API 623 CAST STEEL GLOBE VALVE

API standards for stop valves are mainly API 623 specifications, which are specifically used for the design, manufacture and testing of steel stop valves. This standard ensures the reliability and safety of valves under high pressure and high temperature conditions and is widely used in industrial fields such as oil and natural gas.

• High Pressure Loss: Flow control is achieved through the gap between the valve disc and seat, creating resistance and leading to significant pressure loss.

• Unidirectional Flow Design: Typically supports unidirectional flow only; using it in reverse flow conditions may damage the valve or cause operational issues.

• Low Flow Regulation Accuracy: The large contact area between the disc and seat makes it difficult to achieve precise flow control with slight disc movements, especially for small-range adjustments.

• Labor-Intensive Switching Operation: Large operating force is required, especially for larger diameters and high-pressure applications, to overcome the sealing friction between the disc and seat. In emergencies, it may respond slower than other types of valves.

API 623 is intended for larger steel globe valves, while API 602 is more suitable for small-diameter, high-pressure forged steel globe valves. They differ in structure and application, with API 623 being more appropriate for medium to large industrial pipelines.

The API 623 globe valve requires regular inspection of the valve seat and disc for wear, especially if frequently opened or used in corrosive media. Additionally, periodic lubrication of the valve stem helps extend its service life.

The API 623 globe valve is typically designed for unidirectional flow and is not suitable for reverse flow conditions, as this may damage the valve or reduce its performance.