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967 968 969 970 - 971 - 972 973 974 975
940s 950s 960s - 970s - 980s 990s 1000s
9th century - 10th century - 11th century




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971 Series - Fisher Regulators (389 words)
The 971 Series is a 10-inch (DN 250) top-entry, pilot-operated pressure reducing regulator that uses the combination of the PRX Series and Type SA/2 pilot supply regulator as its piloting system to give a operating pressure range of 7.3 to 1015 psig (0,5 to 70 bar).
Type 971 is always used as the working regulator in single-stage pressure reduction applications and in up or downstream wide-open monitor systems.
Optional Aromatic Hydrocarbon Construction: The 971 Series is available with fluoroelastomer seat, O-rings and a specially designed diaphragm that has a PVC coating, which extends the operational life of the regulator in applications where aromatics are entrained in the gas.
Akula Class / Bars-class / Project 971 (2172 words)
The Project 971, using a steel hull, was initiated in 1976 when it became evident that existing industrial infrastructure was inadequate to mass produce the expensive titanium hulls of the Project 945 Sierra class.
The performance of the Project 971 boats was a close approximation to that of the Project 945 design, though the later was significantly more expensive to build and maintain.
The Project 971 is said by Russian sources to be at a distinct disadvantage in sensors, with a sonar suite that is roughly one-third as sensitive as the Los Angeles, able to track only two targets simultaneously (as opposed to the multiple target tracking capabilities of the American system).
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