The 3329 relay valve allows for precise control over clutches, brakes or cylinders using a small pilot signal.  The valve moves a large volume of air with a high degree of accuracy and minimal hysterisis. The pilot line can be controlled from multiple stations. 

The 3329 is constructed using bronze and stainless steel and is water tight, allowing for use in harsh environments. The 3329 is typically used with pneumatic control heads to ensure controlled flow into systems that require precise pressure control.