1. Mac Solenoid Valve Pdf
2. Proportional Control Valves
3. Proportional Valve Controller
4. Proportional Solenoid Valve Driver For Macbook Pro

PVQ series, compact proportional solenoid valve, was designed by SMC with a direct poppet construction. This construction enables low leakage, while de-energized.

HydraForce 4000136 Proportional Valve Driver With Solenoid, New See more like this SAUER DANFOSS PVEH 120 PROPORTIONAL VALVE SOLENOID COILS 155g4092 New (Other). ASCO is an innovation leader in pneumatics and motion control. Our Numatics product line has a history of technological breakthroughs. It offers a broad range of 2-, 3-, and 4-way air-piloted and solenoid-operated directional control valves with fieldbus and I/O capabilities. Proportional Amplifiers and Ancillary Products Sun Hydraulics Technical Tips Sun Amplifiers, Hand Held Controllers, Set-up Procedures. Proportional valve amplifiers are devices that interpret an analog command and control electrical power to a proportional solenoid coil. This scenario is shown graphically in Figure 1.

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I am looking to drive a current regulated proportional (solenoid) valve that needs up to 85mA @ 24V from a microcontroller.

So far I found this circuit that looks pretty straightforward:

What are other low cost options? Is there such a thing as a programmable current source that I can drive through SPI or I2C? So far I wasn't able to find one.

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The iDP Series of aggressive media solenoid valves has expanded. The diaphragm isolated 390 series 2-port proportional valve delivers a variable output flow of aggressive chemicals and cleaning fluids from a corresponding variable input current to its solenoid. For PFV proportional solenoid valves with onboard linear drive electronics, three different command inputs (05V, 010V or 020mA) and two different power.

3 Answers

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I would drive the valve by PWM with a low side switch. All you need is the transistor and the flyback catch diode. The solenoid coil has significant inductance, so will smooth out the current on its own. I'd stay above the audible range, but most likely the solenoid will 'see' only the average well below that frequency. At 25 kHz PWM frequency, for example, you get 40 µS per pulse. That is quite a long time for a modern microcontroller, so you will have plenty of resolution and lots of cycles to compute how long the next pulse should be.

At your voltage and current, you can use something like the IRLML0030 as the low side switch and directly drive it from a digital PWM output of the microcontroller. Don't forget the reverse diode across the coil. A Shottky would be good. 30 V 1 A Shottkys in SMA packages are plentiful and cheap.

You say you want to control the current, but is that really just a internal parameter of a larger control system? For example, are you really trying to control pressure, flow rate, or something else? If the solenoid drive is inside a larger feedback loop, then you can just make the PWM duty cycle proportional to the signal. It won't be completely linear, but plenty close enough for the outer feedback loop to work with and eventually control the desired parameter correctly.

Mac Solenoid Valve Pdf

I actually did exactly that once in a real commercial product that controlled the pressure on the output of the valve. I did compensate the duty cycle based on the measured power voltage, since that could vary widely in my case. That means the outer control loop computes the desired solenoid drive level, and the low level code computed the PWM duty cycle from the desired drive level and the actual supply voltage.

A8n-sli driver for mac. ASUS AI NET2 remotely detects cable connection the second you turn on the system, and any faulty connections are reported back up to meters at 1 meter accuracy. What this does is allow larger third party cooling solutions to be installed on the videocards, or even a water cooling apparatus.

Proportional Control Valves

Olin LathropOlin Lathrop$endgroup$$begingroup$

Well, why not make it yourself? Implement this:

Connect PWM with LPF or DAC to voltage input, and You're good to go. To make it robust You can connect feedback to ADC and implement PID driver, so output will be exactly what You desire. It is easy as a pie, first simulate it with LTspice to check ranges and stuff. You don't need to use expensive IC as well, you can go for low frequency high voltage OPAMPS and single 2n7002 fet driven directly from OPAMP.

edit2: WOA? Why do you need such a great mosfet? Is it rated for 80A not mA. Go for small ones, they have way smaller gate capacitance.

Nick Alexeev♦$endgroup$$begingroup$

it depends on how you wish to drive the valve. as mentioned by others, pwm is the most efficient approach. But your particular valve will determine the best way to drive.

the output current follows this approach:

Proportional Valve Controller

(1 + 3R/1R) * I * 1R = Vdac_out.

so you can work out the math for 165ma drive.

Proportional Solenoid Valve Driver For Macbook Pro

dannyfdannyf$endgroup$

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