PWM solenoid valves

[pokmo]

Hi

I'm trying to figure out how PWM solenoid valves work. Here's a disassembly I've found:

AFAIK, the unit on the right with a wire is a solenoid whereas the left is a valve body where the feed is at the top. The way I understand it is that the valve is controlled by a plunger in the solenoid. However, usually the plunger moves by no more than half an inch (

). If that's the case, how does the solenoid have enough reach to block the fluid from flowing toward the outlet?

Thanks

 

[njneer]

Normal solenoid is on / off
PWM ( Pulse Width Modulation) Works by pulses of on /off constantly hundreds of times a second keeping the valve open at a certain distance .
The quicker the pulses the further open it sits the slower the pulses the less it opens.
It’s a more efficient and controllable method of operating and uses less current and is more controllable for proportional functions over a range.
Modern strip lights work in a similar way , to the naked eye they are simply on but in reality they are switching on and off hundreds of times a second creating a specific frequency (HZ ) which is the number of time’s per second.

 

[pokmo]

Normal solenoid is on / off
PWM ( Pulse Width Modulation) Works by pulses of on /off constantly hundreds of times a second keeping the valve open at a certain distance .
The quicker the pulses the further open it sits the slower the pulses the less it opens.
It’s a more efficient and controllable method of operating and uses less current and is more controllable for proportional functions over a range.
Modern strip lights work in a similar way , to the naked eye they are simply on but in reality they are switching on and off hundreds of times a second creating a specific frequency (HZ ) which is the number of time’s per second.

Sure. I just don't quite get how the plunger is capable of shutting off the valve given the short travel distance. Do you know if the liquid supply go straight down in the valve or does it make a turn toward the solenoid? I wish there was an intersection view of the design of the valve.

 

[forblue]

Waveform is also changed from straight line to square section which can be moved closer together which alters frequency of the pulses as stated, which again means if used on a hyd valve, that can move small amounts, remember a pilot valve on any liquid can be used to move a much larger valve.

 

[e3120]

Sure. I just don't quite get how the plunger is capable of shutting off the valve given the short travel distance. Do you know if the liquid supply go straight down in the valve or does it make a turn toward the solenoid? I wish there was an intersection view of the design of the valve.

By the look of the image you posted, the solenoid valve screws on instead of the normal spring loaded diaphragm 'chemsaver'. If that's the case, the liquid does indeed make a turn towards the solenoid and short travel would be sufficient.