primary valve
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valve — A device used to either open or close an opening to allow or prevent the flow of a liquid or gas from one place to another. There are many different types. See ABS relay valve accumultor valve air valve carburetor air control valve air gulp valve … Dictionary of automotive terms
Primary interatrial foramen — Interior of dorsal half of heart from a human embryo of about thirty days. (Ostium primum visible below septum primum, but not labeled.) Latin … Wikipedia
Primary isolate — is a pure microbial or viral sample that has been obtained from an infected individual, rather than grown in a laboratory. In chemistry and bacteriology, the verb isolate means to obtain a pure chemical, bacteriological or viral sample. The noun… … Wikipedia
Primary tumors of the heart — The primary tumors of the heart are tumors that arise from the normal tissues that make up the heart. This is in contrast to secondary tumors of the heart, which are typically either metastatic from another part of the body, or infiltrate the… … Wikipedia
Valve amplifier — A valve amplifier or tube amplifier is a type of electronic amplifier that make use of vacuum tubes instead of solid state semiconductor devices (such as transistors). As any other electronic amplifier they serve to increase the power and/or… … Wikipedia
Valve audio amplifier - technical — Circuitry and performance Characteristics of valves Valves are very high input impedance (near infinite in most circuits) and high output impedance devices. They are also high voltage / low current devices.While valves themselves are described… … Wikipedia
Primary Life Support System — A Primary (or Portable) Life Support System/Subsystem, or PLSS, is the backpack of a spacesuit. It provides most of the functions of a spacecraft life support system, in a smaller package. The functions performed by the PLSS include: *regulating… … Wikipedia
Posterior urethral valve — Classification and external resources Vesiculæ seminales and ampullæ of ductus deferentes, seen from the front. Posterior urethral valves are at the dorsal aspect (back) of the prostatic urethra. DiseasesDB … Wikipedia
pressurization and dump valve — A valve used in a turbine engine fuel system equipped with duplex nozzles. When the demand for fuel is low, it flows through the primary manifold. The pressurization valve opens at a high fuel flow to deliver fuel to the secondary manifold. At… … Aviation dictionary
Check valve — Tilting disc inconel check valve … Wikipedia
