Control of flow

GPHYSICS G05Controlling systems G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

G05D7/00Control of flow

G05D7/005characterised by the use of auxiliary non-electric power combined with the use of electric means G05D7/01without auxiliary power G05D7/0106the sensing element being a flexible member G05D7/0113the sensing element acting as a valve G05D7/012the sensing element being deformable and acting as a valve G05D7/0126the sensing element being a piston or plunger associated with one or more springs G05D7/0133within the flow-path G05D7/014using sliding elements G05D7/0146the in-line sensing element being a piston or float without flexible member or spring G05D7/0153using slidable elements G05D7/016the sensing element being a ball G05D7/0166the sensing element being a float or a ball placed outside the flow path to be controlled G05D7/0173using pivoting sensing element acting as a valve mounted within the flow-path G05D7/018using rotary sensing element G05D7/0186without moving parts G05D7/0193using hydraulic or pneumatic amplifiers, relays or transmitters G05D7/03with auxiliary non-electric power G05D7/06characterised by the use of electric means G05D7/0605specially adapted for solid materials G05D7/0611characterised by the set value given to the control element G05D7/0617specially adapted for fluid materials G05D7/0623characterised by the set value given to the control element G05D7/0629characterised by the type of regulator means G05D7/0635by action on throttling means G05D7/0641using a plurality of throttling means G05D7/0647the plurality of throttling means being arranged in series G05D7/0652the plurality of throttling means being arranged in parallel G05D7/0658the plurality of throttling means being arranged for the control of a single flow from a plurality of converging flows G05D7/0664the plurality of throttling means being arranged for the control of a plurality of diverging flows from a single flow G05D7/067characterised by free surface flow G05D7/0676by action on flow sources G05D7/0682using a plurality of flow sources G05D7/0688by combined action on throttling means and flow sources G05D7/0694by action on throttling means or flow sources of very small size