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Mostro Valves

Nuclear power engineering

 - L10

Swing check valve L10

DN 65 – 400

Technical description

Body made of closed-die or open-die forging. Seat pressed into the body and secured with a seal weld. Sealing surfaces of the seat and disc hard-faced with a hard-facing alloy. Pressure seal bonnet sealing ring made of expanded graphite. Self-acting operation.

Image gallery

Drawings and dimensions

Application

The swing check valve is a self-acting valve preventing the backflow of the working medium, intended for water, steam and other media used in power and chemical plants, for normal, tropical and explosive environments.

Operation

Testing

The valves are tested with water (or steam at the customer's request) for strength, body tightness and seat tightness depending on the operating parameters and body material. The minimum test pressure for the strength test is 1.5 times PN. Pressure-bearing welds are radiographed.

Installation

The valves are installed only in horizontal piping with the pressure seal bonnet on top and the flow directed under the disc.

Dimensions

Butt-weld ends
DNPNAD maxHLVkg
65/55160 ÷ 400160777036018020,5
65/5021
80/751901209545024043
100/7512045
125/11025017012850032084
150/110230550144
175/125325230155650390160
175/150230165
200/150220178
225/175385250185700450240
250/200430310205800490337
275/200310850392
250/225485350235800550370
275/225350850417
300/225350900485
300/25066036530010007701270
350/2754051375
Flanged ends
DN/dPNAL acc. to CSN EN 558* 4Vkg
65/5016016036018061
65/5025042569
80/7525019047024095
100/75550125
125/110250650320184
150/110750227
200/150325950390557
250/20043011504901032
300/22516048513505501373

Connection

Flanged and butt-welded according to ČSN, DIN, EN, ANSI and GOST standards.

Comparison table of Czech and EN materials

Comparison table of Czech and EN materials
Czech material classCSN standardW.NrEN material class
11 416ČSN 41 16001.0425P 265 NH
15 128ČSN 41 51281.771514 MoV6-3
17 119ČSN 41 71191.4903X10CrMoVNb9-1
17 246, 17 248ČSN 41 7246 (48)1.4541X6CrNiTi18-10
15 020ČSN 41 50201.541516Mo3
15 121ČSN 41 51211.733513CrMo4-5

Documentation

Operating parameters

Operating parameters – PN (bar) depending on temperature (°C) and body material
PNTemperature (°C)
20200250300350400450500520540560580600610620630640650
11 416
636,36,35,54,84,13,52
10010108,87,66,55,63,2
160161614,112,210,595,1
250252522,019,116,414,28,1
32032322825211815
40040403531262318
C22.8
636,35,64,94,23,62,92,1
100108,97,86,65,84,63,4
1601614,312,510,69,27,45,5
2502522,419,516,614,411,58,7
3203228,725,021,318,514,811,1
4004035,931,326,623,118,513,9
P 285 NH
636,35,44,73,62,92,2-
100108,57,45,74,53,4-
1601613,611,99,17,25,5-
2502521,318,614,211,38,6-
15 128
636,36,15,24,42,8
100109,88,27,04,5
1601615,613,39,07,2
2502524,420,714,011,3
3203231241915
4004039302318
16Mo3 / 15Mo3
636,36,05,25,14,94,73,32,1
100109,58,48,17,87,55,33,4
1601615,313,412,912,5128,65,4
2502523,92120,219,518,813,48,5
3203231272625241711
4004038343331302214
13CrMo4-5
636,36,05,84,64,12,81,81,2
100109,59,28,77,95,43,52,3
1601615,314,814,312,78,75,63,7
2502523,923,122,419,813,68,85,8
320323130282717117,4
400403837353422149,3
10CrMo9-10
636,34,93,72,82,11,61,2
100107,85,94,53,32,51,9
1601612,59,57,25,34,03,1
2502519,514,911,38,46,34,9
32032252015118,26,3
4004032251814107,9
X10CrMoVNb9-1
636,35,24,23,2
100108,46,65,2
1601613,410,68,3
250252116,613
32032282217
40040352822
X6CrNiTi18-10
636,35,75,354,74,64,44,34,34,34,33,93,1
100109,08,47,97,57,27,06,96,96,86,76,25
1601614,413,412,612,011,611,311,011,010,910,89,98
2502522,421,019,718,818,117,517,317,317,217,115,512,5
X10CrWMoVNb9-2
320323226211916141210
400404033262320171513

Materials of main parts

Materials of main parts by operating temperature (°C)
Pos.Part identificationOperating temperature (°C)
450530550560570600650
002BodyP 250 GH P 285 NH 11 41615NiCuMoNb516Mo313CrMo4-510CrMo9-10 15 128X10CrMoVNb9-1X10CrWMoVNb9-2
003Extender
004SeatP250GH P 285 NH 11 416
014Pressure seal bonnet10CrMo9-1010CrMo9-10
039Segmented ring
038Spacer ring
041Pressure seal nutE335,11 60010CrMo9-10
054Pressure-tight sealingExpanded graphite

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