Wenzhou Starry Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of safety valve for steam in China. We are committed to providing high quality customized valves with low price. If you're going to buy bulk durable safety valve for steam, welcome to get quotation from our factory.
| Size Range | DN20 ~ DN200 (1" ~ 8") |
| Pressure Class | Class150, 300, 600, 900, 1500, 2500 (ASME B16.5 pound-grade) |
| Connection Type | Flanged, inlet & outlet comply with ASME B16.5 standard |
| Body Material | A216-WCB, A217-WC6, A217-WC9 for high-temperature working condition |
| Operation Type | Spring-loaded, Open bonnet, Full-lift, equipped with manual test lever, angle pattern |
| Lifting Height | ≥1/4 of nozzle diameter (Full-lift design for high-capacity steam relief) |
| Execution Standard | API 520, API 526, API 527, ASME Sec.VIII, GB/T12243-2021 |
| Structural Feature | Open bonnet with heat radiator structure, external manual operating lever, adjustable nozzle ring, Stellite hard-alloy overlay sealing pair. Outlet flange is larger than inlet flange for large-capacity steam discharge. Suitable for high-temperature boiler and power station steam system. |
| Suitable Media | Saturated steam, superheated steam, air and other non-corrosive gaseous media. Widely used for power plant boiler, steam header, high-temperature pressure vessels and steam pipeline over-pressure protection. |
Features
Adopts open bonnet plus integrated radiator fin structure, effectively isolate high-temperature steam heat transfer to pressure spring. Prevent spring performance degradation caused by overheating, guarantee stable set-pressure performance under long-term superheated steam working environment, specially optimized for power station high-temperature steam condition.
Standard full-lift structure with back-blow disc, lifting height ≥1/4 nozzle diameter. Instant full-opening once reaching set pressure, achieves large-capacity rapid relief. Adjustable nozzle ring can fine-tune blow-down value to meet different project technical requirements, fully comply with API 520 capacity calculation criteria.
Built-in external manual operating lever. When system pressure reaches above 75% of set pressure, onsite operator can perform manual lifting test to verify valve flexibility, avoid valve stuck caused by long-term standby. Convenient for regular inspection of boiler and power station safety accessories.
Nozzle and disc seating surface overlaid with Stellite hard alloy. Excellent high-temperature anti-erosion and wear-resistant property. Tightness performance meets API 527 seat-leakage standard, maintain reliable tight shut-off under high-temperature steam cyclic relief service, extend service cycle between maintenance.
Pure spring-driven mechanical structure without external power supply. Set pressure can be precisely adjusted on-site. Automatically opens for over-pressure relief; reseats tightly when system pressure drops to qualified blow-down range. Stable performance, convenient for routine maintenance for power & petrochemical plants.
Typical Application Equipment
- Power-plant boiler, steam drum and superheated steam pipeline system
- Industrial high-temperature steam header and steam pressure vessels
- Petrochemical high-temperature heat-exchanger and steam process equipment
- Energy-generation equipment requiring API-standard pound-grade safety accessory
- Steam system with regular manual-test requirement for safety valves
Working Principle & Application Notes
Safety valve for steam is API-compliant spring-loaded relief valve for high-temperature steam service. Open bonnet with radiator fin dissipates heat to protect spring assembly. Manual lever enables on-site functional test. Full-lift back-blow-disc realizes large-capacity rapid steam discharge. Temperature shall not exceed material temperature rating. Safety valve for steam is designed for steam & non-corrosive gas; not applicable for H₂S sour-service without NACE-qualified material upgrade. Customer shall provide set-pressure, operating temperature and steam flow-rate for correct sizing before order.
