Product Overview | Relief Valves
PITOT TUBE
7377-1
7377-4
7377-03
Fig. 1. 7377 Relief Valves
The 7377 is a throttling relief valve to vent overpressure used downstream of pressure regulators. Relief valves are available in ¼", 1", and 2" sizes with spring ranges from 1 psi to 50 psi. Refer to Table 1. The 1" and 2" sizes feature a Pitot tube booster (Fig. 1) for achieving the highest possible relief capacity with a minimum build-up of system pressure. When selecting any relief valve
for installation downstream of a regulator, the capacity of the relief valve should be compared with the wide open capacity of the regulator. Refer to Fig. 2 curves to obtain flow capacities at respective spring settings.
Table 1. Spring Ranges and Maximum Allowable Inlet Pressure
spring relief setting
capacity at max. inlet pressure
Relief Valve designation 7377-03-2 7377-03-5 7377-03-10 7377-1-2 7377-1-5 7377-1-10 7377-1-25
body size
spring range
max. allowable inlet pressure
weight
(scfh) †
(lb)
¼ " ¼ " ¼ "
2.5 psig
0.72-3 psig
10 psig
950
1 1 1
5
3-13 3-13 1-4.5 4-15 4-15 15-50
45 45
1 750 1 750
10
1" 1" 1" 1"
2.5
100 100 100 100
87 000 87 000 87 000 87 000
4 4 4 4
5
10 25
7377-4-10
2"
10
4-10
25
81 000
15
† Values are obtained with no outlet (vent) piping and are for 0.6 specific gravity gas at 60°F vented to atmosphere (14.7 psia).
Bulletin 7377 Page 2
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