gas regulating mechanism, comprising: a body having a passage, an intake, and an outlet, the intake and outlet being connected to the passage; a first shutter disposed in the passage, the first shutter having a first shutter element and a first seat; a second shutter disposed in the passage downstream of the first shutter, the second shutter having a second shutter element and a second seat; and a mobile element defining with the body a low pressure chamber downstream of the first shutter and the second shutter, and linked to the second shutter element; a first spring in the low pressure chamber and acting on the mobile element for pushing the second shutter element toward the second seat in the direction of gas flow from the intake to the outlet, so as to close the passage, the low pressure chamber being configured such that the first spring surrounds the second shutter element and the second seat; wherein the mobile element controls the first shutter and the second shutter dependent upon the pressure within the low pressure chamber, the first shutter and the second shutter being mechanically connected so that the first shutter closes before the second shutter.