Manual circular plug valve, also known as manual knife gate valve, is a valve where the gate and seat are always in tight contact for sealing. Its working principle involves manually operating to either completely disengage or align the circular opening on the gate with the valve seat's bore, thereby achieving the opening and closing of the valve.

Structural Features

The manual circular plug valve structure includes frame, gate plate, screw, nut, handwheel, and other components. It features a compact design, small size, easy installation, and is suitable for various operating conditions. The valve body is equipped with a movable gate plate, which has a circular opening matching the pipeline diameter, enabling manual operation for opening and closing.

Application Scenarios

Manual circular plug valves are widely used in industries such as metallurgy, mining, construction materials, and grain, among others. They are typically paired with unloaders to control the flow or conveying amount of powdered, granular, particle, and small piece materials. Moreover, manual circular plug valves are also suitable for transportation pipelines containing solid and dusty materials.

Advantages and Disadvantages

‌Advantages:‌

‌Simple Structure: Components are compactly designed, with tight fits and easy installation._

‌Maintenance Convenience: Lightweight for easy transportation and installation, reducing installation costs and labor input._

Sealed Reliability: The gate and valve seat are in tight contact, ensuring excellent sealing performance and preventing medium leakage.

Wide Application Range: Suitable for various operating conditions and media, such as high temperatures or corrosive substances.

‌Shortcomings:

Manual Operation: Requires human intervention; not suitable for frequent or remote control scenarios.