SRB Combination Reducing - Relief Regulators serve a dual function. They relieve upstream pressure while at the same time controlling downstream pressure. The controlled pressure downstream is equal to the upstream pressure minus the spring setting. Springs are color-coded in cataloged pressure ranges. Inlet pressures to 25 psig operating; maximum surge to 50 psig without damage.
FEATURES
Available in sizes 3/4'' through 3'' NPT.
Drip tight shut-off below start to open point
Balanced valve design
Synthetic reinforced diaphragms - for air, all fuel & inert gases
Inlet pressures to 25 psig operating, maximum surge to 50 psig without damage
Rugged proven design
Standard SRB series operating temperatures to 150°F
CAPACITY TABLE
Relief Regulator Catalog Number
Pipe Size NPT
Capacities in SCFH of Various Specific Gravity Gases @ 14" W.C. Pressure Drop
0.4
0.6
1.0
1.5
2.0
SRB 6
3/4"
1,230
1,000
780
630
550
SRB 8
1"
2,400
2,000
1,500
1,200
1,100
SRB 12
1-1/2"
4,900
4,000
3,100
2,500
2,200
SRB 20
2-1/2"
12,300
10,000
7,800
6,300
5,500
SRB 24
3"
21,000
17,000
13,000
11,000
9,200
SPRING RANGES
Spring Number
Spring Color
Spring Adjustment Range Start to Stroke Setting
Minimum
Maximum
4
Red
1" W.C.
8" W.C.
16
Orange
7" W.C.
30" W.C.
48
White
12 osi
48 osi
Spring #48 not available on #SRB-20 and SRB-24