G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
G05D7/00—Control of flow
G05D7/01—Control of flow without auxiliary power
G05D7/0146—Control of flow without auxiliary power the in-line sensing element being a piston or float without flexible member or spring
G05D7/016—Control of flow without auxiliary power the in-line sensing element being a piston or float without flexible member or spring the sensing element being a ball
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