Good to Know is a new feature that allows members of the community to answer questions from WebMD experts, doctors, staff, and other community members. We're testing this new feature and we'd like your feedback.
the cylinder (known as Bottom Dead Centre or BDC) the exhaust valve starts to open. As the piston now moves up the cylinder, the hot gases (consisting mostly of nitrogen, carbon dioxide, water vapour and unused oxygen) are expelled from the cylinder. As the Piston approaches TDC again the inlet valve starts to open and the cycle repeats itself.
The steam nozzle discharges a high-velocity jet across the suction. chamber. This steam jet creates a vacuum which extracts air or gas. from the adjoining vessel. As these gases are entrained in the. steam, the mixture travels through the ejector into a venturi-. shaped diffuser. In the diffuser, its velocity energy is converted. into pressure energy, which helps to discharge the mixture against. a predetermined back pressure, either to atmosphere or to a con-. denser (Figure 1).