Abstract: A sight glass and sampling system for the output of a liquid processing device. The system includes a sight glass connected to the outlet of a liquid processing device. A first three-way valve controls the flow from the outlet of the liquid processing device to the inlet of the sight glass. A second three-way valve controls the outlet from the sight glass. A valve controlled sample conduit is connected between the first and second three-way valves. A bypass conduit connects the first and second three-way valves and is controlled by these valves.

Abstract: An edible high-protein flour is produced by an improved process. Cottonseed meats are dried, and then comminuted in a combination of mills having certain specifications which prevent rupturing the pigment glands of the cottonseed. Recycling of partially ground meats is practiced. This improvement is correlated with liquid cyclone separation followed by oil and solids recovery steps, thus comprising an improved process which consistently yields an edible cottonseed protein concentrate and high grade cottonseed oil.