Main Property and Specifiecation
|
Normal Pressure |
PN |
150 |
300 |
600 |
900 |
1500 |
2500 |
|
Body strangth |
Ps(MPa) |
3 |
7.5 |
15 |
22.5 |
38 |
63 |
|
Set pressure |
Pk(MPa) |
0.1-2 |
1.6~5 |
3.2-10 |
8~15 |
10~25 |
16~40 |
|
Seal pressure |
Pm |
90%Pk |
|||||
|
Reseation pressure |
Ph |
≥90%Pk |
|||||
|
Relieving pressure |
Pp |
≤1.03 Pk |
|||||
|
Llift |
H(mm) |
≥1/4d0 |
|||||
|
Appropriate temperature |
C |
≤425℃ |
|||||
|
1 |
≤510℃ |
||||||
|
v |
≤540℃ |
||||||
|
Appropriate medium |
Steam |
||||||
Code Of Throat Diameter
|
Code |
Diameter |
Code |
Diameter |
|
D |
10 |
L |
50 |
|
E |
13 |
M |
55 |
|
F |
16 |
N |
60 |
|
G |
20.5 |
P |
72 |
|
H |
26 |
Q |
96 |
|
J |
33 |
R |
115 |
|
K |
40 |
T |
148 |
Safety Valve For Steam Main Dimension
|
A48SC150,A48SC1501,A48SC150V |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
d0 |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN |
D |
D1 |
D2' |
b' |
t' |
Z-φd |
L |
L1 |
H |
|
|
1/2"×3/4 |
D |
89 |
60.5 |
35 |
12 |
5 |
4-15 |
20 |
98 |
70 |
43 |
14 |
1.6 |
4-15 |
90 |
90 |
380 |
|
3/4"×1" |
D |
98 |
70 |
43 |
14 |
5 |
4-15 |
25 |
108 |
79.5 |
51 |
15 |
1.6 |
4-15 |
96 |
92 |
390 |
|
1"×11/2" |
D |
108 |
79.5 |
51 |
15 |
5 |
4-15 |
40 |
127 |
98.5 |
73 |
18 |
1.6 |
4-15 |
115 |
105 |
395 |
|
1"×2" |
D |
108 |
79.5 |
51 |
15 |
5 |
4-15 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
115 |
105 |
395 |
|
11/2"×2" |
G |
127 |
98.5 |
73 |
18 |
5 |
4-15 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
121 |
124 |
420 |
|
11/2×21/2" |
G |
127 |
98.5 |
73 |
18 |
5 |
4-15 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
121 |
124 |
420 |
|
11/2×3" |
G |
127 |
98.5 |
73 |
18 |
5 |
4-15 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
430 |
|
2"×21/2" |
H |
152 |
120.5 |
92 |
18 |
5 |
4-19 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
124 |
130 |
460 |
|
2"×3" |
J |
152 |
120.5 |
92 |
18 |
5 |
4-19 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
460 |
|
21/2"×4" |
J |
178 |
139.5 |
105 |
20 |
5 |
4-19 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
143 |
137 |
480 |
|
3"×4" |
L |
190 |
152.5 |
127 |
22 |
5 |
4-19 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
162 |
156 |
530 |
|
4"×6" |
N |
229 |
190.5 |
157 |
24 |
10 |
8-19 |
150 |
279 |
241.5 |
216 |
26 |
1.6 |
8-22 |
210 |
197 |
610 |
|
6"×8" |
P |
279 |
241.5 |
216 |
26 |
10 |
8-22 |
150 |
279 |
241.5 |
216 |
26 |
1.6 |
8-22 |
241 |
240 |
780 |
|
8"×10" |
R |
343 |
298.5 |
270 |
29 |
10 |
8-22 |
250 |
406 |
362 |
324 |
31 |
1.6 |
12-25 |
279 |
276 |
840 |
|
12"×14" |
T |
483 |
432 |
381 |
32 |
10 |
12-25 |
350 |
533 |
476 |
413 |
35 |
1.6 |
12-28 |
370 |
360 |
980 |
|
A48SC300,A48SC3001,A48SC300V |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
d0 |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN' |
D' |
D1' |
D2' |
b' |
t |
Z-φd |
L |
L1 |
H |
|
|
1/2"×3/4 |
D |
95 |
66.5 |
35 |
15 |
5 |
4-15 |
20 |
98 |
70 |
43 |
14 |
1.6 |
4-15 |
90 |
90 |
380 |
|
3/4"×1" |
D |
117 |
82.5 |
43 |
16 |
5 |
4-19 |
25 |
108 |
79.5 |
51 |
15 |
1.6 |
4-15 |
96 |
92 |
390 |
|
1"×11/2" |
D |
124 |
89 |
51 |
18 |
5 |
4-19 |
40 |
127 |
98.5 |
73 |
18 |
1.6 |
4-15 |
115 |
105 |
395 |
|
1"×2" |
D |
124 |
89 |
51 |
18 |
5 |
4-19 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
115 |
105 |
395 |
|
11/2"×2" |
F |
156 |
114.5 |
73 |
20 |
5 |
4-22 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
121 |
124 |
420 |
|
11/2×21/2" |
F |
156 |
114.5 |
73 |
20 |
5 |
4-22 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
121 |
124 |
420 |
|
11/2×3" |
F |
156 |
114.5 |
73 |
20 |
5 |
4-22 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
430 |
|
2"×21/2" |
H |
165 |
127 |
92 |
22 |
5 |
8-19 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
124 |
130 |
460 |
|
2"×3" |
H |
