Common accessories for pneumatic valves include: directional solenoid valves, air filters, limit switches, and electrical positioners. In pneumatic technology, the combination of a pressure-reducing valve, air filter, and oil mist eliminator is referred to as a pneumatic triple union. It is used for purifying and filtering the air source for pneumatic instruments and reducing the pressure to the specified pressure for instrument supply, akin to the function of a power transformer in electrical circuits.
An air-operated three-way regulating valve is a straightforward and simple flow control device.
The pneumatic three-way regulating valve can replace two two-way regulating valves used simultaneously, serving the functions of both merging and splitting flows, as well as adjusting the proportion of two phases.