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2. Pressure regulator - Wikipedia

   en.wikipedia.org/wiki/Pressure_regulator

   Two types are found: The pressure reduction regulator and the back-pressure regulator. A pressure reducing regulator is a control valve that reduces the input pressure of a fluid to a desired value at its output. It is a normally-open valve and is installed upstream of pressure sensitive equipment.

3. Flow control valve - Wikipedia

   en.wikipedia.org/wiki/Flow_control_valve

   Automatic control valves do not require an external power source, meaning that the fluid pressure is enough to open and close them. Automatic control valves include pressure reducing valves , flow control valves, back-pressure sustaining valves, altitude valves , and relief valves .

4. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Pressure regulator or pressure reducing valve (PRV): reduces pressure to a preset level downstream of the valve; Pressure sustaining valve, or back-pressure regulator: maintains pressure at a preset level upstream of the valve; Presta valve, Schrader valve, or Dunlop valve, holds the air inside bicycle tires; Pulse valve, extremely fast pulsing ...

5. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   Pressure regulators are variations of valves in which flow is controlled to produce a certain downstream pressure, if possible. They are often used to control flow of gas from a gas cylinder. A back-pressure regulator is a variation of a valve in which flow is controlled to maintain a certain upstream pressure, if possible.

6. Back pressure - Wikipedia

   en.wikipedia.org/wiki/Back_pressure

   Back pressure is the term used for the hydraulic pressure required to create a flow through a chromatography column in high-performance liquid chromatography, the term deriving from the fact that it is generated by the resistance of the column, and exerts its influence backwards on the pump that must supply the flow.

7. Hospitals gave patients meds during childbirth, then reported ...

   www.aol.com/news/hospitals-gave-patients-meds...

   The drugs include morphine or fentanyl for epidurals or other pain relief, anxiety medications, and two different blood pressure meds prescribed for C-sections.