How does a globe valve control fluid flow by rotating the handle or operating mechanism?

The principle of the globe valve to control the flow of fluid by rotating the handle or operating mechanism is mainly based on the up and down movement of the valve disc, thereby realizing the opening and closing of the fluid channel. The following is a detailed explanation:

Basic structure of the globe valve
The globe valve is mainly composed of a valve body, a valve disc (or a valve disc), a valve stem, a valve seat and an operating mechanism (such as a handwheel, a motor, a pneumatic actuator, etc.). The valve disc is a key component for controlling the flow of fluid, and it is connected to the operating mechanism through the valve stem.

Principle of controlling fluid flow
Valve opening:
When the operator rotates the valve handle or operating lever (such as a handwheel), the valve stem will rotate or move up and down accordingly.
The movement of the valve stem drives the valve disc to move upward, so that a channel is formed between the valve disc and the valve seat.
This channel allows the fluid to pass through the valve smoothly, and the valve is in the open state at this time.
When the valve is fully open, the channel has no obstruction to the fluid and the fluid can flow freely.
Valve closing:
On the contrary, when the operator rotates the valve handle or operating lever in the opposite direction, the valve stem will move downward.
The movement of the valve stem drives the valve disc to move downward, so that the valve disc gradually approaches the valve seat.
As the gap between the valve disc and the valve seat gradually decreases, the fluid channel gradually narrows.
When the valve disc is fully closed and fits the valve seat, the channel is completely blocked and the valve blocks the flow of fluid.
Sealing performance
The sealing performance of the globe valve is an important part of its working principle. When the valve disc is fully closed and fits the valve seat, a good sealing effect is achieved through the contact between the valve disc and the valve seat, thereby preventing fluid leakage.
The quality of the sealing performance depends on the smoothness of the contact surface between the valve disc and the valve seat and the design of the sealing structure.
Selection of operating mechanism
The operating mechanism of the globe valve can be manual (such as a hand wheel) or automatic (such as a motor, pneumatic actuator, etc.).
The manual operating mechanism usually controls the position of the valve disc by rotating the handle or moving the handle up and down.
The automatic operating mechanism drives the valve stem to rise and fall or rotate through motor drive or pneumatic force to achieve the switch control of the valve disc.
In summary, the globe valve controls the up and down movement of the valve disc by rotating the handle or operating mechanism, thereby realizing the opening and closing of the fluid channel, thereby controlling the flow of the fluid. This control method is simple and reliable and is widely used in various pipeline systems.