External valve assemblies are used to expand the volume range of SAR-830 series ventilators, or to add additional ventilator stations. The valve assembly connects to the ventilator through a supplied 12’ cable, and acts as a slave to the SAR-830. The CTP-VA-1 (shown at right) is equivalent to the standard SAR-830 internal valves, and is used to create one or more additional ventilator stations. To connect more than one valve assembly, an MVA-4 electrical adapter is required (see below). A controlled flow source is required for each external valve assembly. Tubing and connectors are supplied.