The spool posture could possibly be actuated by mechanical levers, hydraulic pilot pressure, or solenoids which press the spool left or right. A seal makes it possible for A part of the spool to protrude outdoors the housing, the place it's obtainable for the actuator. Energy resource: This supplies the https://pressure-gauge37864.blogstival.com/35460707/what-does-diaphragm-seal-mean