The Model 30 is designed for applications that require high capacity and accurate process control.  A supply valve, which is balanced by utilizing a rolling diaphragm, insures a constant output pressure even during wide supply pressure variations.  Stability of regulated pressure is maintained under varying flow conditions through the use of an aspirator tube which adjusts the supply valve in accordance with the flow velocity.

Operating Principles:  The Model 30 Regulator uses the force balance principal to control the movement of the valve assembly which in turn controls the output pressure.  When the regulator is adjusted for a specific set point, the downward force of the Range Spring causes the Diaphragm Assembly to move downward.  The Supply Valve opens and allows air to pass to the Outlet Port. As the set point is reached, the downward force exerted by the Range Spring is balanced by the upward force of the downstream pressure acting on the bottom of the Diaphragm Assembly.  The resultant force moves the Supply Valve upward to reduce the flow of air to the Outlet Port.  Outlet pressure is maintained as a result of balance between forces acting on the top and bottom of the Diaphragm Assembly.