Cast iron German standard globe valve is a valve that relies on the movement of the valve disc on the valve seat to control fluid flow. Its working principle is to adjust the cross-sectional area of the flow channel by changing the distance between the valve disc and the valve seat through the linear motion of the valve disc along the center line of the valve seat, thus achieving control and cutoff of the flow rate.

An API Bellows-Sealed Globe Valve is a specialized type of globe valve that meets the requirements of the American Petroleum Institute (API) standards, commonly used in the oil, gas, and petrochemical industries. The primary feature of this valve is the metallic bellows seal, which ensures that the valve stem area is sealed effectively, preventing leakage of hazardous fluids or gases.