A single hydraulic Foot Pedal is a mechanical foot valve commonly used to control certain functions in hydraulic systems, such as cutting off flow or changing flow direction. The basic working principle of a single foot valve is to control the opening and closing of the valve by stepping or releasing the foot pedal. When the foot pedal is pressed, the foot valve opens and allows liquid to flow through the valve; When the foot pedal is released, the valve closes, cutting off the flow of liquid.