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Test results of the DN 400 regulating disc valve at SG 1 of Rovno 3

1 January 2000


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Test results of the DN 400 regulating disc valve at SG 1 of Rovno 3
Description New valve Old valve
Valve type Disc Slide
Diameter (conventional), mm 400 400
Nominal flow, t/h 1520 1520
Maximum permitted pressure differential, MPa 9.0 2.0
Drive power, kW 0.18 3.2/5.6
Speed of response, s 25 56/38
Real flow, t/h 1420 1420
Flow fluctuation, t/h up to 35 up to 40
Valve vibration, mm/s 5.0 5.7
Degree of openess (%) 72 75
Nominal pressure differential, MPa 0.70 0.70
Uncontrolled flow and leak at p = 2.3MPa (% nominal flow) 0.07 up to 4
SG level deviation in nominal mode ±12mm ±18mm
SG level deviation at main primary coolant pump #3 trip -90mm -150mm
Flow characteristic Close to linear Close to linear
Throughput (t/h) 810 645

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