Components of Pneumatic Control System


Pneumatic Control System 

What is pneumatic ?

Pneumatic is the technology that makes use of gas or pressurized air.

Components of Pneumatic control system

1.Directional control Valves

These are functional valves used in logic implementation.

Divided according to the number of ports / passages available and number of valve positions 


2.Two Way Valves

Has two ports

Are Manually operated , Pilot operated or Solenoid operated

Either Normally Open or Closed

Two Way Valves

In one position IN and OUT ports are connected

In another position, IN and OUT ports are isolated 

Connection of Two way valve

3.Three way valves

The mostly used logical component.

In one position IN is blocked and OUT connected to Exhaust

In another position IN gets connected to OUT and the EX port blocked

Three Way Valve

4.Manually Operated 3 Way

Manual ‘push’ changes the normal position of the valve

In a spring return valve, position returns to normal condition on manual release.

Manually Operated 3 way

3 way Valve Paths

3 way valve paths

5.Pilot Operated 3 way

The pilot is opposed by a spring tension, which returns the valve to its normal position on pilot removal 

Pilot Operated 3 way

6.Pilot Operated Pilot Return

No spring to return the Valve

2nd Pilot used to return the valve

Port configuration is stay put until next pilot

Pilot Operated Pilot Return

7.Solenoid Operated 3 Way

Piloting done by solenoid

The solenoid coil is magnetized by applying electric power


8.Solenoid operated solenoid return

Used Where electric pulse is preferred over continuous supply

Solenoid operated solenoid return

9.Manual Reset Valve

Manual Reset essential to effect the pilot
Auto trip on loss of pilot

Manual Reset Valve

10.Manual Reset valve with indicator

Indicates the Status of signal presence
Manual Reset Facility
Auto Trip

Manual Reset valve with indicator

11.Flow Control Valve

Used for achieving delayed responses
Allows free flow in one direction while restricting flow in other direction

Flow Control Valve

12.Panic Valves

Also called ESD Valves
Are 2 port 2 Position NC type 

Panic Valves


13.Shuttle Valve

Pneumatic equivalent of electronic OR gate
Presence of any one input yields an output.

Shuttle Valve


14.Amot Indicators

Indicates the status of control pressure
Provides first-out and thus easy trouble shooting
Can be used also as a logical component.

Amot Indicator

15.Check Valves

Also called non-return valves
Allow flow in one direction and blocks reverse flow

Check Valves

16.Relief Valves

Used in Hydraulic circuits
Functions as a back pressure regulator
Relief pressure ranges from 100 to 10,000 PSI

Relief Valves


17.Quick Exhaust Valve

Is a 2 position high flow control valve
Assures rapid closure of a Shutdown Valve

Quick Exhaust Valve

18.Hydraulic dump Valve

Also called hydraulic interface valve
Establishes high pressure hydraulic output
Optional manual override facility available

Hydraulic dump Valve

19.Sigma Master Reset Valve

Used as an interface between shutdown panel and shutdown valve
Often referred to as two phase relay
Capable of maintaining higher supply pressure with lower pilot pressure
Field Reset and Shutdown facility
Blocks inlet when supply falls below 40 PSI

Sigma Master Reset Valve


20.Pressure Switch- High , Low

Combination of two 3 Way components
Low switch is connected to NC port while High switch connected to NO port
Standard supply and outlet pressure is 50 PSI 

Pressure Switch- High , Low

21.Hydraulic Accumulators

Stores large amount of energy in smaller volume
Used in primary hydraulic header of SDP-100
Helps to absorb pressure shoot up due to temperature effect.

Hydraulic Accumulators

22.Haskel Pumps

Converts pneumatic force into hydraulic force.

The nominal pressure ratio is indicated by the pump model number

huskel pump



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