Wenzhou Starry Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of psv oil and gas in China. We are committed to providing high quality customized valves with low price. If you're going to buy bulk durable psv oil and gas, welcome to get quotation from our factory.
| Size Range | DN20 ~ DN200 (3/4" ~ 8") |
| Pressure Class | Class150, 300, 600, 900, 1500 (ASME B16.5 pound-grade) |
| Temperature Range | -29℃ ~ 300℃ for WCB body;-60℃ ~200℃ for stainless steel trim |
| Connection Type | Flanged inlet & outlet comply with ASME B16.5 standard, angle-pattern installation |
| Body Material | A216-WCB, CF8, CF8M for corrosive medium service |
| Operation Type | Spring-loaded, Closed bonnet, Full-lift, packed external manual test lever, conventional type (non-bellows) |
| Lifting Height | ≥1/4 of nozzle diameter, standard full-lift relief capacity |
| Execution Standard | API 520, API 526, API 527, ASME Sec.VIII, GB/T12243-2021 |
| Structural Feature | Closed bonnet with packed-gland lever assembly; manual lever for on-site functional test; adjustable nozzle ring for blow-down tuning; Stellite hard-alloy overlay sealing face; outlet flange larger than inlet flange for high-capacity discharge. Closed bonnet prevents toxic & volatile medium leakage to atmosphere, suitable for closed vent piping connection. |
| Suitable Media | Steam, compressed air, oil, hydrocarbon, non-cryogenic volatile gas-liquid medium. Widely applied for pressure vessels, separators, storage tanks and process piping in petrochemical, refinery and general-industrial plant. |
Features
A44C adopts fully-closed bonnet with packing-gland sealing for lever stem. Compare with A48SC open-bonnet design, it prevents medium escaping through bonnet housing, allows connecting closed discharge piping for toxic, volatile, harmful media. External packed lever can perform manual lift test when system pressure reaches 75% of set-pressure, verify valve free-movement without dismantling insulation or removing bonnet parts.
Built-in back-blow disc assembly, full-lift opening ≥1/4 nozzle diameter. Adjustable nozzle ring precisely modulates blow-down value to satisfy different project requirement. Discharge capacity fully complies with API-520 calculation formula. Large-size outlet flange ensures rapid mass-flow relief upon over-pressure event.
Nozzle and disc seating surface hard-faced with Stellite cobalt-base alloy. Excellent anti-erosion and wear-resistant property under cyclic relief operation. Seat tightness meets API-527 leakage acceptance criteria, reduces seat-blow-by risk for hydrocarbon and oil-gas process service, extends maintenance interval.
Pure spring-driven conventional safety valve, no external power source. Set-pressure can be precisely adjusted on-site. Automatic opening for over-pressure relief; tight re-seating when pressure drops to blow-down range. Simple robust construction for heavy-duty continuous-process plants. Note: performance will be affected by variable superimposed back-pressure, for fluctuating back-pressure working condition, select bellows-type WA44C instead.
WCB carbon steel for general steam & hydrocarbon; CF8/CF8M stainless steel trim for corrosive fluid. NACE-MR0175 wetted components can be specially ordered for sour-H₂S environment. Flange dimensions strictly follow ASME B16.5 pound-grade for overseas EPC & petrochemical projects.
Typical Application Equipment
- Petrochemical pressure vessels, hydrocarbon storage tank and separator
- Refinery process pipeline, heat-exchanger and steam auxiliary equipment
- General-industry pressure equipment requiring closed bonnet and manual-test lever
- Working sites with volatile, harmful medium that forbid open bonnet leakage
- Overseas EPC projects requesting API-526 pound--grade safety accessories
Working Principle & Application Notes
PSV oil and gas with packed-gland manual lever and closed bonnet. Under normal working pressure, spring force presses disc tightly against nozzle seat. When system pressure rises to set-pressure, medium thrust overcomes spring load, valve pops fully open for large-capacity relief. When system pressure falls to reset blow-down value, spring pushes disc back to seating position and reseats tightly. As conventional non-bellows structure, variable back-pressure will shift set-pressure and re-seating performance; WA44C bellows-balanced version is recommended when back-pressure fluctuates significantly. Not qualified for sour-H₂S service without NACE-specified material upgrade.Psv oil and gas provide set-pressure, operating temperature, medium property and relief capacity for proper sizing before order.
