A69Y Main Safety Valve(W Series) Welding Safety Valve
manufacturer: Shanghai MeiYan Yi Pump & Valve Co., Ltd.
Eml: sales@1bengfa.com
Tel: +86 (21) 5640 2009
Mob: +86 138 1691 3072（WeChat Same Account）
Applications and structure descriptions
A69Y main safety valve is used for steam pressure P = 10MPa, temperature t = 540 ℃ power plant boiler, to prevent the boiler medium pressure exceeds allowable value, in order to ensure the safe operation of the boiler. The main structural features of A69Y main safety valve are: 1, the valve is double exhaust, both ends are flange connection structure. It mainly consist of body, connecting pipe, the buffer container, piston room, disc, stem and other parts. 2, when the medium pressure rises to the set pressure, the impulse safety valve opens, medium enters into the piston room from the pulse pipe, pushs the piston down, so the valve automatically opens, when the impulse valve is closed, the disc shuts down automatically. 3, sealing surface is made of Co-based hard alloy bead welding, after heat treatment, the disc improves hardness.
Dimensions & constructral diagram
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A69Y main safety valve constructral diagram
External and connection dimensions(mm)
| Type | Nominal diameter DN | Connecting dimensions | ||||||||||
| L | L1 | H | D | D1 | DN’ | D’ | D1’ | D2’ | b’ | Z-Фd | ||
| A69Y-P455.3V | 150 | 560 | 638 | 698 | 220 | 165 | 150 | 300 | 250 | 204 | 30 | 8-25 |
| A69Y-P466.7V | 150 | 560 | 638 | 698 | 220 | 165 | 150 | 300 | 250 | 204 | 30 | 8-25 |
| A69Y-P5410V | 150 | 560 | 638 | 698 | 220 | 165 | 150 | 300 | 250 | 204 | 30 | 8-25 |
| A69Y-P5410.5V | 150 | 560 | 638 | 698 | 220 | 165 | 150 | 300 | 250 | 204 | 30 | 8-25 |
Installation instructions
1.A69Y main safety valve must be installed perpendicular to the highest position of the device.
2.A69Y main safety valve should be fastened to the support, the support bears the counterforce produced by main safety valve exhaust.
3.exhaust pipe should have special cradle, exhaust pipe weight shall not be added to the main safety valve, the connecting flange between A69Y main safety valve and the exhaust pipe should eliminate any additional prestressing.
4.the lowest point of exhaust pipe should be considered drainage, to avoid producing water hammer when exhausting steam.
