GT2026081303(R)
Technical parameter
Maximum working pressure: 0.8 MPa
Recommended working pressure: 0.6 MPa
Pipe type and diameter: 6 mm, material Fluoropolymer
Workbench: 1410 mm (L) x 700 mm (W) x 1800 mm (H)
Panel dimensions: 1200 mm x 745 mm x 20 mm
Weight: Approx. 90 kg
Compressed air requirement: 0.8 MPa
Installation conditions: Indoor environment
Voltage: 110V, 50/60 Hz
Product industrial components:
1. Basic hardware of the control panel
No.
Item name
Specifications
QTY
IMAGE
1
 
 
Training table
Made of 1mm-2mm thick metal material; equipped with high-quality axle-type universal wheels.
  
 
1
  
2
 
Transition base plate
ABS synthetic fiber, precision molded and injection molded, attached to the valve.
  
1
  
3
 
 
Swivel casters
2.5mm high-quality steel; with self-locking function; roller bearing, installed at the bottom o the training platform.
 
 
4
  
4
Dedicated aluminum alloy panel
Dedicated Aluminum alloy with"T"shaped fitting and aluminum transition base plate overlap, installed on the training platform.
1
5
 
 
 
Silent air compressor
Air  pump  input  voltage: AC  110V/60Hz;  Motor power: 125W; Rated output pressure: 1.0Mpa; Air pump volume: 10L; Operating noise: < 40dB; with
automatic power-off protection device
 
 
 
1
  
6
Filter     and     pressure regulating assembly
AC2000  Connector  diameter:  1/8”;  Rated  flow
rate: 650L/min; Filter element accuracy: 40µm;  Adjustable  pressure:  0.05-0.85MPa;  Maximum adjustable  pressure:  0.9MPa;   Water   filtration capacity: 15cc; Oil supply capacity: 25cc
1
 
7
Pressure regulating calve with pressure gauge 
AR2000  Connector  diameter:  1/8”;  Rated  flow rate: 650L/min; Adjustable pressure range: 0.050.85MPa;  Maximum  adjustable  pressure: 0.95
MPa; Body material: Die-cast aluminum alloy
1 

 

2. Basic component configuration (industrial)

No.

Item name

Specifications

QTY

IMAGE

8

Double-acting stainless steel single-acting cylinder

 

MLA20*75     Action:     Piston-type;     Operating pressure range: 1-9.0 kgf/cm²; Speed         range:

50–800   mm/s;   Stroke:   75   mm;   Connector diameter: 1/8”

1

 


 

9

Double-acting   stainless steel single-rod doubleacting cylinder

 MA20*100     Action:     Piston-type;     Operating pressure range: 1-9.0 kgf/cm²; Speed         range:

50–800   mm/s;   Stroke:   100   mm;   Connector diameter: 1/8”

 

2

 


 

10

Cylinder mounting feet

MA20-LB

6

11

2-position 3-way single solenoid    directional

3V210-08 Coil positions:Single-head, dualposition, spring return; Actionmethod: Internal pilot; Operating pressure:0.150.85MPa;Powerconsumption:AC

2.5VADC2.5W;Maximumoperatingfrequency:5 times/second; Minimum activation time: 0.05 seconds;Connectingpipediameter: Inlet=Outlet =Exhaust=1/8"

1

   

12

  

2-position 5-way single solenoid directional valve

4V210-08 Coil number: Single-head dual-position spring return; Operating method: Internal pilot type; Working pressure: 0.15-0.85 MPa; Power consumption: AC2.5VA DC2.5W; Maximum operating frequency: 5 times/second; Minimum activation time: 0.05 seconds; Connecting pipe diameter: Inlet=Outlet=1/8"

2


 

13

  1. position 5-way double solenoid directional valve

4V220-08

Coil       number:       Dual-head       dual-position electronically controlled reset; Operating method: Internal pilot type; Working pressure: 0.15-0.85

MPa; Power consumption: AC2.5VA DC2.5W;

Maximum operating frequency: 5 times/second;

Minimum     activation     time:     0.05     seconds;

Connecting pipe diameter: Inlet = Outlet = Exhaust = 1/8"

1

14

  

