Valve Servo for FRANK Plastic Brine Distributor Type 2061/2062

Purpose

I have a Brine Distributor Type 2061/2062 from FRANK GmbH. It's made out of plastics and uses some non-standard valve handles. I use the brine distributor to choose between different heat sources for my heat pump, among them an air/brine heat exchanger (used during day) and a thermal buffer tank heated by solar thermal collectors (used during night). Long story short, I want to automate these valves. I checked with FRANK, but there doesn't seem to be a valve servo available, so I made own…

Background

A valve servo basically drives the valve handle. The motor (separate model published) is directly mounted on the valve axle. Two micro switches (separate model published) define the limits of movement. At the end they “click” and switch off the motor.

Gear Assembly

A normal hydraulic valve has 90° deg of movement, the FRANK valve has almost 720°C deg. The first gear reduces this by 10:30 down to 240° deg. The second gear reduces this by 10:30 down to 80° deg. The second gear has the limiter on it that turns into the micro switches.

Electrical Wiring

The space in the bottom compartment is meant for electrical wiring. In the center there are clamps that holds three Wago 221 connectors with cables pointing to the front. The electric circuit diagram shows the wiring.

Direction of Open/Close

Looking from top, the valve axle and the gear with the limiter turn the same direction. If they turn clockwise, the valve closes until the left switch clicks. If they turn counter-clockwise, the valve opens until the right switch clicks. Therefore the cable going to left (brown) is for closing the valve. The cable going to right (black) is for opening the valve.

Further Information

I'll add further information on request, e.g. more pictures of assembly, assembly instruction, …

I use a Technische Alternative UVR16x2 as control system. I can eventually add the programming as well. This is work in progress, especially getting it tested throughout all seasons.