Solenoid Valve Operation 2
There are two types of construction available; Direct-Acting and Internal Pilot Operated.
Direct-Acting Solenoid Operators and Valves - 2500, 2510, 3800, 3822, 3823, 3824, 3825, 3900, 3923, 4000, 4100, 4200, 4280
With a direct-acting valve, the solenoid plunger directly opens or closes the orifice, and the sealing disc is attached to the plunger. In the case of a normally closed solenoid operator or valve, the orifice is closed when de-energized. In the energized condition, the orifice is open. The valve will operate from zero (0) psi (pounds per square inch) to its maximum rated pressure. In the case when the operator or valve is normally open, the orifice is open when de-energized. When energized, the orifice is closed. The valve begins at its maximum rated pressure and is operated to close flow or zero (0) psi.
Direct-Acting 2-way solenoid valves are shut-off valves with one valve inlet and one valve outlet port.
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Direct-Acting 3-way solenoid valves have three port connections and two orifices. One orifice is always open and the other closed. When the valve is energized, the mode reverses, hence the description 2 position. Figure 3 shows a 3-way, 2 position normally closed valve. With the coil de-energized, the plunger main spring tension holds the lower seating disc tightly against the lower orifice, and shuts off flow. Port A is exhausted through Port R. When the coil is energized, the plunger is pulled in and the orifice at Port R is sealed off by the spring-loaded upper seat disc. The fluid media now flows from Port P to Port A.
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