Center-sealed 3-position

5-way                solenoid directional valve

4V230-08

Coil    position:    Double-headed    three-position enclosed  type; Actuation  method:  Internal  pilot type; Working pressure: 0.15-0.85 MPa; Power consumption:    AC2.5VA    DC2.5W;    Maximum

operating  frequency:  5  times/second;  Minimum activation time: 0.05 seconds; Connecting pipe diameter: Inlet = Outlet = Exhaust = 1/8”

1

15

 

2-position  5-way  single pneumatic directional valve

4A210-08

Structure: Slide valve, one-way pneumatic control, spring return; Pressure range: 0.15-0.85 MPa;

Rated flow rate: 1 (p)→4 (A) 500 l/min

2

17

2-position 5-way double pneumatic directional valve

4A220-08

Structure: Slide valve, two-way pneumatic control

Pressure range: 0.15-0.85 MPa; Rated flow rate: 1

(p)→2 (A) 500 l/min 1 (p)→4 (A) 500 l/min

2

18

Center-sealed 2-position 5-way double pneumatic directional valve

4A230=08

Structure: Slide valve, Two-way pneumatic control;  Pressure range: 0.15-0.85 MPa; Rated flow rate: 1(p)→2(A) 500 l/min 1(p)→4(A) 500 l/min

1

19

Adjustable one-way throttlevalve

ACS-100  

Connectingpipediameter: 1/8”; Standard rated flowrate: (p)→(A)400L/min;Adjustablepressure

range:0.05-0.95MPa

2

 

20

OR gate logic valve (shuttlevalve)

ST-01  

Connecting pipe diameter: 1/8”; Operating pressure range: 0-1.0MPa; Rated flow rate

X,Y→A500l/min

2

 

21

 

 

AND   gate   logic  valve

(dual pressure valve)

STH-01

 Connecting     pipe     diameter:         1/8”;

Operating pressure     range: 0-1.0MPa;

Rated  flow     rate X,Y→A 500 l/min

 

 

 

1

 


 

22

 

 

 

Quick exhaust valve

QV-08

Connector  diameter:  1/8”;  Operating  pressure range: 0-1.0MPa; Constant flow rate: 1(p)→2(A)

300 l/min 2(A)→3(R) 390 l/min

 

   

 

1

19

Adjustable one-way throttle valve

ACS-100  

Connectingpipediameter: 1/8”; Standard rated flowrate: (p)→(A)400L/min;Adjustablepressure

range:0.05-0.95MPa

2

 

20

OR gate logic valve (shuttle valve)

ST-01  

Connecting pipe diameter: 1/8”; Operating pressure range: 0-1.0MPa; Rated flow rate

X,Y→A500l/min

2

 

21

 

 

AND   gate   logic  valve

(dual pressure valve)

STH-01

 Connecting     pipe     diameter:         1/8”;

Operating pressure     range: 0-1.0MPa;

Rated  flow     rate X,Y→A 500 l/min

 

 

 

1

 

22

 

 

 

Quick exhaust valve

QV-08

Connector  diameter:  1/8”;  Operating  pressure range: 0-1.0MPa; Constant flow rate: 1(p)→2(A)

300 l/min 2(A)→3(R) 390 l/min

 

   

 

1

23

MP3P

24

 

Flat-top            push- button mechanical valve

 

Number of positions: 2-position 3-way; Actuation method:  Direct-acting,  spring  return;  Operating pressure   range:   0-0.8MPa;   Connecting   pipe diameter: 1/4”; Rated flow rate (p) → (A) 60 l/min

 

   

 1

 

25

Roller-type lever mechanicalvalve

MP3P Numberof positions: 2-position3way;Actuation method: Direct-acting, spring return; Operating pressure range: 0-0.8MPa; Connecting pipe

diameter:1/4”;Ratedflowrate(p)→(A)60l/min

2

 

3. Electrical module (industrial)

No.

