The heart of the valve is a rigid tube within a sleeve. It would not do to have a sticky valve when the temperature changes. Semetrical ports are cut in the sleeve. A band of holes are cut in the tube. The gas flows in the space inside the tube to connect the opened ports.
Manifolds guide the gas to and from the ports and fittings.
The tubing may be magnetic. This allows the actuator coils to act directly on the tube. Alternately, the tubing may have voice coils wound on it. The voice coil end of the tube would extend inside a magnet assembly. The control interface is two wires to drive the coil.