Description:
Instruction
This valve is used for power plant boilers,pressure containers,pressure and temperature reducing devices and other facilities.
Structure briefing
1. The safety valve shall be installed wertically and it would be
better to install the valve directly upon the adaptor of the contcuner or the pipe. The inside diameter of the adapfor shall be no less than that of the inlet pipe of the softy valve.
2. To avoid the thermal stress that is caused by the thermal expansion of the discharge pipe, the exit way of the safaty valve shall be expansion with appropriate expansion joint. The inside diameter of the discharge pipe should larger than the diameter
of the exit way of the valve. Its length shall be as short as possible and no bent is allowed. The weight of both the discharge pipe and the expansion joint shall not be applied to the safety valve, and they shall be fastened upon the con-struction. The distance between both centerlines of the discharge pipe and the body shall be as short as possible. A water drainage pipe shall be installed separately for each safety valve.
3. The exit way of the muffler shall have enough area, in order to avoid producing back pressure that would affect the discharge
capability of the valve.
| A48Y |
| A48Y-C 型适用于温度≤425℃； A48Y-V型适用于温度≤550℃的电站锅炉、压力容器、减温减压装置上，作为超压保护装置。 |
| A48Y-C type applicable temperature are less than 425℃; A48Y-V type is suitable for the exceeding pressure protective equipment, their working temperature is 550℃ or less. Such as the boiler used in powerstation,pressure ontainer,pressure reducing and temperature reducing machine. |
| 主要外形及连接尺寸 Main external and connecting dimensions |
| Type |
DN Nominal diameter |
Connecting dimensions (mm) |
| L |
L1 |
H |
D |
D1 |
D2 |
b |
Z- d |
DN1 |
D' |
D1' |
D2' |
b' |
Z1- d1 |
| A48Y-P543.82V |
65 |
190 |
190 |
853 |
220 |
170 |
110 |
50 |
8-25 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-10 |
80 |
190 |
190 |
853 |
230 |
180 |
121 |
50 |
8-25 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-10 |
65 |
190 |
190 |
853 |
220 |
170 |
110 |
50 |
8-25 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-P543.82V |
80 |
190 |
190 |
853 |
230 |
180 |
121 |
50 |
8-25 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-20 |
65 |
210 |
210 |
933 |
260 |
203 |
97 |
55 |
8-30 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-P545.29V |
65 |
210 |
210 |
933 |
260 |
203 |
97 |
55 |
8-30 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-20 |
80 |
210 |
210 |
933 |
260 |
203 |
116 |
60 |
8-34 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-P545.29V |
80 |
210 |
210 |
933 |
290 |
230 |
116 |
60 |
8-34 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-20 |
80 |
210 |
210 |
933 |
290 |
230 |
116 |
60 |
8-34 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-P5410V |
80 |
210 |
210 |
933 |
290 |
230 |
116 |
60 |
8-34 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-20 |
65 |
210 |
210 |
933 |
290 |
230 |
116 |
60 |
8-34 |
150 |
300 |
250 |
204 |
30 |
8-25 |
| A48Y-P5410V |
65 |
210 |
210 |
933 |
290 |
230 |
116 |
60 |
8-34 |
150 |
300 |
250 |
204 |
30 |
8-25 |
1. Tianzheng Brand safety valve is noted for elegant design,
no leakage, setting pressure precision, greatly discharge and easily adjusted.
2. Nozzle seat: It is the Loware nozzle type seat. The steam reaches the velocity of sound when passing the exit way of the seat. The sealing surface is welded by cobalt hard alloy, Large displac- ement coefficient, anti-friction, corrosion resistance and long durability are recognized
3. Thermo elastic disc: the disc is of thermo elastic structure. Taking the advantage of its minor out-of -shape feature when under the medium pressure, the seal ability has been raised, and the problem that pre -discharge phenomenon of the main safety happens when the medium pressure approaching the set pressure has been overcome. The sealed surface of the disc has adopted the advanced technology of heat hardening to increase the hardness and the ability of anti-friction and corrosion resistance.
4. Adjusting nut: adjust the compression amount of spring by suing pet nut so that the valve can acquire appropriate set pressure rapidly and easily.
5. Back pressure adjusting sleeve: it is an auxiliary apparatus that serves to adjust the back pressure of the disc to acquire appr- opriate dif-ferential pressure for seat returning. If adjust upward, the back pressure of valve reduces. If adjust downward, the back
pressure rises.
Installation instruction
