First off I'm assuming that you're talking about an add on by-pass block rather than the valve used on the Super C etc to control the fast hitch cylinder.
The plate I believe you are referring to does not contain any valving and does provide a place to hook at least one hose into. HOWEVER that's not all it does. It is really a diverter plate.
In the factory setup for a C, the hydraulic fluid flows from the touch control to the pump, and from the pump back to the touch control. No pressure is developed until the touch control is operated and then it only develops what is required.
When you add in the bypass block instead of the oil returning directly from the pump to the touch control it now passes through your added OPEN CENTER hydraulic valve. This means that you new valve is upsteam of the touch control and when you operate it pressure will be developed (pressure is simply resistance to flow) until it is sufficient to operate the funtion you have selected.
If you didn't have the bypass block and you operated your hydraulic valve nothing would happen as no pressure would be developed because the fluid would take the path of least resistance and return directly to the touch control.
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Today's Featured Article - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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