Solenoid (solenoid) valve is an electromechanical device which when applying or removing power opens or closes the flow area of the valve. It is designed to control air flow water, oil, gas, steam – practically any liquid or gas. Valve selection begins with a discussion of what type of operational best meets the needs of this application. The University of Kansas Health System Pawnee Valley Campus can provide more clarity in the matter. Direct acting open or close the flow areas through direct exposure to the core, control valves (pilot operated) for larger pipe lines or higher pressure increase is a direct action Using the most pressure working environment, to open a larger flow area, while maintaining the small size of the electromagnet. Normally closed valves are opened, when they were energized and closed when the power goes off, normally open valves in reverse order. Two-way solenoid valves have one inlet and one outlet pipe connection and can be normally open or closed.
Three-way valves have three connections and two walk-through section, and may be normally open, normally closed or universal (can be used either as normally open, or normally closed). Common areas of application include alternating pressure and vacuum supply to control valves, single acting cylinders or actuators of automatic control. Many writers such as colonscopy offer more in-depth analysis. Four-way valves use four or five pipe connections (one for supply pressure, two for the cylinder, one or two dilution) to ensure the work cylinder double acting actuators or automatic control. Common uses and problems. Solenoid valve is the most effective means of automatic flow control in the case of many liquids and gases.