165 |
127 |
92 |
22 |
5 |
8-19 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
460 |
|
21/2"×4" |
J |
190 |
149.5 |
105 |
24 |
5 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
143 |
137 |
480 |
|
3"×4" |
L |
210 |
168 |
127 |
28 |
5 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
162 |
156 |
430 |
|
4"×6" |
N |
254 |
200 |
157 |
32 |
10 |
8-22 |
150 |
279 |
241.5 |
216 |
26 |
1.6 |
8-22 |
210 |
197 |
610 |
|
6"×8" |
P |
318 |
270 |
216 |
38 |
10 |
12-22 |
200 |
343 |
298.5 |
270 |
29 |
1.6 |
8-22 |
241 |
240 |
780 |
|
8"×10" |
Q |
381 |
330 |
270 |
42 |
10 |
12-22 |
250 |
406 |
362 |
324 |
31 |
1.6 |
12-25 |
279 |
276 |
840 |
|
A48SC600,A48SC600I,A48SC600V |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
d0 |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN' |
D |
D1 |
D2' |
b' |
t |
Z-中d' |
L |
L1 |
H |
|
|
3/4"×1" |
D |
117 |
82.5 |
43 |
16 |
7 |
4-19 |
25 |
108 |
79.5 |
51 |
15 |
1.6 |
4-15 |
96 |
92 |
400 |
|
1"×2" |
D |
124 |
89 |
51 |
19 |
7 |
4-19 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
115 |
105 |
420 |
|
11/2"×2" |
F |
156 |
114.5 |
73 |
22 |
7 |
4-22 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
152 |
124 |
440 |
|
11/2×21/2" |
F |
156 |
114.5 |
73 |
22 |
7 |
4-22 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
152 |
124 |
440 |
|
11/2×3" |
F |
156 |
114.5 |
73 |
22 |
7 |
4-22 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
152 |
124 |
450 |
|
2"×21/2" |
H |
165 |
127 |
92 |
26 |
7 |
8-19 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
162 |
154 |
480 |
|
2"×3" |
H |
165 |
127 |
92 |
26 |
7 |
8-19 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
162 |
154 |
480 |
|
21/2"×4" |
H |
190 |
149.5 |
100 |
29 |
7 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
143 |
165 |
490 |
|
3"×4" |
K |
210 |
168 |
127 |
32 |
10 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
162 |
155 |
540 |
|
4"×6" |
N |
273 |
215.9 |
157 |
38 |
10 |
8-25 |
150 |
279 |
241.5 |
216 |
26 |
1.6 |
8-22 |
210 |
200 |
620 |
|
6"×8" |
R |
356 |
292 |
216 |
46 |
10 |
12-29 |
200 |
343 |
298.5 |
270 |
29 |
1.6 |
8-22 |
241 |
240 |
790 |
|
A48SC900,A48SC9001,A48SC900V |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
do |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN' |
D' |
D1 |
D2' |
b' |
t' |
Z-φd' |
L |
L1 |
H |
|
|
11/2"×2" |
F |
178 |
123.8 |
73 |
32 |
10 |
4-29 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
165 |
124 |
440 |
|
2"×3" |
H |
216 |
165.1 |
92 |
38 |
10 |
8-26 |
80 |
190 |
152.5 |
127 |
20 |
1.6 |
4-19 |
162 |
154 |
480 |
|
3"×4" |
J |
241 |
190.5 |
127 |
38 |
10 |
8-25 |
100 |
229 |
191 |
92 |
22 |
1.6 |
8-19 |
181 |
184 |
550 |
|
4"×6" |
K |
292 |
234.9 |
157 |
44 |
12 |
8-32 |
150 |
279 |
241.5 |
127 |
31 |
1.6 |
8-22 |
222 |
197 |
630 |
|
A48SC1500,A48SC15001,A48SC1500V |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
do |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN' |
D' |
D1 |
D2' |
b' |
t' |
Z-φd' |
L |
L1 |
H |
|
|
1"×11/2" |
D |
149 |
101.6 |
51 |
28 |
15 |
4-25 |
40 |
156 |
114.5 |
73 |
20 |
1.6 |
4-22 |
125 |
125 |
420 |
|
11/2×21/2" |
E |
178 |
123.8 |
73 |
32 |
14 |
4-28 |
40 |
156 |
114.5 |
73 |
20 |
1.6 |
4-22 |
150 |
194 |
450 |
|
11/2"×2" |
E |
178 |
123.8 |
73 |
32 |
15 |
4-18 |
50 |
165 |
127 |
92 |
22 |
1.6 |
8-19 |
150 |
194 |
450 |
|
11/2×3" |
E |
178 |
123.8 |
73 |
41 |
17 |
4-29 |
80 |
210 |
268.5 |
127 |
31 |
1.6 |
8-22 |
155 |
254 |
450 |
|
A48SC2500,A48SC2500V |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
do |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN' |
D' |
D1 |
D2' |
b' |
t' |
Z-φd' |
L |
L1 |
H |
|
|
11/2×21/" |
F |
205 |
146.0 |
73 |
45 |
17 |
4-32 |
65 |
190 |
149.0 |
105 |
27 |
1.6 |
8-22 |
165 |
140 |
670 |
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