Which part of a gas regulator directly responds to changes in outlet pressure?
The diaphragm inside the regulator
A gas pressure regulator must sense the outlet pressure and adjust the valve opening to hold that pressure steady.
The flexible diaphragm inside the regulator is exposed to the outlet gas, so it flexes in response to any change in outlet pressure.
This diaphragm movement acts against a spring and repositions the valve to restore the set outlet pressure.
The inlet connection, the pressure gauge, and the rigid body do not move with outlet pressure, so they cannot perform this sensing action.
Hence, the answer is The diaphragm inside the regulator.
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