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Vacuum Relief Valves
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Vacuum Relief Valves allow large volumes of air
to enter a system when a vacuum occurs but prevents air from being exhausted upon
pump-startup. This trapped air column could be exhausted by the addition of a small
orifice air release valve. This controlled release allows air to act as a cushion to help
prevent potential surge.
- Cracks open to admit air at .25 PSIG differential
pressure
- Resilient drop tight seat
- ANSI Class 125 and Class 250 flanged connection
| Part No. |
Item |
Materials |
| *1 |
Body |
Cast Iron |
| **2 |
Resilient Seat |
Bronze/BUNA-N |
| **3 |
Disc |
Bronze |
| 4 |
Spring |
Stainless Steel |
| **5 |
Bushing |
Bronze |
| 6 |
Cap Screw |
Stainless Steel |
| 9 |
Dome Assembly |
Steel |
| 11 |
Bolt |
Steel |
| 12 |
Nut |
Steel |
| 24 |
Gasket |
Armstrong |
Optional Materials-
* Ductile Iron
** Stainless Steel
Vacuum Relief Valves shall be installed at
high points in the line or as directed by the engineer to relieve a vacuum due to column
seperation or draining the line.
The valve disc shal be center guided and held normally closed by a stainless steel spring.
The seat surfaces shall be bronze and BUNA-N. The minimum flow area perpendicular to the
direction of flow thru the valve shall be equal to the pipe area. The valve shall
satisfactorily withstand a hydrostatic pressure of 300 PSIG. The outlet shall be protected
by a hood and screen.
1"-2": The valve(s) materials of construction shall be bronze body, stainless
steel spring and acetal polymer poppet with a BUNA-N seat.
| Model |
Inlet Size |
Inlet Class |
O.D. |
Height |
Height w/ Air Release Valve |
Weight |
Weight w/ Air Release Valve |
| VR31 |
3" |
125 |
7-1/2" |
9-1/2" |
12-1/4" |
36 lbs. |
45 lbs. |
| VR32 |
3" |
250 |
8-1/4" |
9-1/2" |
12-1/4" |
52 lbs. |
61 lbs. |
| VR41 |
4" |
125 |
9" |
11-1/4" |
13-1/4" |
56 lbs. |
65 lbs. |
| VR42 |
4" |
250 |
10" |
11-1/2" |
13-1/4" |
85 lbs. |
94 lbs. |
| VR51 |
5" |
125 |
10" |
13-1/4" |
18-1/2" |
70 lbs. |
115 lbs. |
| VR52 |
5" |
250 |
11" |
13-3/4" |
18-1/2" |
115 lbs. |
140 lbs. |
| VR61 |
6" |
125 |
11" |
14-1/2" |
20" |
94 lbs. |
119 lbs. |
| VR62 |
6" |
250 |
12-1/2" |
15" |
20" |
151 lbs. |
176 lbs. |
| VR81 |
8" |
125 |
13-1/2" |
18-1/4" |
21-1/4" |
158 lbs. |
183 lbs. |
| VR82 |
8" |
250 |
15" |
18-3/4" |
21-1/4" |
243 lbs. |
268 lbs. |
| VR101 |
10" |
125 |
16" |
22-1/4" |
24-1/4" |
269 lbs. |
294 lbs. |
| VR102 |
10" |
250 |
17-1/2" |
22-3/4" |
24-1/4" |
385 lbs. |
410 lbs. |
| VR121 |
12" |
125 |
19" |
22-1/4" |
24" |
387 lbs. |
439 lbs. |
| VR122 |
12" |
250 |
20-1/2" |
23" |
24" |
562 lbs. |
614 lbs. |
| VR141 |
14" |
125 |
21" |
24-1/4" |
24-3/4" |
453 lbs. |
492 lbs. |
| VR142 |
14" |
250 |
23" |
25" |
24-3/4" |
700 lbs. |
752 lbs. |
| VR161 |
16" |
125 |
23-1/2" |
26-3/4" |
25-3/4" |
580 lbs. |
632 lbs. |
| VR162 |
16" |
250 |
25-1/2" |
27-3/4" |
25-3/4" |
960 lbs. |
1012 lbs. |
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