What is the working process of manual butterfly valves

Manual Butterfly Valves are a type of valve used for fluid control, and their working process is based on the rotation of the valve disc. The following is a detailed description of the working process of the manual butterfly valve:

starting state

The initial state of the manual butterfly valve is the fully open state of the valve. In this state, the valve disc is parallel to the inner wall of the valve body, allowing fluid to pass freely. The manual operating handle is rotated to a certain position to adjust the valve disc from the open state to the required flow control state.

handle rotation

The operator starts the working process of the valve by manually rotating the operating handle. The rotation of the handle is transmitted to the valve stem through the connecting shaft, and then transmitted to the valve disc from the valve stem.

Valve disc rotation

The valve disc begins to rotate around the connecting axis in its center. As the handle rotates, the angle of the valve disc changes accordingly. This rotational motion determines how open the valve is, thereby controlling the speed and amount of fluid passing through the valve.

fluid control

The rotation of the valve disc causes the valve opening to change. When the valve disc is completely parallel to the valve body, the valve is in a fully open state, allowing maximum flow to pass through. On the contrary, when the valve disc is rotated to be vertically aligned with the valve body, the valve is completely closed, preventing fluid from passing through. In the intermediate position, the valve opening is between fully open and fully closed, allowing precise control of the fluid.

Sealing

When the valve is closed, the edge of the valve disc and the valve seat are completely sealed to ensure that the valve does not leak fluid. This tightness is an important characteristic of manual butterfly valves in fluid control, which can prevent system leakage and maintain operational accuracy.

Hydrodynamics

Due to the round or oval design of the valve disc, the manual butterfly valve has relatively little resistance to the fluid in the open state. This makes manual butterfly valves particularly advantageous in applications requiring rapid fluid control.

Stop and adjust

The rotation of the handle can not only fully open or close the valve, but also adjust and stop the flow by controlling the angle of the valve disc. This flexibility allows manual butterfly valves to be widely used in systems with different flow requirements.