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Energy
Anything related to the production or supply of energy in any form.
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Energy > Natural gas 
porosity
Energy; Natural gas
A defect found in castings or welds consisting of gas bubbles or voids in the solidified metal.
position indicator
Energy; Natural gas
Any external device which visually indicates the open and closed position of valve.
positive position
Energy; Natural gas
The installation position of a multi-port valve such that the valve's flow control element is between the pressure inlet body openings and the body openings that are closed off, ...
pressure relief valve
Energy; Natural gas
A valve that automatically opens at a set fluid pressure, allows fluid to discharge, and automatically reclosed when the fluid pressure drops below the set pressure.
pressure seal joint
Energy; Natural gas
A design of body-bonnet joint that uses the fluid pressure ot compress a specially designed seal ring to form a tight seal and prevent external leakage.
pressure-temperature ratings
Energy; Natural gas
The maximum allowable working pressures at specified temperatures. For steel valves, the ratings are defined by "classes" and found in ASME B16.34. For iron and bronze valves, the ...
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