Pneumatic PWM Solenoid Valve
Pneumatic PWM Solenoid Valve
(OP)
I am looking for 1/4 " solenoid valves that are designed to be driven by a PWM signal. There are lots of Hydraulic valves avalable but the only Pneumatic I can find is Burkert. Looking for 2 and 3 way stainless good for 100 psi





RE: Pneumatic PWM Solenoid Valve
If you need a pulse width modulating solenoid valve, Danfoss Industrial Controls Division in Baltimore (410-931-8250) has that type of valve. But then you mention pneumatic? That's a different animal. Confusing. Asco is probably the largest solenoid valve supplier in the USA, you could try finding a distributor and ask them (ascovalve.com).
KevinF
RE: Pneumatic PWM Solenoid Valve
RE: Pneumatic PWM Solenoid Valve
Israelk - the former
RE: Pneumatic PWM Solenoid Valve
The advantage with such application using ON-OFF 3-way or two valves of 2-way to contol the pressure in a controlled volume is that the average pressure in the controlled volume is a function (S shaped like curve function) of the Duty Cycle only with no need for pressure sensor.
The frequency of the PWM will detemine the ripple size however, the higher the frequency the shorter the valve orifice seats life.
I have developed and designed such high frequencey valves for the last 25 years and have the analytical tools and knowledge to calculate and simulate the pneumatic time response of the control volume (constant and variable) and the electrical and mechanical time response of the valves.
However, pay attention to the fact that the forces on the valve plunger are function of the average pressure meanly, a function of the Duty Cycle. Therefore, the valve mechanical time delay (dead time from the command to open or close until it close or open the orifice) is not constant and will change with the Duty Cycle. This can make a difference at high frequency.
RE: Pneumatic PWM Solenoid Valve
I would come up with a way to get some feedback on this valve opening so you can calibrate out any error every day or there abouts (due temp variation, humidity, etc).
RE: Pneumatic PWM Solenoid Valve
RE: Pneumatic PWM Solenoid Valve
I was thinking of something else when I posted, my apologies if some of my comments are off base.
I dont think the valve would have to be any thing special. The solenoid design is probably more important. My experience is with hydraulic valves and pneumatic cylinders. I do believe the vendor (Eaton) had designs to be used for only DC (PWM) control. I think some generic valves can be controlled via PWM and on the other hand, I think some can not. I believe it all depends on the design. I hope this gives you some ideas.
RE: Pneumatic PWM Solenoid Valve
Ozols
RE: Pneumatic PWM Solenoid Valve
RE: Pneumatic PWM Solenoid Valve
RE: Pneumatic PWM Solenoid Valve