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A partial vacuum may be generated by increasing the volume of a container. To continue evacuating a chamber indefinitely without requiring infinite growth, a compartment of the vacuum can be repeatedly closed off, exhausted, and expanded again. This is the principle behind a positive displacement pump, for example the manual water pump. Inside ...
The NEG acts as a getter or getter pump that is able to reduce the pressure to less than 10 −12 mbar. Non-evaporable getters , which work at high temperature, generally consist of a film of a special alloy, often primarily zirconium ; the requirement is that the alloy materials must form a passivation layer at room temperature which ...
Most general pumps can increase as well as decrease the pressure of a gas; however, this category contains pumps that are usually exclusively used to decrease pressure. Wikimedia Commons has media related to Vacuum pumps .
Single-use double-valve manual vacuum aspirator. Vacuum or suction aspiration is a procedure that uses a vacuum source to remove an embryo or fetus through the cervix.The procedure is performed to induce abortion, as a treatment for incomplete spontaneous abortion (otherwise commonly known as miscarriage) or retained fetal and placental tissue, or to obtain a sample of uterine lining ...
Airlift pumps use compressed air to lift water; Pulser pumps use a subterranean air chamber to lift underground water; Suction dredges use a variety of the gas lift called an airlift pump to vacuum mud, sand and debris; Mist lifts use vaporized water to draw seawater in ocean thermal energy conversion systems
Vacuum technology is based on differential air pressure. Rotary vane vacuum pumps generate an operation pressure of -0.4 to -0.6 bar at the vacuum station, which is also the only element of the vacuum sewerage system that must be supplied with electricity. Interface valves are installed inside the collection chambers. They work pneumatically.
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