Item name

Specifications

QTY

IMAGE

26

 

 

Time relay module

Display: LED indicator with three digits, 0-999S; Output: One set of normally closed switches, one set of normally open switches, one set of pause switches; Operating voltage: AC110V

 

 

 

1

 

 

27

 

Intermediate    relay module

Each set has 3 normally open and 1 normally closed switches; Wiring socket: φ10mm safety socket, panel is 5mm insulating board

 

 

 

 

2

 

28

 

 

Inductive       proximity switch (with plug and wire)

Switching voltage: 5-30 VDC; Residual ripple: maximum 10%; Rated switching distance: 4 mm; Maximum switching frequency: 100  Hz; Output: no contact/transistor NPN output; Maximum output current: 200 mA; Maximum switching capacity: 4.8 W

 

 

 

 

4

 

29

 

 Start/stop module

110V  60HZ  AC  voltage  circuit  breaker  with leakage protection With power-on indicator

 

 

1

 

30

 Button module

 φ16mm large push button

 

1

 

31

Regulated         power supply module

DC24V  5A;   Wiring   socket:   φ10mm  safety socket, panel is 5mm insulating board

 

1

 

4. Software control (industrial)

No.

Item name

Specifications

QTY

 IMAGE

32

Pneumatic         System

Software

  

Electro-pneumatic Control Simulation Software

 

1

 

  1. Attachments

No.

Item name

Specifications

QTY

 IMAGE

34

L-shaped bracket

Self made

4

              

35

Transition connector

Adapters

1

36

T-shaped tee

T-type

10

            

37

Four-way connector

Phillips head type

4

     
 

38

Air hose

PUO0425 (orange)

50m

                 

39

Tube plug

PP-4

15

40

 Special tools

Adjustable wrenches, screwdrivers, hex wrenches, scissors, etc.

  1

  

The equipment set includes the following components, necessary for teaching the theoretical foundations of pneumatic control technology.
A modular training set for teaching the fundamentals of pneumatic control, designed for assembling basic and sequential pneumatic circuits in an academic laboratory setting.
 
 Didactic content:
  • System for assembling pneumatic circuits on training bench.
  • Detachable components, quick-connect fittings, and clear symbology.
  • Capability for direct and indirect control exercises.
  • Cylinder actuation capability.
  • Speed control capability.
  • Timing capability.
  • Limit switch capability.
  • Logic function capability.
  • Pneumatic memory capability.
  • Impulse valve capability.
  • Sequencing and pressure regulation capability.
  • Air preparation unit with filter, regulator, and pressure gauge.
      • Working Pressure Range: 0.5–12 bar (adjustable via manual knob).
      • Filtration Grade: 40 µm (removes solid particles and condensate).
      • Nominal Flow Rate: 750 LPM.
      • Connections: Quick-connect fittings for Ø6 mm hose (inlet and outlet).
      • Integrated Accessories:
      • Direct-reading pressure gauge for line pressure monitoring.
      • Manual shut-off valve for safe system isolation.
      • Oil mist lubricator (adjustable).
      • Body Material: Transparent polycarbonate (for viewing the condensate level) and metal/nickel-plated components.

                     

  • Shut-off valve.
      • Maximum Working Pressure: 120 bar.
      • Recommended Operating Pressure: 60 bar.
      • Nominal Flow Rate: Up to 10 LPM (compatible with compact educational models).
      • Connection to the Process: Quick connections without leaks (Quick Couplings) or G1/4"threads.
      • Operation: Manual via ergonomic lever with visible locking position.
      • Body Material: Machined steel or high resistance anodized aluminum.
      • Operating Temperature: -10°C to +60°C.

  • Distributor block.
      • Maximum Working Pressure: 120 bar
      • Recommended Operating Pressure: 60 bar
      • Nominal Flow Rate: Up to 10–15 LPM (compatible with standard training pumps)
      • Process Connections:
      • 1 main inlet from the power unit
      • 6 distribution outlets using leak-free quick couplings
      • Body Material: Machined steel or high-strength anodized aluminum
      • Integrated Accessories: Optional ports for installing general pressure monitoring gauges
      • Operating Temperature: -10°C to +60°C

                           

  • 2 normally closed 3/2-way push-button valves.
      • Initial State: Normally Closed (NC); flow opens when the button is pressed.
      • Working Pressure Range: 0–10 bar (standard pneumatics).
      • Nominal Flow Rate: Approx. 300–400 LPM (depending on the internal passage size).
      • Process Connection: Quick-connect fittings for Ø4 mm hose (inlet and outlet).
      • Body Material: High-strength engineering plastic or anodized aluminum.
      • Actuation: Ergonomic push button with optional locking mechanism on some advanced models.
      • Operating Temperature: -10°C to +60°C.

