OPERATION: SINGLE SMALL ORIFICE AIR RELEASE VALVE   Liquid enters the valve chamber raising the float upward to close the small orifice. Disentrained air rises through the liquid and accumulates in the top of the valve chamber. When the volume of air is sufficient the float is no longer buoyant and gravitates downwards thereby opening the small orifice and allowing
OPERATION: DOUBLE ORIFICE AIR RELEASE   HIGH VOLUME AIR DISCHARGE (FILLING OF A PIPELINE)   Air enters the valve and flows through the annular area around the kinetic shield and discharges out of the large
PRESSURIZED AIR DISCHARGE (PIPELINE OPERATING) Subsequent to the filling of a pipeline, liquid enters the valve chamber and the floats are buoyed so that the upper float closes the large orifice, the valve will then become internally pressurized. Disentrained air rises through the liquid and accumulates in the valve chamber, when the volume of air is sufficient to displace the liquid, the lower float is no longer buoyant  and gravitates downwards thereby opening the small orifice and allowing accumulated air to be discharged to atmosphere. As the air is discharged the liquid raises the
HIGH VOLUME AIR INTAKE (PIPELINE DRAINING) Simultaneous drainage of liquid from the valve chamber  and the loss of pressure causes both floats to gravitate downwards thereby opening the large orifice and allowing atmospheric air through the valve to replace draining liquid in the pipeline and prevent potentially damaging internal