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Pressure Air Release Valves
Stainless Steel Trim or Bronze and Stainless Steel Float
Systems under pressure can be vented of
accumulating air thru the use of pressure air valves. These should be mounted on the
system at all high points and downstream from these points where velocity of the liquid
carries the air or gas slightly beyond the crest. On lines with little gradient, valves
should be placed every half mile or so, at the discretion of the engineer.
The types offered by Crispin are Type "N" for normal use in water below 150 F
(65 C) and Type "P" for use with all types of fluid.
Orifice Size for
Various Pressure Ranges
| Valve Size |
MAXIMUM
OPERATING PRESSURE IN PSI |
| Max. 50 |
Max. 100 |
Max. 150 |
Max. 200 |
Max. 250 |
Max. 300 |
| 1" |
5/16" |
5/16" |
1/4" |
3/16" |
5/32" |
1/8" |
| 2" |
3/8" |
3/8" |
5/16" |
1/4" |
3/16" |
5/32" |
| 2.5" |
5/8" |
1/2" |
7/16" |
3/8" |
9/32" |
1/4" |
| 3" |
3/4" |
5/8" |
1/2" |
7/16" |
5/16" |
9/32" |
| 4" |
1" |
3/4" |
5/8" |
1/2" |
7/16" |
3/8" |
When a valve is used in a system where it is
designed to hold a vacuum, such as in a pump prime, an optional vacuum check unit is
offered which will prevent air from re-entering the system.
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