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
Table 1. Spring Ranges and Maximum Allowable Inlet Pressure
spring
capacity at max.
Relief Valve
relief
spring
max. allowable
inlet pressure
weight
designation
size
setting
range
inlet pressure
(scfh)
†
(lb)
7377-03-2
¼
"
2.5 psig
0.72-3 psig
10 psig
950
1
7377-03-5
¼
" 5
3-13
45
1
750 1
7377-03-10
¼
" 10
3-13
45
1
750 1
7377-1-2
1" 2.5 1-4.5
100
87
000 4
7377-1-5
1" 5
4-15
100
87
000 4
7377-1-10
1" 10 4-15
100
87
000 4
7377-1-25
1" 25 15-50
100
87
000 4
7377-4-10
2" 10
4-10
25
81
000 15
† Values are obtained with no outlet (vent) piping and are for 0.6 specifi c gravity gas at 60°F vented to atmosphere (14.7 psia
).
7377-1
7377-4
7377-03
Fig. 1. 7377 Relief Valves
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 fl ow capacities at
respective spring settings.
Bulletin 7377
Page 2
PITOT TUBE
Product Overview | Relief Valves
