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:
* 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.