That will do just fine for operating these valves, and the amount of CO2 consumed cycling valves in a brewing session will not be very much.
As a high-level homebrewer, you probably already have a CO2 tank and regulator. You probably don’t need a compressor to provide the control pressure. It’s even possible to implement a variable throttling valve, by adjusting the air pressure somewhat lower than required for complete pinch-off.It’s just a straight-through length of tubing. Extremely low restriction when fully open.Pneumatic control valves can be had for $30. The air pressure can be controlled by a much smaller and less expensive solenoid valve.The valve will seal even if the fluid has solid particles in it (as the first runnings from a recirculating mash are likely to have.).This type of valve is used in many industrial processes, especially where the fluid may be a slurry containing solid particles, such as in mining operations or sewage treatment plants. If the control pressure is high enough, it will squeeze the flexible tubing shut, and pinch off the flow of the fluid. The idea here is that the fluid is carried through a length of flexible tubing, and that flexible tubing is run through a rigid jacket that can be pressurized with air (or another gas or fluid). I have since attempted another approach: a pneumatic pinch valve. That attempt was a failure, not even able to seal against 5psi pressure. In a previous post, I wrote about an experiment at building a solenoid pinch-valve, as an inexpensive alternative to the exorbitantly-priced solenoid valves commonly used in automated homebrewing systems.
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