Pneumatic solenoid valves can be categorized into two basic types, Direct Acting and Pilot Operated, each with characteristics and advantages, depending on your requirements.
Direct Acting Pneumatic Solenoid Valve advantages:Â
    *  Capable of operation under a full pressure range, including low pressure and vacuum.
    *  Simple, reliable construction with few parts. Low cost.
    *  More tolerant in poor or unstable media conditions.
    *  Versatile, and valves can be tailored to specific applications.
Pilot Operated Solenoid Valves use a Direct Acting Solenoid Valve as a pilot operator. The pilot operator functions to shift a larger directional control valve of piston poppet or spool design. Pilot Operated Pneumatic Solenoid Valves advantages:
    *  Designed primarily for efficient control of air cylinders & air actuators.
    *  Achieves high flow capacity relative to physical size.
    *  Consumes less current (amperage) relative to flow capacity.
    *  Many configurations to select from, particularly in four way functions.
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