I hesitate to try to describe how your system should work as I don't know exactly what components you have or how they are connected. Here is some general description of how they were often done.
Normal high pressure flow from the hydraulic pump is through the smaller of the 2 manifold tubes into the main Touch-Control block. When an adapter (or diverter) block is added, it fits between the Touch-Control block and the fitting on the end of the manifold. This block has straight through holes everywhere except at the high pressure flow. In this position, there is an L shaped passage that goes in the side of the adapter and into the Touch-Control block. It blocks flow from the manifold. A hose is attached in place of the high pressure plug in the fitting on the end of the manifold. This hose provides flow to any external valves/attachments. The return from the external valves goes back into the port on the side of the adapter. Flow into the adapter then goes to the built-in valves of the Touch Control. The external valve needs to have pressure relief done one way or another. If a hose is connected directly from the high pressure of the manifold into the side of the adapter, the whole system works the same as without the adpater.
The simplest extenal attachment would be a single 1-way or 2-way valve with pressure relief that dumps into its outlet port. Some slightly more complex valves have a "power beyond" outlet that passes high pressure flow only when the valve is in neutral, which would be connected to the adapter. There is a second outlet port that gets the return flow from the cylinder and the pressure relief valve. This would be connected directly to the reservoir.
BY the way, we talk about 1-way and 2-way cylinders. The hydraulic people talk of the valves for each of these as 3-way and 4-way (the number of hose ports on the valve).
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