1. 2/2. Valve:
•The 2-port, 2-position (open or close) poppet valve with its symbol is shown in Fig.
Fig. 2-port, 2-position poppet valve
2. 3/2 Valve:
• A solenoid operated spool valve (3-port and 2 positions) symbol is shown in Fig.
Fig. Solenoid operated 3/2 valve
3. 4/2 Valve
•A solenoid operated 4-port, 2 position valve symbol is shown in Fig.
Fig. Solenoid operated 4/2 valve.
4. 5/2 Valve:
A solenoid operated 5/2 valve is shown in Fig.
Fig. 5/2 Valve.
5. 5/2 Pilovt operated DC Valve
• For easy exhausting of the valve 5/2 pilot operated valve are preferred over 4/2 valve:
– 5/2 DC valve spool type design pilot operated.
Fig. 5I2 Pilot operated DC Valve
– No. of parts = 5; no. of position = 2
– Position depend upon the pilot signal produced
– It is a bistable valve