                      

  • 1 normally open 3/2-way push-button valve.
      • Working Pressure Range: 0–10 bar
      • Nominal Flow Rate: Approx. 300–400 LPM
      • Process Connection: Quick-connect fittings for Ø4 mm hose
      • Body Material: High-strength engineering plastic or anodized aluminum
      • Actuation: Ergonomic push button with automatic spring return
      • Operating Temperature: -10°C to +60°C

                        

1 5/2-way selector valve.
      • Working Pressure Range: 0–10 bar
      • Nominal Flow Rate: Approx. 300–400 LPM (depending on the internal passage size)
      • Process Connection: Quick-connect fittings for Ø4 mm hose (5 ports: 1 inlet, 2 outlets, 2 exhausts)
      • Body Material: High-strength engineering plastic or anodized aluminum
      • Operation: Rotary selector knob with fixed (maintained) or spring return positions (depending on the specific set variant)
      • Operating Temperature: -10°C to +60°C

                   

  • 1 normally closed 3/2-way selector valve.
      • Initial State: Normally Closed (NC); allows fluid flow only when the knob is activated.
      • Working Pressure Range: 0–10 bar.
      • Nominal Flow Rate: Approx. 300–400 LPM.
      • Process Connection: Quick-connect fittings for Ø4 mm hose (3 ports: 1 inlet, 1 outlet, 1 exhaust).
      • Body Material: High-strength engineering plastic or anodized aluminum.
      • Actuation: Rotary selector knob with automatic spring return to the initial position.
      • Operating Temperature: -10°C to +60°C.

                         

2 normally closed 3/2-way roller-lever valves.

      • Working Pressure Range:
      • Pneumatic: 0–10 bar.
      • Hydraulic (signal/pilot): Up to 50–120 bar (depending on the specific FESTECH hydraulic series model, e.g., Ref. 15049 is 2/2-way, but adapters are available).
      • Nominal Flow Rate: Approx. 300–400 LPM (Pneumatic) / 1–5 LPM (Signal Hydraulic).
      • Process Connection: Quick-connect fittings for Ø4 mm hose (Pneumatic) or leak-free hydraulic quick-connect fittings.
      • Body Material: Anodized aluminum or high-strength engineering plastic.
      • Actuation: Lever with rotating roller to reduce friction and wear during contact with cams or cylinder stops.
      • Operating Temperature: -10°C to +60°C.

                        

  • 2 pneumatic proximity sensors with cylinder mounting.
      • Power Supply: DC 10–30 V (electronic models) or no external power supply (mechanical reed switch).
      • Signal Output: PNP, Normally Open (NO), with LED status indicator.
      • Switching Current: Max. 200 mA.
      • Switching Frequency: Up to 500 Hz (electronic) or bounce-limited (reed switch).
      • Mounting: Adjustable stainless steel band or T-slot clip for direct attachment to the pneumatic cylinder body (typical diameters Ø16–Ø25 mm).
      • Operating Temperature: -25°C to +70°C.

                        

  • 1 normally closed pneumatic timer.
      • Delay Time Range: Manually adjustable from 0.1 to 30 seconds.
      • Working Pressure Range: 1.5–8.5 bar.
      • Process Connection: Quick-connect fittings for Ø4 mm hose.
      • Body Material: Engineering plastic or anodized aluminum.
      • Adjustment: Micrometer screw to regulate the accumulator's filling/draining flow and thus modify the time.
      • Operating Temperature: -10°C to +60°C.

                          

  • 1 sequence valve.
      • Maximum Working Pressure: 120 bar
      • Recommended Operating Pressure: 60 bar
      • Pressure Adjustment Range: Typically adjustable via micrometer screw (e.g., 10–100 bar, depending on the specific model).
      • Nominal Flow Rate: Up to 10 LPM (compact training models).
      • Process Connection: Leak-free quick couplings or G1/4"threads.
      • Drainage: External drain required to ensure accurate pressure adjustment.
      • Body Material: Machined steel or high-strength anodized aluminum.
      • Operating Temperature: -10°C to +60°C.

                        

  • 1 3/2-way valve, pneumatically actuated on one side.
      • Working Pressure Range: 0–10 bar.
      • Minimum Pilot Pressure: Typically 1.5–2 bar to ensure reliable switching.
      • Nominal Flow Rate: Approx. 300–400 LPM.
      • Process Connection: Quick-connect fittings for Ø4 mm hose (3 ports: 1 inlet, 1 outlet, 1 exhaust).
      • Body Material: High-strength engineering plastic or anodized aluminum.
      • Actuation: Integrated pilot port that receives a compressed air signal to move the valve against the spring force.
      • Operating Temperature: -10°C to +60°C.

