The QB Series uses Proportion-Air’s patented technology for closed loop control. The QB Series valves can be built in either a single loop or double loop control scheme.
The QBT Series is used to control pressure of inert gases from full vacuum up to 300 psig (21 bar). The QBS is used in applications where the maximum calibrated pressure ranges are between 300 and 500 psig (34 bar). The QBS Series can also be used in applications where the pressure ranges are below 300 psig (21 bar) if the wetted parts on the QBS are compatible with the media being controlled.
The QBS Series uses a solid one piece manifold for added strength, available in anodized aluminum or stainless steel. There are two outlet ports which allows flexibility in mounting options. In all QBS models, a stainless steel pressure sensor that utilizes dry technology instead of liquid fill, is used internally for increased reliability and enhanced media compatibility.