Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice. A|2 Appendix Pneumatic symbols Switching and Repositioning Mechanical Plunger Sensitive plunger Roller Unidirectional roller Sensitive roller Pedal Pedal - spring return Push Button Sensitive push button Push button - two positionsLever Lever - spring to center Sensitive lever Two position mechanical stop Three position mechanical stop Spring Pneumatics Pneumatic Pneumatic -return to center Pneumatic - depressurised Differential (pneumatic spring) Differential external pilot Sensitive differential Electrical Solenoid Bistable solenoid Solenoid (internal pilot) Solenoid (external pilot) Solenoid - spring to center Solenoid with suppl. pilot Valves and solenoid valves 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. 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 Complementary valves Throttle valve Bidirectional flow regulator Unidirectional flow regulator Quick exhaust valve Shuttle valve Silencer Non-return valve without spring Non-return valve with spring Non-return valve controlled during closing Non-return valve controlled during opening Valves symbols Way Pos. Function Symbol 2 2 Normally closed 2 2 Normally open 3 2 Normally closed 3 2 Normally open 5 2 Separated exhaust connections 5 3 Closed centres 5 3 Open centres 5 3 Pressured centres Solutions for pneumatic automation General Catalogue APPENDIX A
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