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To allow the construction of hybrid systems, where the 4–20 mA is generated by the controller, but allows the use of pneumatic valves, a range of current to pressure (I to P) converters are available from manufacturers. These are usually local to the control valve and convert 4–20 mA to 3–15 psi (or 0.2–1.0 bar).
On civil turbofans, the first stage of the LP compressor is often a single-stage fan. If the HP compressor pressure ratio exceeds about 4.5:1, then the unit will probably have variable geometry (i.e. variable stators) on the first few stages, to make the surge line on the compressor map more shallow, to accommodate the shallow working line.
Within industry, a 250 HP rotary-screw compressor is generally considered to be a compact piece of equipment. Rotary-screw compressors are commonly available in the 5 through 500 HP range and can produce air flows in excess of 2500 SCFM.
The 1970s saw Joy compressors grow in the US domestic market with much focus on engineered custom compressors for refineries and air separation. Joy centrifugal compressors are operated in dozens of applications throughout the world and are integral to the following industries: auto, glass, textiles, petrochemical, snow making, electronics ...
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TO 00-20-14 Technical Manual Air Force Metrology and Calibration Program (PDF). 30 September 2011 Retrieved 23 January 2014 . This Technical Order (TO) ... implements AFI 21-113, Air Force Metrology and Calibration (AFMETCAL) Management .