Hydraulic solenoid valves are usually similar to pneumatic solenoid valves except that they control the flow of hydraulic fluid (oil). Hydraulic devices use solenoids to control the flow of oil. Pneumatic pressure enters this housing applying pressure on the diaphragm. As the air pressure boosts into the diaphragm the power https://landenpcnud.blogdomago.com/17371258/detailed-notes-on-electric-actuator