Here is a nice little controller that I found for this purpose. Very easy to install and use.
There are many valves and meters to choose from. The SM6004 mentioned above by @mkosonen will work with it. I believe this company offers that same meter under a different part number. That's a nice...
@jpoder, there are 3-way valves that do offer what you need, but they are fairly uncommon. The reason is because you will need a 180 degree 3-position actuator. Most rotary actuators are only 90 degree or "quarter-turn" with only 2 positions. I believe they are available as special order (but...
tannnick, have you considered using angle valves in place of solenoid valves? the flow path is much larger on these. it is almost full port (pipe ID) when open. They do handle steam. These would require a compressed air system since they are pneumatically operated. You would be able to use your...
did you look at the 30D series from Assured Automation? They are stainless steel tri-clamp 3-way ball valves with a variety of actuators both electric and pneumatic. They are not cheap ($790 for a 1/2"), but they are the perfect solution for your application. There is also a more affordable...
Why the aversion to tri-clover? Butterfly valves typically don't come in NPT, but I do see a low cost PVC threaded butterfly valve here. Butterfly valves, due to their slim design typically use flanged connections - either wafer or lugged (see illustrations). OakBarn has suggested Tri-clamp to...
Yes, they are not cheap, but a lot of these are more industrial type valves better suited for commercial brewers where failure would be costly. The most inexpensive modulating actuator can be found on the SM series motorized ball valves, however they are not available to fit on butterfly valves...
Why reinvent the wheel? There are many valve actuators that are "Modulating" which means they control the degree of rotation of the valve stem on butterfly or ball valves. There is a good description of this here: Modulating Control Valves. Typically these are controlled by an input signal of 4...