                       

  • 1 5/2-way valve, pneumatically actuated on one side.
      • Working Pressure Range: 0–10 bar
      • Minimum Pilot Pressure: Typically 1.5–2 bar to ensure reliable switching
      • Nominal Flow Rate: Approx. 550–800 LPM (depending on internal passage size)
      • Process Connection: Quick-connect fittings for Ø4 mm hose (5 ports: 1 inlet, 2 outlets, 2 exhausts)
      • Body Material: Anodized aluminum or high-strength engineering plastic
      • Actuation: Integrated pilot port that receives a compressed air signal; includes manual override for testing
      • Operating Temperature: -10°C to +60°C

                     

  • 3 5/2-way impulse valves, pneumatically actuated on both sides.
      • Working Pressure Range: 0–10 bar.
      • Minimum Pilot Pressure: Typically 1.5–2 bar to ensure reliable bidirectional switching.
      • Nominal Flow Rate: Approx. 550–800 LPM (depending on internal passage size).
      • Process Connection: Quick-connect fittings for Ø4 mm hose (5 ports: 1 inlet, 2 outlets, 2 exhausts).
      • Body Material: Anodized aluminum or high-strength engineering plastic.
      • Actuation: Two integrated pilot ports; no return springs are used, allowing the position to be maintained indefinitely without energy consumption until the opposite signal is received.
      • Operating Temperature: -10°C to +60°C.

                        

  • 1 OR function circuit selector (shuttle valve).
      • Working Pressure Range: 1–10 bar.
      • Nominal Flow Rate: Up to 550–857 LPM (depending on the specific model, e.g., Ref. 12351/12401).
      • Process Connection: Quick-connect fittings for Ø4 mm hose (3 ports: 2 inlets, 1 outlet).
      • Body Material: Transparent engineering plastic or anodized aluminum (for internal viewing in some educational models).
      • Internal Mechanism: Moving element (ball or poppet) that seals the lower pressure inlet.
      • Operating Temperature: -10°C to +60°C.

                     

  • 2 AND function dual-pressure valves.
      • Working Pressure Range: 1–10 bar
      • Nominal Flow Rate: Up to 550 LPM
      • Process Connection: Quick-connect fittings for Ø4 mm hose (3 ports: 2 inlets, 1 outlet)
      • Body Material: Transparent engineering plastic or anodized aluminum (for internal viewing in some educational models)
      • Internal Mechanism: Moving element (ball or poppet) that shifts toward the lower pressure side, blocking that inlet and allowing flow only when both pressures are present and balanced
      • Operating Temperature: -10°C to +60°C

                       

  • 1 quick-exhaust valve.
      • Working Pressure Range: 0–10 bar
      • Nominal Flow Rate:
      • Actuator Inlet/Outlet: Up to 150 LPM
      • Direct Exhaust: Up to 550 LPM (designed for low restriction)
      • Process Connection: Quick-connect fittings for Ø4 mm hose (3 ports: 1 pressure inlet, 1 cylinder connection, 1 silent exhaust)
      • Body Material: Transparent engineering plastic or anodized aluminum (for internal viewing in some educational models)
      • Internal Mechanism: Moving element (poppet or ball) that seals the pressure inlet when the cylinder exhales, opening the direct exhaust port
      • Operating Temperature: -10°C to +60°C

                      

  • 2 one-way flow control valves (throttle check valves).
      • Maximum Working Pressure: 120 bar
      • Recommended Operating Pressure: 60 bar
      • Nominal Flow Rate: Up to 10 LPM (compact training models)
      • Process Connection: Leak-free quick couplings or G1/4"threads
      • Adjustment: Manual adjustment via needle screw or graduated scale knob for fine flow regulation
      • Body Material: Machined steel or high-strength anodized aluminum
      • Operating Temperature: -10°C to +60°C

  • 1 single-acting cylinder.
      • Maximum Working Pressure: 50–120 bar (depending on whether it is a transparent or standard industrial model).
      • Standard Educational Dimensions:
      • Piston Diameter: 20 mm or 25 mm.
      • Rod Diameter: 12 mm or 18 mm.
      • Effective Stroke: 100 mm to 200 mm.
      • Process Connection: Hydraulic port compatible with leak-free quick couplings from the FESTECH system.
      • Return Mechanism: Integrated high-strength spring or gravity/external load return.
      • Body Material: Anodized aluminum or machined steel; transparent polycarbonate version for visual educational models.
      • Operating Temperature: -10°C to +60°C.

