Remote mount solenoids can be mounted on or near the actuators and require the air to be piped to the actuator. Modern rack & pinion actuators have universal “NAMUR” supply port configurations that allow the use of special direct mount solenoids to eliminate the need for tubing or fittings. You must also vent the pressure side of the piston(s) or diaphragm as the actuator is returning to its normal position. If you do not vent the actuator, it will not completely stroke the valve. When you add air to one side of the piston(s) or diaphragm, you must vent air from the opposite side in order for the piston or diaphragm to move and operate your valve. Spring return actuators have springs on the ends of the pistons that return the pistons to a specific position when the air is removed from the actuator. There are also diaphragm actuators that utilize a rubber diaphragm with a spring attached to a rod, which operates the valve. Many pneumatic actuators consist of either one or two pistons inside a cylinder that connects to a rod or pinion which operates your valve. Most pneumatic valve actuators fall into one of two categories: double acting (fail in place) or spring return (fail open or fail closed). Now let’s look at basic types of actuators and then decide what type of solenoid we need to operate them.
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