Butterfly Spring Type Safety Valve
The valve is suitable for equipment and pipes of thermal power plant (station) that the medium is steam, used as the overpressure protection device. When the equipment and pipe internal pressure exceed the allowable value, the valve automatically opens, with full amount of emissions; when the pressure reduces to the specified value, the valve automatically and quickly shut down, to ensure the equipment and pipelines safety and effective operation.
Dimensions & constructral diagram
Butterfly spring type safety valve constructral diagram
Main performance and specifications
| type | nominal pressure | test pressure | working pressure | working temperature | test temperature | |
| sealing | intensity | |||||
| A62Y-P54100V | 10 | 11 | 15 | 10 | 540 | normal temperature |
| A62Y-P31112 | 11.2 | 12.4 | 16.8 | 11.2 | 318 | |
| A62Y-P55140V | 14 | 15.4 | 21 | 14 | 555 | |
| A62Y-P55170V | 17 | 18.7 | 25.5 | 17 | 555 | |
| A42Y-P5526V | 2.6 | 2.9 | 3.9 | 2.6 | 555 | |
| A42Y-P4545 | 4.5 | 5 | 6.8 | 4.5 | 450 | |
| A42Y-P3326.5 | 2.7 | 3 | 4.1 | 27 | 330 | |
The materials of main parts
| part name | body | bonnet | stem | butterfly spring |
| A62Y-P54100 | ZG15Cr1Mo1V | ZG25I | 38CrMoA1A | 60Si2MnA |
| A62Y-P31112V | ZG25 I | |||
| A62Y-P55140V，A62Y-P55170V，A42Y-P5526V | ZG15Cr1Mo1V | 20Cr1Mo1V1 | ||
| A42Y-P4545，A42Y-P3326.5 | ZG25 I |
External and connection dimensions
| type | diameter | dimensions | |||||||||
| DO | D | D1 | D2 | D3 | D6 | b | Z-d | H1 | H2 | ||
| A62Y-P54100V | 70/80 | 70 | - | - | 88 | 150 | - | - | - | 1575 | 347 |
| A62Y-P31112 | 70/80 | 70 | - | - | 88 | 150 | - | - | - | 1575 | 347 |
| A62Y-P55140V | 70/80 | 70 | - | - | 89 | 170 | - | - | - | 1644 | 375 |
| A62Y-P55170V | 75/100 | 75 | - | - | 100 | 190 | - | - | - | 1705 | 380 |
| A42Y-P5526V | 110/150 | 110 | 350 | 290 | - | - | 204 | 46 | 12-34 | 2067 | 480 |
| A42Y-P4545 | 110/150 | 110 | 350 | 290 | - | - | 204 | 46 | 12-34 | 2070 | 480 |
| A42Y-P3326.5 | 110/150 | 110 | 350 | 290 | - | - | 204 | 46 | 12-34 | 2067 | 480 |
