Non-return valves

The non-return valve allows a signal to flow through the device in one
direction and in the other direction blocks the flow. Amongst others, this
principle is applied in shuttle valves or quick exhaust valves. The nonreturn
valve in the form of a basic element of other valve types is shown
in a broken outline in the illustration below.
- Check valve.
- Shuttle valve.
- Dual-pressure valve.
- Quick exhaust valve.