Hydraulic solenoid valves are commonly similar to pneumatic solenoid valves other than that they control the flow of hydraulic fluid (oil). Hydraulic equipment use solenoids to control the stream of oil. Pneumatic pressure enters this housing applying pressure for the diaphragm. Given that the air pressure improves for the diaphragm https://cristianan520.smblogsites.com/15653601/วาล-ว-fundamentals-explained