Cast iron low lift safety valve is widely used in petroleum, gas, electricity, chemical industry, etc. It is applicable for water, steam, gas, oil or corrosive medium. The valve is made of WCB, CF8, CF8M, CF3M. When the pressure in pipes is higher than set pressure, safe valve will open to decompress to ensure the safety of pipes. When the pressure in pipes is lower than set pressure, safety valve will close.
Characteristics of bellows balanced safety valve
1. Fully opened structure has large emissions.
2. Bellows are made of stainless steel to ensure zero leakage.
3. The structure of disc and base is convenient for maintenance.
4. Spring is made of high quality spring steel to enhance service life and stability.
5. Backpressure at the exit of balanced safety valve can ensure the accuracy of pressure.
Parameter
|
Nominal Diameter(mm) |
DN20-DN400 |
|
Applicable Temperature |
≤200°C |
|
Applicable Medium |
Water, oil, steam, corrosive medium |
Materials
|
Base |
2Cr13, CF8, CF8M, CF3M |
|
Body |
WCB, CF8, CF8M, CF3M |
|
Adjusting ring |
2Cr13, 304SS, 316SS,316L |
|
Disc holder |
2Cr13, 304SS, 316SS,316L |
|
Disc |
2Cr13, 304SS, 316SS,316L |
|
Bellows |
304SS, 316SS,316L |
|
Guide sleeve |
2Cr13, 304SS, 316SS,316L |
|
Bonnet |
WCB, CF8, CF8M, CF3M |
|
Spring |
50CrVa, 50CrVa+TEFLON |
|
Stem |
2Cr13, 316SS,316L |
|
Stretching screw |
45#steel, 2Cr13 |
|
Cover |
ZG200 |
|
Seal face |
Cemented carbide |
Dimensions
|
Nominal Pressure PN |
Nominal Diameter DN(mm) |
do |
DN |
L |
L1 |
≈H |
|
1.6MPa |
20 |
15 |
25 |
110 |
95 |
378 |
|
25 |
16 |
32 |
110 |
95 |
378 |
|
|
32 |
20 |
40 |
115 |
100 |
378 |
|
|
40 |
25 |
50 |
120 |
110 |
406 |
|
|
50 |
32 |
65 |
135 |
120 |
450 |
|
|
65 |
40 |
80 |
160 |
140 |
520 |
|
|
80 |
50 |
100 |
170 |
135 |
525 |
|
|
100 |
65 |
125 |
195 |
175 |
690 |
|
|
125 |
80 |
150 |
210 |
190 |
780 |
|
|
150 |
100 |
175 |
255 |
230 |
838 |
|
|
200 |
125 |
250 |
300 |
260 |
992 |
|
|
250 |
150 |
300 |
350 |
320 |
1266 |
|
|
300 |
220 |
400 |
370 |
350 |
1283 |
|
|
350 |
250 |
500 |
500 |
450 |
1520 |
|
|
400 |
280 |
500 |
500 |
450 |
1530 |
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