Page 71 - PNEUMATIC SYSTEM INSTRUMENT
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CHECK VALVE / NON-RETURN VALVE
































                   Figure 9.1: Check valve / non-return valve and standard symbol





               A non-return valve allows free air flow in one direction and if off the

               opposite. These valves are also referred to as check valves. Non-return


               valves are incorporated in speed controllers and self-seal fittings.

























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