Location:Home / Product / Safety valve / Safety overflow valve AY42H/HA802Y
This valve serves as a pressure relief protection in the system. When the system pressure exceeds the specified value, the valve opens and releases a portion of the gas in the system into the atmosphere, ensuring that the system pressure does not exceed the allowable value and preventing accidents due to excessive pressure. The main parameter of this valve is displacement, which is determined by the diameter of the valve seat and the opening height of the valve disc. Depending on the opening height, it can be divided into two types: micro opening and full opening. Micro opening refers to the opening height of the valve disc being 1/40-l/20 of the valve seat throat diameter. Full opening refers to the opening height of the valve disc being 1/4 of the valve seat throat diameter. This valve is suitable for urban construction, chemical industry, metallurgy, petroleum, pharmaceuticals, food, beverage, and environmental protection.
Product drawing

Product dimensions
| model | Nominal Diameter | size | |||||||||
| DN | D | D1 | K | M | Z-Ød | b | L | L1 | Rc | ≈H | |
AY42H-160/250/400 | 15 | 135 | 95 | 25 | M48×2 | 4×22 | 25 | 65 | 140 | 1" | 329 |
| 20 | 165 | 115 | 30 | M52×2 | 6×26 | 28 | 80 | 150 | 1 1/2" | 447 | |
| 25 | 200 | 145 | 38 | M80×3 | 6×29 | 40 | 90 | 180 | 2" | 485 | |
| 32 | 225 | 170 | 42 | M100×3 | 6×-33 | 50 | 100 | 200 | 2 1/2" | 570 | |
| model | Nominal Diameter | size | ||||
| DN | Rc | ZG | L | L1 | ≈H | |
| YA802Y-600 | 15 | 1/2" | 1/2" | 52 | 90 | 250 |
| 25 | 1" | 1" | 52 | 113 | 275 | |
| 40 | 11/2" | 11/2" | 52 | 157 | 336 | |
Technical Documentation
1.execution standard:GB/T 12243-2021
2.Structural length standard:GB/T12221-2005
3.Flange Standard:GB/T9113.1-2000
4.Test Standard:GB/T13927-2022
Product Parts List
| serial number | name | material |
| 1 | valve body | carbon steel |
| 2 | valve seat | stainless steel |
| 3 | valve disc | stainless steel |
| 4 | valve cover | welded assembly |
| 5 | spring | 50CrVA |
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