Abstract: A multifunctional valve device includes a valve body and a plug mounted in the valve body. A partitioning wall separates an interior of the valve body into two chambers respectively communicated with an inlet and an outlet. The partitioning wall includes a hole communicating the first chamber with the second chamber. A seat is coupled in a coupling hole of the valve body and includes a screw hole for threadedly engaging with the operative rod. The operative rod includes a first end abutting against the plug and a second end outside the valve body for manual operation. A spring biases the plug to seal the hole of the valve body. The multifunctional valve may act as a stop valve, a limiting valve, and a check valve, depending on the position of the operative rod relative to the plug seat.