Main Property and Specifiecation
|
Normal Pressure |
PN |
150 |
300 |
600 |
|
Body strangth |
Ps(MPa) |
3 |
7.5 |
15 |
|
Set pressure |
Pk(MPa) |
0.1-2 |
1.6-5 |
3.2-10 |
|
Seal pressure |
Pm(MPa) |
90%Pk |
||
|
Reseation pressure |
Ph(MPa) |
≥90%Pk |
||
|
Relieving pressure |
Pp(MPa) |
≤1.1Pk |
||
|
Llift |
H(mm) |
≥1/4d0 |
||
|
Appropriate temperature |
C |
≤300℃ |
||
|
P,R |
≤200℃ |
|||
|
Appropriate medium |
C |
Gas,Liquid |
||
|
P,R |
Nedymium |
|||
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 |
PSV Oil And Gas Main Dimension
|
A44C150,A44C150P,A44C150R |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
do |
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 |
260 |
|
3/4"×1" |
D |
98 |
70 |
43 |
14 |
5 |
4-15 |
25 |
108 |
79.5 |
51 |
15 |
1.6 |
4-15 |
96 |
92 |
260 |
|
1"×11/2" |
D |
108 |
79.5 |
51 |
15 |
5 |
4-15 |
40 |
127 |
98.5 |
73 |
18 |
1.6 |
4-15 |
115 |
105 |
280 |
|
1"×2" |
D |
108 |
79.5 |
51 |
15 |
5 |
4-15 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
115 |
105 |
280 |
|
11/2"×2" |
G |
127 |
98.5 |
73 |
18 |
5 |
4-15 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
121 |
124 |
310 |
|
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 |
310 |
|
11/2×3" |
G |
127 |
98.5 |
73 |
18 |
5 |
4-15 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
310 |
|
2"×21/2" |
H |
152 |
120.5 |
92 |
18 |
5 |
4-19 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
124 |
130 |
350 |
|
2"×3" |
J |
152 |
120.5 |
92 |
18 |
5 |
4-19 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
350 |
|
21/2"×4" |
J |
178 |
139.5 |
105 |
20 |
5 |
4-19 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
143 |
137 |
430 |
|
3"×4" |
L |
190 |
152.5 |
127 |
22 |
5 |
4-19 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
162 |
156 |
490 |
|
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 |
200 |
343 |
298.5 |
270 |
29 |
1.6 |
8-22 |
241 |
240 |
840 |
|
8"×10" |
R |
343 |
298.5 |
270 |
29 |
10 |
8-22 |
250 |
406 |
362 |
324 |
31 |
1.6 |
12-25 |
279 |
276 |
990 |
|
12"×14" |
T |
483 |
432 |
381 |
32 |
10 |
12-25 |
350 |
533 |
476 |
413 |
35 |
1.6 |
12-29 |
370 |
360 |
1040 |
|
A44C300,A44C300P,A44C300R |
|||||||||||||||||
|
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 |
260 |
|
3/4"×1" |
D |
117 |
82.5 |
43 |
16 |
5 |
4-19 |
25 |
108 |
79.5 |
51 |
15 |
1.6 |
4-15 |
96 |
92 |
260 |
|
1"×11/2" |
D |
124 |
89 |
51 |
18 |
5 |
4-19 |
40 |
127 |
98.5 |
73 |
18 |
1.6 |
4-15 |
115 |
105 |
280 |
|
1"×2" |
D |
124 |
89 |
51 |
18 |
5 |
4-19 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
