You can get pneumatic 4/2 valves with the identical siamese ex port arrangement as the hydraulic 4-2 (e.g. SMC VH402-04). The differences you've outlined are the differences between a 4-2 and a 5-2 valve generally, regardless of the fluid involved.
A common term I usually run across in 5/2 directional valves is "4 way". Does that imply that only 4 of the ports are actually piped and the 5th is just exhaust?
Actually 2 ports are exhaust. Since they are both exhaust some say it is a 4 way and some say it is a 5 way. The advantage of calling it a 5 way is you know it is pneumatic. Either way 2 are exhaust one is pressure and 2 are actuator ports. Hope this helps
I’m having a problem with a pneumatic valve. extends but sometimes the exhaust doesn’t release the air or it won’t retract until I disconnect the air line then it works. I put new solenoid and valves. Thank you
solenoid is a device that moves a piston in and out typically with electromagnetism, like a motor, in this case the solenoid piston moves the directional control valve back and forth.
