Description:
| A48Y | Instruction
This valve is used for power plant boilers, pressure containers,pressure and temperature reducing devices and other facilities. It serves to ensure the safety of the device during
Structure briefing
1. The main characteristics of the spring fully bore type safety
valve are: simple structure, good seal performance, accurate opening pressure,large discharge capability, low differential reseating pressure and convenient adjustment, etc.
2. Nozzle type seat: It is the Laware nozzle type seat. The speed of the steam reaches the velocity of sound when passing the exit way of the seatl; the sealed surface of the seat at is made of hard alloy of cobalt by overlaying welding. Large discharge coefficient, fine abilites of anti friction and corrosion resistance and long durability are recognzed.
3. Thermo elastic disc: the disc is of thermo dlastic sturcture. Taking the advantage of its minor out-of shape feat-Ure when under the medium pressure, the seal ability has been raised, and the problem that pre-discharge phenomenon of the safety valve happens when the medium pressure approaching the set pressure has been overcome. The sealed surface of the disc has adopted the advanced techology of laser heat hardening to increase the hardness and the ability of anti-friction and corrosion sistance.
4.Upper adjusting ring: the valve can acquire appropriate reseating pressure by adjusting the upper adjusting ring to change the flow direc-tion of the medium discharged from the seat.
5.Lower adjusting ring: the valve can rapidly reach full bore in the discharging process by adjusting the adjusting ring.
6.Back pressure adjusting sleeve: it is an auxiliary apparatus that serves to adjust the back pressure of the disc to acquire
appropriate dif-ferential reseating pressure.
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