The working principle of High Pressure Solenoid Valve

• Posted by xinsheng yuyao August 23, 2021 - Filed in Other - #Acrylic Flow Meter，High Pressure Solenoid Valve  - 794 views

   

  　　The working principle of High-Pressure Solenoid Valve.

  　　In principle, a variable DC voltage can be used to proportionally control the plunger, but in fact, the static friction on the plunger guide point will damage the sensitivity of the valve, resulting in a greater hysteresis effect (physical value properties lag behind the change in the effect that caused it). In order to prevent static friction, special control electronics can be used to convert the normal inlet signal into a pulse width modulated voltage signal (PWM).

  　　Pulse width modulation (PWM) is a technique often used to control the power supplied to electrical equipment. The average value of the voltage (and current) fed into the solenoid is controlled by quickly turning on and off the power switch. This control causes the plunger to enter a very fast but weaker oscillation. Swing makes the plunger in a balanced state, thereby maintaining its constant sliding friction. The oscillating motion of the plunger has no effect on the fluid flow behavior.

  　　Compared with the off-time, the longer the switch is on, the higher the total power supplied to the solenoid. The term duty cycle describes the ratio of the "on" time t1 to the period duration T. A low duty cycle corresponds to low power, as it is off most of the time. The duty cycle is expressed as a percentage, and 100% means fully open.

  　　In the High-Pressure Solenoid Valve, when zero current is fed to the coil, the spring pushes the plunger down to the fully closed position, so the valve remains closed. Applying current to the coil generates a magnetic field, which causes the plunger to move upward against the return spring. At 100% duty cycle, the solenoid valve is fully powered and the valve remains open. The duty cycle in the range of 0 to 100% changes the valve flow proportionally. For example, providing a solenoid with a 50% duty cycle moves the spring and plunger to 50% of the working range.

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