What is rotary valve
What is rotary valve
- Rotary valve, also known as unloading valve and star unloader, is a mechanical device that changes the valve from the open position to the closed position by rotating a rotating component such as a rotating baffle.
- A rotary valve is a device that achieves fluid control by rotating a valve. In a rotary valve, the opening and closing, regulation, distribution, etc. of the fluid in the pipeline are controlled through the rotation of the valve. Therefore, the rotary valve is often called a revolving door. Rotary valves usually consist of a valve body, a valve shaft and a valve sealing ring.
Rotary valve working principle
- The working principle of the rotary valve is mainly based on its design structure and working mechanism. The rotary valve usually consists of a rotor blade.
- When the material in the upper bin falls by its own weight and fills the space of the rotor blade, as the blade rotates, the material is taken to the lower outlet and discharged, thereby achieving continuous feeding and unloading. function of the material.
- This design is particularly important in pneumatic conveying systems because it can not only supply materials, but also lock the air flow.
- Through the low-speed rotation of the rotor and the extremely small gap between the rotor and the inner cavity of the housing, it effectively prevents the reverse flow of the air flow, thereby maintaining The air pressure in the system is stable and the materials are discharged normally.
- The self-cleaning rotary valve is improved on the basis of ordinary rotary valves. By adding a cleaning blade (scraper), it can automatically remove the residual material on the rotor while dosing the material quantitatively.
- It is especially suitable for sticky and easy-to-stick valves. block of special materials. Its working principle involves the coordinated work of two upper and lower rotors: the upper rotor is equipped with blades for quantitative feeding, while the lower rotor is equipped with a cleaning blade, which uses the difference in rotational speed of the upper and lower rotors to achieve self-cleaning while quantitatively feeding.
- The working principle of the eccentric rotary valve is to use an eccentrically rotating sector-shaped ball valve to open and close the valve through the engagement and separation of the eccentric ball crown and the valve seat. When opening, the ball core separates from the valve seat; when closing, the ball core gradually contacts the valve seat, exerting a compressing force on the valve seat.
Rotary valve diagram
What is a rotary valve used for?
- Specific uses for rotary valves include:
- Unloading: In the negative pressure pneumatic conveying system, the rotary valve is installed under the cyclone separator and dust collector as an unloader to unload materials.
- Air lock: Through low-speed rotation and a very small gap between the rotor and the inner cavity of the housing, the rotary valve effectively prevents the reverse flow of air and keeps the air pressure in the system stable.
- Feeding: In the pneumatic conveying system, the rotary valve continuously supplies material to ensure the normal discharge of materials.
- Prevent clogging: The rotary valve can transport materials evenly and continuously, prevent gas and solid materials from accumulating in the pipeline, and avoid blockage and leakage.
