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G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
G05D7/00—Control of flow
G05D7/01—Control of flow without auxiliary power
G05D7/0126—Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs
G05D7/0133—Control of flow without auxiliary power the sensing element being a piston or plunger associated with one or more springs within the flow-path