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Appendix Pneumatic symbols Solutions for pneumatic automation General Catalogue Valves and solenoid valves Terms and descriptions The connections to the inlet and out lets of the valves can be of two types: Main connections - supply connection identified with number 1 - consumption connection identified with number 2 and 4 - exhaust connection identified with number 3 and 5 Pilot connections - repositioning connection on 2/2 & 3/2 ways valves identified with number 10 - switching connection on 2/2 & 3/2 ways valves and repositioning connection on 5/2 & 5/3 ways valves identified with number 12 - switching connection on 5/2 & 5/3 ways valve identified with number 14 Switching: is the process that changes the state of a valve from rest position to actuated position and is achieved by means of a mechanical, pneumatic or electric signal. Repositioning: is the process that changes the valve state from actuated back to rest position and is achieved by means of an external mechanical (spring), pneumatic (differential) or electric signal. Ways: indicated the number of connections on the valve body and on the pneumatic diagram. Positions: indicates the number of positions achieved by the valve and corresponds to the number of squares on the pneumatic simple. Function: indicates the valve working diagram at rest condition and corresponds to the right square in the pneumatic scheme. Valves symbols Switching and Repositioning Symbol Mechanical Way Pos. Function 2 2 Normally closed 2 2 Normally open 3 2 Normally closed 3 2 Normally open 5 2 Separated exhaust connections Pedal 5 3 Closed centres Pedal - spring return 5 3 Open centres Push Button Plunger Sensitive plunger Roller Unidirectional roller 5 3 Pressured centres Sensitive roller A Sensitive push button APPENDIX Push button - two positionsLever Complementary valves Lever - spring to center Throttle valve Sensitive lever Bidirectional flow regulator Two position mechanical stop Unidirectional flow regulator Three position mechanical stop Quick exhaust valve Spring Shuttle valve Pneumatics Pneumatic Silencer Pneumatic -return to center Non-return valve without spring Pneumatic - depressurised Non-return valve with spring Differential (pneumatic spring) Non-return valve controlled during closing Differential external pilot Non-return valve controlled during opening Sensitive differential Electrical Solenoid Bistable solenoid Solenoid (internal pilot) Solenoid (external pilot) Solenoid - spring to center Solenoid with suppl. pilot Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice. A|2
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