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DC Circuit Analysis and Basic Electronic Devices
Published in S. Bobby Rauf, Electrical Engineering for Non-Electrical Engineers, 2021
Application of a transistor in a typical “output module” of a PLC: A transistor can be applied as an “electronic switch” to execute a PLC microprocessor command in the field. This is illustrated in form of a transistor based PLC output, operating a solenoid valve, as shown in Figure 2.9. Applying ample positive bias to the left of R1 will turn “on” the npn transistor, causing a “short” to ground. This permits the current to flow through the solenoid coil. Flow of current through the solenoid coil generates magnetic flux through the core of the coil, thus applying magnetic force on the “plunger” or “pin” in the core of the solenoid coil. Depending on the design of the solenoid, the magnetic force can either open or close the solenoid valve.
Pneumatic Systems
Published in Anton H. Hehn, Fluid Power Troubleshooting, 1995
One of the common ways of operating a directional valve is with a solenoid. A solenoid is an electrical device which consists basically of a plunger and a wire coil. The coil is wound on a bobbin, which is then installed in a magnetic frame. The plunger is free to move inside the coil. When electric current passes through the coil of wire a magnetic field is generated. This magnetic field attracts the plunger and pulls it into the coil. As the plunger moves in, it can either cause a spool to move or seal off a surface, changing the flow condition. When the motion of the solenoid is directly coupled to the shifting mechanism of the valve, it is called a direct-operated solenoid valve.
Performance analysis and optimisation of lock valve for heavy-duty automatic transmission
Published in Australian Journal of Mechanical Engineering, 2023
Huaichao Wu, Zhao Peng, Limei Zhao, Lv Yang
SS1 solenoid valve is a normally closed-solenoidvalve (Bammesberger et al.2013). As shown in Figure 2, when the controller (Transmission Control Unit, TCU) does not transmit a pulse signal (EMP) to the SS1 solenoid valve (the SS1 solenoid valve is de-energised), the spool shaft pushes the steel ball to the right under the action of the spring preload, so that the control chambers of C1 lock valve and C2 lock valve are directly connected to the oil tank, realising the oil return of the two lock valve control chambers (Li et al.2014). And when the solenoid valve is energised, the spool shaft and steel ball move to the left under the action of electromagnetic force, hydraulic force and spring force to close the drain port. At this time, the control chamber of the C2 lock valve and the C1 lock valve enters oil.