Groth 3000 Series - Manual (Page 8)

5
OPERATION
PRESSURE SETTING
The regulator may be set at the factory or on the tank
or vessel when initially introducing blanketing gas.
A pressure gauge (or manometer) is required to show
the tank pressure.
Set pressure is adjusted by removing the valve cap
[1] and rotating the adjusting screw [2]. Back off the
jam nut [3] and turn the screw clockwise (tighten) to
increase set pressure. The Model 3000 Regulator
covers a range of set pressures from 2" WC to 2.0
PSI, using (7) different springs. The model 3010 is required for set pressures from
1/2" WC to 2" WC, and model 3020 from 2.0 PSI to
10.0 PSI. In some cases, different actuator
components are also required, either to reduce the
weight for low settings or to withstand the forces due
to higher pressure. (See. Tables 3, 4 and 5).
The set pressure range with the original spring is
stamped on the valve nameplate. The regulator will
not function properly if the setting is not within this
range. If higher or lower settings are required, the
necessary components can be obtained from Groth
Corporation. They must be installed according to
instruction in the maintenance section of this manual.
Tables 3, 4 and 5 show standard set pressure ranges.
TABLE 3
SPRING TABLE
MODEL 3000
TANK BLANKETING REGULATOR
MEDIUM PRESSURE RANGE
SET PRESSURE RANGE: 2" WC - 2.0 PSIG
Spring
Range
Min.
Setting
Max.
Setting
Spring
P/N
Support
Plate
Back-up
Plate
Tank
MAWP
1
2.0"
WC 3.4"
WC 84209001
(Yellow) 83602015 83601005
4
PSI
2
3.4"
WC 6.3"
WC 84209002
(Green) 83602015 83601005
4
PSI
3
6.3"
WC 10.9"
WC
84209003
(Pink)
83602015
83601005
4
PSI
4
11.0"
WC
18.5"
WC
84209004
(Blue)
83602025
83601025
25
PSI
5
18.6"
WC
27.7"
WC
84209005
(White)
83602025 83601025
25
PSI
6
1.00
PSI
1.37 PSI 84209006
(Gray)
83602025 83601025
25
PSI
7
1.38
PSI
2.0
PSI
84209007
(Black)
83602025 83601035
25
PSI
TABLE 4
SPRING TABLE
MODEL 3010
TANK BLANKETING REGULATOR
LOW PRESSURE RANGE
SET PRESSURE RANGE: 0.5" WC - 2.0" WC
Spring
Range
Min.
Settin
g
Max.
Setting
Spring
P/N
Support
Plate
Back-up
Plate
Tank
MAWP
1 0.5"
WC 0.6"
WC
84209008
(Red)
83602035 83601005
10"
WC
2 0.7"
WC 1.0"
WC
84209001
(Yellow)
83602035 83601005
10"
WC
3 1.1"
WC 2.0"
WC
84209002
(Green)
83602005 83601015
10"
WC
TABLE 5
SPRING TABLE
MODEL 3020
TANK BLANKETING REGULATOR
HIGH PRESSURE RANGE
SET PRESSURE RANGE: 1.0 - 10.0 PSIG
Spring
Range
Min.
Setting
Max.
Setting
Spring
P/N
Support
Plate
Back-up
Plate
Tank
MAWP
1
1.0
PSI
1.80
PSI
84209002
(Green)
84829005 N/A
150
PSI
2
1.81
PSI
3.07
PSI
84209003
(Pink)
84829005 N/A
150
PSI
3
3.08
PSI
5.21
PSI
84209004
(Blue)
84829005 N/A
150
PSI
4
5.22
PSI
10.0 PSI
84209005
(White)
84829005 N/A
150
PSI
WARNING
The recommended set pressure range of the regulator
spring is stamped on the nameplate. Never adjust a
spring for a set pressure above its upper design limit
as specified in Tables 3, 4 and 5. Exceeding the spring
rang may compress the spring to its solid height. If
this happens the regulator may not close and the tank
could be over-pressured if the relief valve capacity is
less than supply gas flow rate.