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  2. Diving cylinder - Wikipedia

    en.wikipedia.org/wiki/Diving_cylinder

    Valve ejected due to mix up with valve threads 3/4"NPSM and 3/4"BSP(F) caused damage to a dive shop compressor room. [92] A valve ejected during filling due to incompatible thread killed the operator by impact to the chest. [38] A valve failed on a diver's emergency cylinder on a diving support vessel during preparation for a dive injuring five ...

  3. Non-rebreather mask - Wikipedia

    en.wikipedia.org/wiki/Non-rebreather_mask

    The valve, along with a sufficient seal around the patient's nose and mouth, allows for the administration of high concentrations of oxygen, approximately 60% - 90% O 2. [ 2 ] [ 3 ] Many textbooks report higher oxygen concentrations, however formal studies reporting these levels are not referenced to research.

  4. Mechanism of diving regulators - Wikipedia

    en.wikipedia.org/wiki/Mechanism_of_diving_regulators

    If the cylinder pressure is 2,500 pounds per square inch (170 bar) or more, and the flow is great enough, (50 to 62.5 lpm), ice will often form inside most second stage demand regulators, even in water of 7.2 to 10 °C (45.0 to 50.0 °F) Once the water temperature drops below 4.4 °C (39.9 °F) the possibility of developing ice in the second ...

  5. Self-contained breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Self-contained_breathing...

    Demand: 2000 psi to the regulator from the main valve, plus a bypass valve in case of failure, with a two-stage regulator reducing pressure to 50-100 psi. Pressure-Demand : Similar to demand, but with a spring in the diaphragm, which holds the admission valve open, for continuous air flow to the facepiece.

  6. Flow coefficient - Wikipedia

    en.wikipedia.org/wiki/Flow_coefficient

    A simplified version of the definition is: The k v factor of a valve indicates "The water flow in m 3 /h, at a pressure drop across the valve of 1 kgf/cm 2 when the valve is completely open. The complete definition also says that the flow medium must have a density of 1000 kg/m 3 and a kinematic viscosity of 10 −6 m 2 /s, e.g. water. [clarify]

  7. Pneumatic cylinder - Wikipedia

    en.wikipedia.org/wiki/Pneumatic_cylinder

    Operation diagram of a double acting cylinder 3D-animated pneumatic cylinder Schematic symbol for pneumatic cylinder with spring return Pneumatic cylinder , also known as air cylinder , is a mechanical device which uses the power of compressed gas to produce a force in a reciprocating linear motion.

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  9. Transcatheter pulmonary valve replacement - Wikipedia

    en.wikipedia.org/wiki/Transcatheter_pulmonary...

    Transcatheter pulmonary valve replacement (TPVR), also known as percutaneous pulmonary valve implantation (PPVI), is the replacement of the pulmonary valve via catheterization through a vein. It is a significantly less invasive procedure in comparison to open heart surgery and is commonly used to treat conditions such as pulmonary atresia. [2] [3]