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Profile: Flow Valves International deals with the manufacture of flow control valves under the registered name Syntron®. Our valves are designed to permit the free flow of materials without binding, seizing or damaging them. Our valves are available in three series namely, FV series, SFV series and DFV series. The FV series control valves operate by rotating the control handle through a 180-degree arc to vary the size of the aperture from closed to fully open position. To lock the valve in a selected position, the control handle has to be turned clockwise and tightened. It has features such as single sleeve and twist lock handle. Our SFV series control valves have a single sleeve & a trigger-type handle that locks in multiple precise aperture settings for rapid & frequent opening and closing. All models, except the SFV-12 and SFV-15, include five aperture notch settings.