شیر 5/2 PARKER سایز 1/4 مدل P2LBX512ESNDDB49A

The 5/2-way pneumatic valve has five connection ports and two states. It has one pressure port (P,1), two ports (A,2) and (B,4) that connect to the device that needs to be controlled, and two exhaust ports (EA,3) and (EB,5). The two states of the valve are:

Pressure port (P,1) connects to port (A,2), while port (B,4) vents through exhaust port (EB,5)
Pressure port (P,1) connects to port (B,4), while port (A,2) vents through port (EA,3).

Different manufacturers use different port designations. There is also a standard designation: ISO-1210-1. This standard we aim to maintain in our articles as much as possible. The ISO standard uses numbers to designate the different ports. Some manufacturers, however, use letters to somewhat clarify the port designations.

In the example, ISO port 1 is also designated with a letter P from pressure, which is the connecting point for the pressure line. The outlet ports (or working ports) with the ISO designations 2 and 4 are alternatively designated with the letters A and B. The corresponding exhaust ports have the ISO designation numbers 3 and 5. The alternative letter designations of these ports are respectively EA and EB, which means exhaust from A and exhaust from B. Valve symbols with a single exhaust port like, for example, 3/2-way or 4/2-way valves, the exhaust port number 3 (ISO) is alternatively designated with the letter R (relief)