115 |
105 |
290 |
|
11/2"×2" |
F |
156 |
114.5 |
73 |
20 |
5 |
4-22 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
121 |
124 |
310 |
|
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 |
310 |
|
11/2×3" |
F |
156 |
114.5 |
73 |
20 |
5 |
4-22 |
80 |
190 |
152.5 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
310 |
|
2"×21/2" |
H |
165 |
127 |
92 |
22 |
5 |
8-19 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
124 |
130 |
350 |
|
2"×3" |
H |
165 |
127 |
92 |
22 |
5 |
8-19 |
80 |
190 |
1525 |
127 |
22 |
1.6 |
4-19 |
124 |
130 |
350 |
|
21/2"×4" |
J |
190 |
149 |
105 |
24 |
5 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
143 |
137 |
430 |
|
3"×4" |
L |
210 |
168.5 |
127 |
28 |
5 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
162 |
156 |
490 |
|
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 |
840 |
|
8"×10" |
R |
381 |
330 |
270 |
42 |
10 |
12-25 |
250 |
406 |
362 |
324 |
31 |
1.6 |
12-25 |
279 |
276 |
990 |
|
12"×12" |
T |
445 |
387.5 |
324 |
46 |
10 |
16-28 |
350 |
533 |
476 |
413 |
35 |
1.6 |
12-28 |
350 |
330 |
104 |
|
A44C600,A44C600P,A44C600R |
|||||||||||||||||
|
Nominal |
Dimension(mm) |
||||||||||||||||
|
d0 |
D |
D1 |
D2 |
b |
t |
Z-φd |
DN' |
D' |
D1' |
D2' |
b' |
t' |
Z-φd |
L |
L1 |
H |
|
|
3/4"×1" |
D |
118 |
82.5 |
43 |
16 |
7 |
4-19 |
25 |
108 |
79.5 |
51 |
15 |
16 |
4-15 |
96 |
92 |
280 |
|
1"×2" |
D |
124 |
89 |
51 |
19 |
7 |
4-9 |
50 |
152 |
120.5 |
92 |
18 |
1.6 |
4-19 |
115 |
105 |
300 |
|
11/2"×2" |
F |
156 |
114.5 |
73 |
22 |
7 |
4-22 |
50 |
152 |
120.5 |
92 |
18 |
16 |
4-19 |
152 |
124 |
300 |
|
11/2×21/2" |
F |
156 |
114.5 |
73 |
22 |
7 |
4-22 |
65 |
178 |
1395 |
105 |
20 |
.6 |
4-19 |
152 |
124 |
330 |
|
11/2×3" |
F |
156 |
114.5 |
73 |
22 |
7 |
4-22 |
80 |
190 |
1525 |
127 |
22 |
1.6 |
4-19 |
152 |
124 |
330 |
|
2"×21/2" |
H |
165 |
127 |
92 |
26 |
7 |
8-19 |
65 |
178 |
139.5 |
105 |
20 |
1.6 |
4-19 |
162 |
154 |
330 |
|
2"×3" |
H |
165 |
127 |
92 |
26 |
7 |
8-19 |
80 |
190 |
1525 |
127 |
22 |
1.6 |
4-19 |
162 |
154 |
360 |
|
21/2"×4" |
K |
190 |
149 |
100 |
29 |
7 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
143 |
165 |
360 |
|
3"×4" |
K |
210 |
168 |
127 |
32 |
10 |
8-22 |
100 |
229 |
190.5 |
157 |
24 |
1.6 |
8-19 |
162 |
155 |
440 |
|
4"×6" |
N |
273 |
216 |
157 |
38 |
10 |
8-25 |
150 |
279 |
241.5 |
216 |
26 |
1.6 |
8-22 |
210 |
200 |
610 |
|
6"×8" |
P |
356 |
292 |
216 |
46 |
10 |
12-29 |
200 |
343 |
298.5 |
270 |
29 |
1.6 |
8-22 |
241 |
240 |
625 |
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