Abstract: A valve bonnet system including an emergency shut-off feature is presented. A bonnet can include a fluid inlet and a stopper inlet. A stopper member can be coupled with the stopper inlet, and engaging of the stopper member can effectively seal a channel of the fluid inlet to prevent the egress of liquid from a valve stem cavity of the valve through the fluid inlet channel. A stopper member can include a stopper, a gland nut, and a gland collar, and the stopper can be operated via a wrench head on the stopper. These principles can be applied to existing bonnets in the art with pre-existing fluid inlets, such that these bonnets can be improved to incorporate an emergency shut-off feature.