Chapter 3 Basic  Pneumatic Control Circuit

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 3-1 Pneumatic control circuit        

3-1-1¡@pressure control circuit diagram of the representation P99

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3-1-2 Positioning and non-positioning circuit indicates P102          

3-1-3 signal flow of Pneumatic control circuit         

3-2 Naming of components in the pneumatic control circuit   P103  

(a)  Digital naming        
 

(b)  English alphabet naming

1.  Normal valve position: flap position when the operation force or the control signal is not applied  ( refer to non-memory characteristics of the valve ) , as shown in FIG 3-12 (b) .
2. The Initial Valve the Position : Since the pressure of the installation or operation of the main circuit starts its operation prior to the cutting action of the already flap position, FIG. 3-12 (c) .
3. The Actuated Valve Position : After the operation of the valve flap when the force operating location, FIG. 3-12 (d) .

The one-way roller control valve only outputs the control signal when it touches in the forward direction , but no signal occurs in the reverse direction .

3-3 Basic  pneumatic circuit diagram   P107 

3-3-1 Direct control of a pneumatic cylinder 

( a ) using the push button switch control proceeds directly to a single-acting pneumatic cylinder of the (extended) and return (return line)    
        

( b )  Direct control of double-acting pneumatic cylinder forward and backward P108

( c )  the circuit of the pneumatic cylinder can be sped at any position in the middle P110                                     

3-3-2 Actuator speed control P110        

( 1 ) Deceleration control  

1. The intake throttling (meter-in) control

2. Exhaust throttle (meter-out) mode control P112

( 2 ) Acceleration control  P115

3-3-3  Application of Shuttle valve circuit P117          

Equivalent electrical circuit : P117 

 Parallel circuit
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3-3-4  Dual pressure valve circuit application  

 Equivalent electrical circuit: P119 

   Series circuit        

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3-3-5 Pneumatic cylinder indirect control P121  

( 1 )  Indirect control using a single-sided pneumatic valve    P121         
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( 2 )   Indirectly Controlled using bilateral pneumatic valves   P122

( 3 )  automatic return of pneumatic cylinder P123

( 4 )  Continuous reciprocating motion of the pneumatic cylinder  P123

3-3-6 Timing valve circuit application P124  

( a ) Delayed return circuit of pneumatic cylinder ( 1 ) P124         
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( b ) Delayed return circuit of pneumatic cylinder ( 2 ) P127

( c ) Circuit of delayed forward and delayed return of pneumatic cylinder   P128

3-3-7 Safety circuit operated by both hands  P129  

(a)  Circuit operated by both hands  P129        
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(b)  Safety circuit operated by both hands   P130 

3-3-8 Control loop for automatic (continuous) and manual (single) cycle processing   P131          

3-3-9 Emergency Management   P132          

( a ) Urgent return immediately

( b ) Emergency s in place, continue unfinished action after release P133

( c ) Emergency s on the spot, return first after release and then restart P134.

After-class exercises: manual/automatic single-cylinder reciprocating delay return control circuit         

  Chapter 4 Circuit Design of  Pressure Control System                      

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FIN