Skip to main content

Mostro Valves

Nuclear power engineering

 - Z15.1

Piston check valve Z15.1

DN 10 – 50

Technical description

Body made of closed-die forging, closed with a screwed cover. Seat in the body and sealing surface of the plug made of hard-facing alloy. Cover sealed with a graphite sealing ring. Self-acting operation. The valves can be fitted with a spring – they can then be installed in any position.

Image gallery

Drawings and dimensions

Application

The piston check valve is a self-acting valve preventing the backflow of the working medium, intended for water, steam, gases and other media used in power and chemical plants, depending on the choice of body material, for normal, tropical, explosive and seismic environments.

Operation

Testing

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

Installation

The valves are installed only in horizontal piping with the screwed bonnet on top and the flow under the plug.

Dimensions

Butt-weld ends
DNPND(max)LOVXkg
10100 - 4002715054771352,1
15
204316064961503,1
25
3261210781282107,2
40
50772509414522511,4
Flanged ends
DNPNL acc. to CSN EN 558* 4kg
101002104,3
152104,5
202308,3
252308,3
3226015,6
4010026015,6
16027018,6
250 - 40031033,0
5010026023,0
16030026,6
250 - 40035041,6

Connection

Flanged and butt-welded according to EN, ČSN, DIN, 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 128525
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
PNTemperature (°C)
20200250300350400450500520540560580600610620630640650
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 41615NiCuMoNb516Mo313CrMo4-510CrMo9-10X10CrMoVNb9-1 15 128X10CrWMoVNb9-2
016Plug discX39CrMo17,17 134X22CrMoV12-1
095Sealing ringExpanded graphite
166Screwed coverX39CrMo17,17 134X22CrMoV12-1

Other

Hotline

Do you need advice on choosing a valve, want to order spare parts or need a service visit? Call or write to us – our engineers and sales staff will be happy to help and propose the most suitable solution.