SMC Corporation of America
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SMC VK3120-1G-01-F 5 port sol valve poppet type, body port, 4/5 PORT SOLENOID VALVE

5 Port Sol Valve Poppet Type, Body Port, 4/5 PORT SOLENOID VALVE, I94, 90.00000 lb

https://www.smcpneumatics.com/VK3120-1G-01-F.html
Why is air constantly leaking from the EA port of my SY5120-1G-C6 solenoid valve? It has been used for cylinder driving for about five years.

Supposing the valve is not defective, air may have entered port B of the solenoid valve and collected around the valve due to internal cylinder leakage. Confirm whether the leakage is due to improper sealing of the cylinder piston seal.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=directional-control-valves&fa_id=10017