                          

  • 1 double-acting cylinder.
      • Maximum Working Pressure: 120 bar
      • Recommended Operating Pressure: 60 bar
      • Standard Educational Dimensions:
      • Piston Diameter: 16 mm, 20 mm, or 25 mm
      • Rod Diameter: 10 mm, 12 mm, or 18 mm
      • Effective Stroke: 200 mm or 300 mm
      • Process Connection: Hydraulic ports compatible with leak-free FESTECH quick couplings.
      • Body Material: Anodized aluminum or high-strength machined steel
      • Integrated Accessories: Some models include a magnetic sensor for end-position detection or a transparent graduated scale for internal viewing.
      • Operating Temperature: -10°C to +60°C

                         

  • 1 pressure regulator with pressure gauge.
      • Working Pressure Range:
      • Hydraulic: 0–120 bar (typically adjustable 10–100 bar).
      • Integrated/Associated Pressure Gauge:
      • Range: 0–100 bar (Hydraulic)
      • Accuracy: Class 1.6%.
      • Diameter: 40–60 mm.
      • Process Connection: G1/4"thread or leak-free quick couplings compatible with the training system.
      • Adjustment: Manual via ergonomic knob with lockin
      • g nut to maintain the setting.
      • Body Material: Machined steel or anodized aluminum (Hydraulic);
      • Nominal Flow Rate: Up to 10 LPM (Training Hydraulics).

                     

  • 2 additional pressure gauges.
      • Measurement Range: 0–100 bar (standard for educational systems up to 120 bar working pressure).
      • Accuracy: Class 1.6% (high accuracy for calibration and monitoring practice).
      • Dial Diameter: 60 mm (clear reading at an educational distance).
      • Process Connection: Standard thread or leak-free hydraulic quick-connect (compatible with the set's coupling system).
      • Available Options: Standalone model or integrated with a 4–5 port distribution block for simultaneous monitoring.
      • Housing Material: Stainless steel or impact-resistant plastic.
      • Operating Temperature: -10°C to +60°C.

                           

  • Flexible tubing (minimum 10 m).
  • Maximum Working Pressure: 120 bar
  • Inner Diameter: Typically 4 mm or 6 mm (compatible with leak-free quick-connect fittings)
  • Material: Synthetic core resistant to hydraulic oil, textile/metal reinforcement, outer cover resistant to abrasion and oils
  • Connectors: Quick couplings made of steel/nickel-plated brass at both ends
  • Operating Temperature: -40°C to +125°C
  • Minimum Bending Radius: 80 mm

-Fittings, connectors, and accessories required for practical exercises.
-Working pressure compatible with an educational laboratory setting, preferably up to 6 bar.
-Pneumatic connections using flexible plastic tubing, preferably 4 mm. - Components identified by standardized symbols or educational labels. Designed for educational purposes.
Scope of supply: complete pneumatic assembly, training bench or panel, air preparation unit, valves, cylinders, sensors, timers, pressure gauges, distribution block, tubing, fittings, accessories, manuals in English, pneumatic diagrams, and practical exercise guide.
Practical exercises guide:
1. Reversing circuit for single-acting cylinder
2. Reversing circuit for double-acting cylinder
3. Primary pressure control circuit
4. Secondary pressure control circuit
5. High/low pressure switching circuit experiment,
6. Two-way speed control circuit for double-acting cylinder (inlet metering / outlet metering)
7. Speed switching circuit
8. Cushioning circuit
9. Interlock circuit
10. Overload protection circuit
11. Position-controlled single-reciprocation circuit
12. Pressure-controlled single-reciprocation circuit
13. Time-controlled single-reciprocation circuit
14. Continuous reciprocating circuit for single/double-acting cylinders
15. Synchronization circuit using throttle valves
16. Three-cylinder linked operation circuit
17. Counting circuit
18. Time-delay circuit
19. Logic valve application circuit (OR logic)
20. Two-hand operation circuit

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