To jerry-rig a 3-way valve to do 2-way operation? it seems to me that one would just need to disconnect the bypass leg and cap the open pipe connections. A bit depending on type of valve you have (ball valve, plug or other) and liquid. Be aware of 'sticking' problems and/or adequate torque if the liquid have a dry-stuff content that could gather at the blinded port or if the liquid crystallizes when drying. Normally, if the valve works well as a three-way, it should als work with a blocked port as two-way. It provides a handy place for sludge to accumulate, and might trap high pressure to provide a "surprise" when the valve is serviced, but it will act as a 2-way in most cases. Suggest you document that it is only temporary and keep a CYA file of who approved it.

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