Abstract: A valve device includes a shell, a primary valve, a check valve, a stop, and a spring. The shell includes an inlet, an outlet, and at least one flange including a cavity in communication with the outlet. The check valve is movably located in the cavity. The check valve includes a stem formed on a side. The stop is located in the cavity so that a gap is defined between the stop and the wall of the cavity. The spring is compressed between the check valve and the stop. The spring includes an end located around the stem of the check valve.