"Steuereinrichtung" - C-Stoff Control Valve
The Major Component Parts of the Walter 109-509 Series Motors

C-Stoff propellant pumped to the combustion chamber, is controlled by the main pilot's throttle lever, which opens a rotating barrel, turning in a fixed sleeve.

The central barrel is made from hardened steel. It is hollow for part of its length, and has three sets of ports in it, which correspond to a similar set of ports in the fixed sleeve which surrounds it. The sleeve is brass. One end of the central barrel is connected to a mechanical linkage which passes directly to the pilot's throttle control in the cockpit.

The body of the valve has channels machined in it, which are connected to outlet pipes, that carry the propellant to the combustion chamber. The C-Stoff pipes are of varying diameters, which correspond to the volume of propellant required to operate the first, second and third stage thrust settings of the motor. Orifice plates fitted in the outlets constitute an additional means of controlling the amount of propellant delivered to the burners, and by altering their diameters, the ratio of C-Stoff to T-Stoff can be varied.

For each stage, a small lead-in groove is machined in the delivery port of the rotating barrel, to prime the line with a small flow, before the stage comes into full operation.

As the pilot opens the throttle, for the first thirteen degrees of rotation, there is no port opening, but as the pilot increases the movement, the first, second and then third stage ports are revealed. A mechanical link connects the lever operating the propellant control valve also to the steam control valve.

In the solid section of the rotating barrel, nearest the operating lever, are cut a series of milled grooves, corresponding with small ports in the brass sleeve.

If the throttle valve is opened more than 13^o, the slots milled into the barrel connect two of these channels together, allowing C-Stoff at pressure down onto the top of the shut-off valve operating piston. (For more information about the shut-off valves, see the page about the Fuel Flow Regulating Valve.) The piston is forced down, allowing the propellants to flow past the shut-off valves, into the motor system proper. Connected to this channel is a small diameter pipe which leads to the combustion chamber dump valve. Thus, when the throttle valve is opened, the rise in propellant pressure in this line shuts the dump valve against atmosphere, allowing C-Stoff to flow around the combustion chamber cooling jacket.

When the rotary valve is closed below 13^o, the C-Stoff pressure line is closed and the pressure fluid is led away from the top of the shut-off valve piston to the underside and away to drain.

To prevent an excessive end thrust on the rotary C-Stoff Fuel Control Valve, there is a bleed hole between the centre and the end face of the barrel. This allows C-Stoff at pressure to pass to both sides of the barrel, equalising the pressure on each side. A graphite-asbestos string seal prevents any balancing propellant leaking along the operating shaft.

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