A28H Full lift safety pressure relief valve
Performance:
The allowable tolerance of the set pressure: <+/-3% of the set pressure
Overpressure:<10% of the set pressure
Blowdown:<15% of the set pressure
Tightness: the valves have good seat tightness, conforms to API527
Features:
1)The solid nozzle screws into the body. its maintenance is easy
2)The shape of the disc holder has been designed to enhance the effect of the fluid thrust for an instant lift of the disc
3)Blowdown control is provided with adjustable nozzle ring only
4)The adequate materials and clearance between disc holder and guide, spindle and adjusting screw assures disc to lift successfully.
5)The surface of both the disc and the nozle seat is depsited with STL. Excellent flatnes and surface finish of the seating surfaces by precision machining and lapping assure safety valve to have high degree of seal tightness and long usage
6)The bllows of balanced bellows safety valve not only can avoid and effect of variable back pressure in the system, but also can protect spring and other trim components from corrosive media
7) The choice of material is careful. The manufacture of the spring and the bellows has strict technological process. Each of them is tesed and checked strictly.
| A28H-10 A28Y-10P A28Y-10R8 A28Y-25R8 A28Y-40R8 A28H-16 A28Y-16P A28Y-16R8 A28Y-25R8 A28Y-40R8 |
| A28H type are used for the equipment and pipeline of the air, N2, H2 mixed gas vapour etc.medium what the working temp-erature are less than 200 . A28Y-P/10R8 type are used for the equipment and pipeline of the quality with corrode medium what the working temperature are less than 200 . Take for extra pressure protedion devices. |
| Explanation of materials for main parts |
| NO. |
Name of part |
A28H Materials |
A28Y-P Materials |
A28Y-R8 Materials |
| 1 |
Body |
HT200 |
ZG1Cr18Ni9Ti |
CF8M |
| 2 |
Nozzle |
35 |
ZG1Cr18Ni9Ti |
CF8M |
| 3 |
Adjusting ring |
2Cr13 |
1Cr18Ni9Ti |
316 |
| 4 |
Disc |
2Cr13 |
1Cr18Ni9Ti |
316 |
| 5 |
Spring |
50CrVA |
50CrVA Coated Teflon |
50CrVA Coated Teflon |
| 6 |
Stem |
2Cr13 |
2Cr13 |
316 |
| 7 |
Adjusting bolt |
45 |
2Cr13 |
316 |
| 8 |
Cap |
ZG200-400 |
ZG200-400 |
CF8M |
| |
Sealing surface of material |
D507
Depositing D507 |
Co
Depositing stellite |
| 10 |
Adjusting nut |
Q235-A |
2Cr13 |
1Cr18Ni12Mo2Ti |
| |
Sealing surface of material |
"Y" Co Depositing stellite, "H" D507 Depositing D507, "W" body |
| Dimensions (mm) |
Nominal diameter
DN (mm) |
Dimensions (mm) |
| do |
Rc |
G |
L |
L1 |
H |
| 15 |
10 |
1/2" |
3/4" |
37 |
62 |
189 |
| 20 |
12 |
3/4" |
1" |
40 |
65 |
196 |
| 25 |
15 |
1" |
11/ "
4 |
45 |
72 |
277 |
| 32 |
20 |
11/ " |
1 |
55 |
85 |
312 |
| 40 |
25 |
11/ " |
2" |
67 |
100 |
322 |
| 50 |
32 |
2" |
21/ "
2 |
76 |
112 |
348 |
| 65 |
40 |
21/ " |
3" |
110 |
135 |
370 |
| 80 |
50 |
3" |
4" |
110 |
145 |
410 |
Factory Corner
Test & Inspection
FAQ
Q.
Are you a trading company or a manufacturer?
A: We are a manufacturer as you can see our workshop as above.
Q.
What is your payment term?
A:Normally T/T 30% in advance, balance to be paid before delivery.
Q:
What is your main market?
A:North America,Greenland,South America,Africa,Southeast Assia, Former Soviet Republics ,East Assia,and Europe.
Q:
Can I place sample order to your factory?
A: Yes, Samples can be provided.
Q:
What kind of trade terms can you do?
A:EX-WORKS,FOB,CFR,CIF,etc.
Q:
How long is your delivery time?
A: Generally it is 5-7 days if the goods are in stock. Or it is 15-20 days if the goods are not in stock, it is accordijng to quantity.
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