A single-gate valve is not a check valve.
Many people easily confuse gate valves with check valves, but they are like refrigerators and air conditioners-Both are electrical appliances, but their functions are completely different. A single-gate valve's main function is to cut off or connect fluid in a pipeline; it is an on/off type valve. A check valve, on the other hand, is a device that automatically prevents backflow of the medium. The key differences are:
Gate valves require manual/electric operation.
Check valves operate based on the fluid's own pressure.
Gate valves can shut off fluid in both directions.
Check valves only allow unidirectional flow.
The secret of the gate valve's core: Opening the "black box" of a gate valve reveals its core component: a wedge-shaped gate (what you call the valve core). This design is ingenious:
Wedge-shaped structure: Cuts the medium vertically, like a knife slicing through butter.
Full-bore design: The channel is the same diameter as the pipe when open, minimizing pressure loss.
Metal seal: The gate and seat fit tightly, achieving zero leakage.
High-pressure resistance: The simple structure provides higher pressure resistance.
Practical tips for selecting valves: Next time you buy valves, remember this simple rule:
Choose a gate valve for on/off control.
Use a check valve to prevent backflow.
Choose a gate valve for frequent adjustments.
Use a butterfly valve for smaller spaces.
