Pressures and Springs
Size
5HOLHIRU%DFN
Pressure Range
Spring Color
Part Number
Maximum Diaphragm
Case Pressure
¾" thru 2½"
Model 121-8
3" to 5½" w.c.
5" to 7½" w.c.
6" to 13" w.c.
10" to 15" w.c.
12" to 25" w.c.
18" w.c. to 2 psi
1 psi to 4 psi
red-black
blue-black
green-black
blue (2" O.D)
green (2" O.D)
orange (2" O.D.)
black
143-82-021-00
143-82-021-01
143-82-021-02
143-16-021-04
143-16-021-05
143-16-021-06
143-16-021-07
10 psi
¾" thru 2½"
Model 121-8
3 psi to 6 psi
6 psi to 10 psi
cadmium*
cadmium (outer)*
white (inner)
143-16-021-08
143-16-021-08
143-16-021-13
20 psi
1½", 2" and 2½"
Model 121-12
3" to 5½" w.c.
5" to 7" w.c.
6" to 12" w.c.
12" to 25" w.c.
red (2" O.D.)
blue (2" O.D.)
green (2" O.D.)
orange (2" O.D.)
143-16-021-03
143-16-021-04
143-16-021-05
143-16-021-06
10 psi
1½" thru 4"
Model 121-12
20" w.c. to 1¾ psi
1½ to 2¾ psi
black
cadmium
143-16-021-07
143-16-021-08
10 psi
3" and 4"
Model 121-16
3" to 4½" w.c.
3" to 6" w.c.
5" to 11" w.c.
10" to 24" w.c.
14" w.c. to 1¼ psi
red (3" O.D.)
blue (3" O.D.)
green (3" O.D.)
orange (3" O.D.)
yellow
121-62-021-50
121-62-021-51
121-62-021-52
121-62-021-53
121-62-021-56
5 psi
* Require High Pressure Spring Adjustment (121-8HP).
11
Model 121 Regulators – Variations – Brochure
Back Pressure Regulator
Back Pressure Regulators
are also used as Relief Valves. When so used, the
121 is a throttling or modulating type of relief valve, not a “pop” type. During an
emergency it only relieves excess pressure. In addition, it closes tight when the
emergency ends.
Back Pressure Regulators maintain constant upstream pressure by allowing
excess gas to exit to a lower pressure downstream.
All of the pipe sizes listed on Page 8 are available: ¾" through 4". Note on the
cutaway drawing that the valve opens upwards (in standard 121 regulators it
RSHQVGRZQZDUGV:LWKWKHH[FHSWLRQRIFHUWDLQVWHPDQGRUL¿FHSDUWVLQWKHYDOYH
assembly, everything else is interchangeable with standard 121 regualtors.
GCD1328-050
{
Vacuum Regulator
Vacuum Regulators
DUHXVHGWRPDLQWDLQDFHUWDLQQHJDWLYHSUHVVXUHYDFXXP
in enclosed spaces such as tanks, vessels, chambers, piping systems, etc. In
general, these are piped to the regulator inlet and control line connections and the
regulator outlet piped to the inlet of a vacuum pump or other vacuum source.
Available pipe sizes are ¾" thru 2½", as listed on Page 8. Note on the cutaway
drawing that the spring assembly is arranged for an upward force on the valve.
Also, the valve itself is normally open and moves downward to close rather than
upwards as in the standard 121. With the exception of certain parts involved in the
foregoing, everything else is interchangeable with standard 121 regulators.
GCD1328-055
Vacuum and Springs
Size
9DFXXP5DQJH
ZFYDFXXPZF
Spring Color
Spring
Part Number
¾", 1" and 1¼"
Model 121-8
3" to 6½"
5" to 8½"
8" to 14"
12" to 20"
18" to 30"
red-black
blue-black
green-black
blue
green
143-82-021-00
143-82-021-01
143-82-021-02
143-16-021-04
143-16-021-05
1½", 2" and 2½"
Model 121-12
3½" to 6½"
5" to 8½"
8" to 14"
red
blue
green
143-16-021-03
143-16-021-04
143-16-021-05
GCD1328-050
GCD1328-055
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