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2. Tremie - Wikipedia

   en.wikipedia.org/wiki/Tremie

   Various types of foot valve may be used to shut off flow while moving the pipe when pouring small volumes in disjoint areas, where it is impracticable to maintain immersion of the nozzle in the fresh concrete, as in repair work. One type is a rubber sleeve inside a section of the pipe which can be pneumatically inflated to occlude the bore over ...

3. Mechanism of diving regulators - Wikipedia

   en.wikipedia.org/wiki/Mechanism_of_diving_regulators

   Most scuba cylinder valves are currently of the K-valve type, which is a simple manually operated screw-down on-off valve. In the mid-1960s, J-valves were widespread. J-valves contain a spring-operated valve that restricts or shuts off flow when tank pressure falls to 300-500 psi, causing breathing resistance and warning the diver that he or ...

4. Valve actuator - Wikipedia

   en.wikipedia.org/wiki/Valve_actuator

   The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position. A valve actuator is the mechanism for opening and closing a valve. Manually ...

5. Fukushima nuclear accident (Unit 1 Reactor) - Wikipedia

   en.wikipedia.org/wiki/Fukushima_nuclear_accident...

   During the crisis, operators couldn't tell if one of the system's valves was open or closed. [20] About 10 minutes after the earthquake, TEPCO operators removed both of Unit 1's isolation condensers from service, and instead activated the HPCI system. At 15:07, the core spray system was activated to cool the suppression pool.

6. List of pipeline accidents in the United States in the 2000s

   en.wikipedia.org/wiki/List_of_pipeline_accidents...

   The cause was corrosion of a 1/2-inch bleeder line, that was part of a 20-inch pipeline block valve used to equalize pressure across the valve. [ 54 ] April 28 – A 14-inch diameter petroleum pipeline of Kinder Morgan Energy Partners ruptured, and spilled an estimated 103,000 gallons of diesel fuel into marshes, adjacent to Suisun Bay , in ...

7. Diving regulator - Wikipedia

   en.wikipedia.org/wiki/Diving_regulator

   A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving.The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and deliver it to the diver, but there are also other types of gas pressure regulator used for diving applications.