Solenoid Valves Pavana Rupa Bondili ECE 5320 Mechatronics Assignment #1Solenoid ValvesSlide 3Slide 4What are actuators and where do we use them ?ActuatorsCan we see practical example where they are used ?Slide 8How do we select the actuator we need ?Slide 10Slide 11Interesting ! Can we know more about the types of Actuators ?Slide 13Slide 14How do they look in reality ?Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Which is the actuator we are interested in ?Slide 24Can you explain the principle of working for the Solenoid valves?Slide 26Slide 27Slide 28Slide 29Slide 30It would be more exciting if we could see the valve working ?Slide 32Do We have classifications in the Solenoid Valves ?Slide 34Slide 35Slide 36Slide 37Slide 38Slide 39Slide 40What should we look in for when we select a solenoid valve ?Slide 42Where are the Solenoid valves used ?Slide 44What do we conclude from this presentation ?Slide 46The End Thank you - Pavana Rupa BondiliSolenoid Valves Pavana Rupa Bondili ECE 5320 Mechatronics Assignment #1Solenoid ValvesReference listTo probe furtherTechnology OverviewActuators And Principle of OperationClassification of ActuatorsSolenoid Valves Working Principal of Solenoid ValvesClassification Of Solenoid ValvesApplicationsConclusionSolenoid ValvesReference List:Websites used for the survey of the study:http://en.wikipedia.org/http://www.globalspec.com/http://www.finecontrols.co.uk/solenoid_valves.htmSolenoid ValvesTo Probe Further :Recent Articles:Introduction to sensors and actuators By Professor Mark Bachman.“Solenoid Valves” By Dennis.What are actuators and where do we use them ?ActuatorsActuator: Actuators are devices used to produce action or motion. The input is generally electrical signal and output is linear or rotary motion. Actuators output can be position or rate i.e. linear displacement or velocity.(Taken together, sensors, actuators, controllers, and power supply form the basic elements of a control system.)Can we see practical example where they are used ?ActuatorsHow do we select the actuator we need ?ActuatorsSelection of actuator: Accuracy and resolutionPower required for actuationCost of actuation deviceDynamic responseActuators are used in many products of consumer, industrial, medical and millitary applications.ActuatorsInteresting ! Can we know more about the types of Actuators ?ActuatorsTypes of actuators:Electromagnetic actuators use magnetic fields to move components. Moderate force and displacements.Pneumatic actuators use air pressure to move components. High force. Moderate displacement.Hydraulic actuators use water pressure to move components. Highest forces. Moderate displacement.ActuatorsPiezoelectric actuators use electrostatic pressure of crystals to move components. Moderate forces. Small displacement.Thermal actuators use heat to move components.Small forces. Small displacement.How do they look in reality ?ActuatorsActuatorsActuatorsActuatorsActuatorsActuatorsActuatorsWhich is the actuator we are interested in ?Solenoid ValvesA valve is a mechanical device for controlling the flow of a fluid or a substance.A solenoid valve is an electromagnetic valve for use with liquid or gas controlled by running or stopping an electrical current through a solenoid, which is a coil of wire, thus changing the state of the valve.Can you explain the principle of working for the Solenoid valves?Solenoid ValvesThe operation of a solenoid valve is similar to that of a light switch, but typically controls the flow of air or water, whereas a light switch typically controls the flow of electricity.A solenoid valve has two main parts: the solenoid and the valve. The solenoid converts electrical energy into mechanical energy which, in turn, opens or closes the valve mechanically.Solenoid ValvesSolenoid valves may use metal seals or rubber seals, and may also have electrical interfaces to allow for easy control. A spring may be used to hold the valve opened or closed while the valve is not activated.Solenoid ValvesWhen current flows in the coil, magnetic field is generated and it reduces the air gap. Generally spring is used to create gap when coil is not energized. Small signal can operate solenoids. Large back emf is generated when coil is switched off. Diode is used to suppress the back emf and it prevents the control electronics from damage.Solenoid ValvesWorking Principle of Solenoids:Solenoid ValvesIn switched on mode diode is reverse biased During back emf diode is forward biased and conducts and creates the alternative path for the current.It would be more exciting if we could see the valve working ?Solenoid ValvesDo We have classifications in the Solenoid Valves ?Solenoid ValvesTypes of Solenoid Valves:Solenoid valves may have two or more ports: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.Solenoid ValvesA two-way valve has two ports.When power is applied, the pressure flows from one port to the other. With pressure off, the flow ceases.Solenoid ValvesA three-way valve has three ports.When power is on, one of the ports is connected to the common port, and pressure flows through to extend the pneumatic cylinder. When power is off, the other port is connected to the common port, and pressure is exhausted to reset the cylinder.Solenoid ValvesThis is the pneumatic equivalent of a single-pole single-throw electrical switch.Solenoid ValvesA four-way valve has four ports.With power on, one set of ports is connected straight through to the other set of ports. With power off, the connection is reversed.Solenoid ValvesIf a valve has more ports than you need, you can plug them up to get a lesser configuration.A four-way valve can act as a three-way by plugging one of the ports.Solenoid ValvesA three-way valve can act as a two-way by plugging one of the ports.What should we look in for when we select a solenoid valve ?Solenoid ValvesWhen selecting a solenoid valve:Coil voltage, current, AC or DC, and intermittant versus continuous duty. Valve typeAperture size Pressure rating, such as "50 PSI" Materials (medium) that it can control, such as "air/water"
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