Technical description
Body made of closed-die forging with offset or coaxial (formerly C 23) ends, with a screwed bonnet, joined by a threaded joint. Seat in the body and sealing surface of the plug hard-faced with a cobalt-free hard-facing alloy. Body sealed with a sealing ring made of asbestos-free material. Self-acting operation. Supplied according to special technical specifications.
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Drawings and dimensions
Application
Self-acting valve preventing the backflow of the working medium, intended for radioactive water, steam, gases and other media, particularly in primary, secondary and auxiliary circuits of nuclear power plants and chemical plants, for installation inside or outside the containment, seismically resistant.
Operation
Testing
The valves are tested with demineralised water for strength and tightness at a minimum of 1.6 times Pp, for seat tightness at Pp and for vacuum tightness with helium at a vacuum of 5·10⁻¹ Pa. No indication greater than 1·10⁻⁵ Pa·l·s⁻¹ is permitted. The body-to-bonnet weld is inspected by radiography and ultrasound.
Installation
The valves are installed only in horizontal piping with the screwed bonnet on top and the flow under the plug.
Connection
Butt-welded according to ČSN and GOST standards.
Documentation
Operating parameters
| Pp (MPa) | Temperature (°C) | ||||||
|---|---|---|---|---|---|---|---|
| 250 | 275 | 300 | 250 | 300 | 335 | 350 | |
| Body material | |||||||
| 12 020 | 08Cr18Ni10Ti | ||||||
| Operating pressure MPa | |||||||
| ÷ 20 | 2,5 | - | 8,6 | 2,5 | 9,2 | - | - |
| 4 | 6 | 9,2 | 4 | 11 | 14 | 18 | |
| 12 | - | 11 | - | 20 | - | - |
Materials of main parts
| Pos. | Part identification | Material | |
|---|---|---|---|
| 166 | Screw cover | 08Х18Н10Т | |
| 095 | Sealing ring | Exp. graphite | |
| Hard facing | TYPE C1111 | ||
| 016 | Plug disc | 08Х18Н10Т | |
| Hard facing | TYPE C1111 | ||
| 002 | Body | 12020 | 08Х18Н10Т |
Dimensions
| DN | Pp (MPa) | O | D (max) | H | L | C | V | kg |
|---|---|---|---|---|---|---|---|---|
| 10 15 | ÷ 20 | 50 | 25 | 40 | 130 | 24 | 74 | 1,7 |
| 20 25 | 60 | 37 | 58 | 160 | 35 | 86 | 3,2 | |
| 32 40 | 66 | 45 | 71 | 180 | 45 | 106 | 4,6 | |
| 50 | 102 | 65 | 115 | 230 | 70 (66) | 160 | 13,5 |
| DN | Pp (MPa) | O | D (max) | H | L | V | kg |
|---|---|---|---|---|---|---|---|
| 10 15 | ÷ 20 | 50 | 25 | 30 | 160 | 86 | 1,8 |
| 20 25 | 60 | 35 | 40 | 103 | 3,2 | ||
| 32 40 | 66 | 48 | 55 | 260 | 126 | 5,4 |
Other
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