The wafer check valve is driven to open and close by the medium flow pressure, and uses the one-way valve disc structure to prevent the medium from flowing back. The specific operation mode is as follows:
1. Core operation mechanism
Medium pressure drives opening
When the medium flows forward, the fluid pressure pushes the valve disc (such as single disc, double disc or butterfly disc) to overcome the spring force or gravity to open the valve.
After the valve disc is opened, it fits the inner wall of the valve body to form a low flow resistance channel and reduce pressure loss.
Automatic closing to block backflow
When the medium stops flowing or flows back, the valve disc closes quickly under the action of spring force, gravity or reverse pressure, and the sealing surface presses the valve seat to completely block the backflow.
The double disc structure is linked by the hinge shaft, and the two discs are closed synchronously, with a faster response speed.
2. Main structural types and features
Lifting wafer check valve
The valve disc rises and falls along the vertical axis, suitable for vertical or horizontal pipelines.
Spring loading design: Force the valve disc to close to avoid sealing failure at low flow rate.
Swing Wafer Check Valve
Single-flap swing type: The valve disc rotates around the hinge axis, suitable for medium and low pressure pipelines.
Double-flap swing type: The two flaps are symmetrically distributed, and they are opened and closed synchronously by springs or medium pressure, with a short closing time, which can reduce water hammer impact.
Butterfly Wafer Check Valve
The butterfly valve disc is controlled by a rotating shaft, and the flow resistance is extremely small when fully open, which is suitable for large flow scenarios.
3. Key design optimizations
Sealing performance
The valve disc and valve seat use metal hard seals or rubber/PTFE soft seals, and the leakage level can reach ANSI VI level.
The precision hinge structure ensures that the valve disc rotates flexibly and fits tightly when closed.
Impact resistance and adaptability
The double-flap structure reduces the closing impact through spring buffering and extends the life of the valve.
The streamlined valve body design is suitable for a variety of media such as water, oil, gas, and steam, with a temperature range of -40℃~200℃. IV. Typical application scenarios
Water pump outlet: prevent the medium from flowing back when the pump is stopped, causing the impeller to reverse.
Chemical pipeline: block the backflow of corrosive media and protect the safety of equipment.
Municipal water supply: reduce the water hammer effect and ensure the stability of the pipeline network.