Wenzhou Starry Valve Co., Ltd. is one of the most reliable manufacturers and suppliers of vacuum safety relief valve in China. We are committed to providing high quality customized valves with low price. If you're going to buy bulk durable vacuum safety relief valve, welcome to get quotation from our factory.
Features
Negative-pressure anti-vacuum protection
Automatically opens when system vacuum exceeds set value, admits atmosphere air into equipment for pressure equalization; effectively prevents tank implosion, pipeline collapse caused by excessive vacuum.
01
Spring-loaded fully mechanical structure
No external power or air supply required; vacuum opening setpoint adjustable, sensitive action, stable performance.
02
Reliable re-sealing performance
Automatically recloses after pressure returns to normal, maintains tight sealing under normal working conditions.
03
Multiple material options
Carbon steel, SS304, SS316L optional, suitable for corrosive working conditions; general working temperature ≤200℃.
04
Important note
Single-function vacuum-only protection, cannot relieve positive over-pressure. For dual positive-pressure & vacuum protection, select Pressure-Vacuum Relief Valve.
05
Typical Application Equipment
- Chemical reaction kettles and negative-pressure pressure vessels
- Atmospheric storage tanks, vacuum tanks
- Vacuum pipelines and condensation systems
- Heat exchangers and cooling equipment Petrochemical, pharmaceutical, food-beverage and environmental-protection process systems
Vacuum Safety Relief Valve is dedicated safety device for vacuum and negative-pressure systems. It opens to admit air and break excessive vacuum so as to protect tanks, vessels and pipelines from implosion and deformation. Vacuum Safety Relief Valve widely applied in chemical, petrochemical, pharmaceutical, food and environmental-protection industries.
A72W is applicable for negative-pressure systems with temperature below 200°C. When the negative pressure inside the container exceeds the allowable value, the valve will open automatically to admit air. When the negative pressure drops back to the allowable value, the valve will close automatically, so as to protect the equipment and system. It shall be installed on normally non-negative-pressure systems. When negative pressure is generated as the discharge valve of container and system fails to open, this valve will open automatically.
Materials For Main Parts
|
NO. |
Name of part |
Materials |
|
|
A72W-P |
A72W-R |
||
|
1 |
Body |
CF8 |
CF8M |
|
2 |
Seat |
304 |
316 |
|
3 |
Adjusting ring |
304 |
316 |
|
4 |
Bonnet |
CF8 |
CF8 |
|
5 |
Stem |
304 |
316 |
|
6 |
Spring |
50CrVA |
50CrVACoated Teflon |
|
Working tempe rature |
≤200℃ |
|
Suitable |
A72W-10P Nitric acid etc.medium |
|
medium |
A72W-10R Acetic acid etc.medium |
Vacuum Safety Relief Valve Dimensions (mm)
|
Nominal diameter |
Dimensions(mm) |
||||||
|
D |
D1 |
D2 |
Z-φd |
b |
f1 |
H |
|
|
15 |
95 |
65 |
45 |
4-14 |
14 |
2 |
110 |
|
20 |
105 |
75 |
55 |
4-14 |
16 |
2 |
130 |
|
25 |
115 |
85 |
65 |
4-14 |
16 |
2 |
150 |
|
32 |
140 |
100 |
78 |
4-18 |
18 |
2 |
180 |
|
40 |
150 |
110 |
85 |
4-18 |
18 |
3 |
200 |
|
50 |
165 |
125 |
100 |
4-18 |
20 |
3 |
221 |
|
80 |
200 |
160 |
135 |
4-18 |
22 |
3 |
245 |
|
100 |
220 |
180 |
155 |
8-18 |
22 |
3 |
253 |
|
125 |
250 |
210 |
185 |
8-18 |
24 |
3 |
280 |
|
150 |
285 |
240 |
210 |
8-23 |
24 |
3 |
329 |
|
200 |
340 |
295 |
265 |
8-23 |
26 |
3 |
377 |
|
250 |
395 |
350 |
320 |
12-23 |
28 |
3 |
440 |
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