| skos:altLabel | - check
- flapper
- valve
- cock
- Backflow preventer
- Ball check valve
- Check valve#stop-check valve
- Check_valve#Applications
- Foot valve
- Non Return Valve (check Valve)
- atmospheric type
- ball check valve
- ball check valves
- check valve
- check valves
- clack boxes
- clack valves
- clackboxes
- clapper valve
- feed check valve
- flap valves
- foot valve
- non-return valve
- one-way
- one-way ball valve
- one-way check valve
- one-way filter valve
- one-way valve
- return valve
- swing check valve
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