12
Model 121 Regulators – Variations – Brochure
Vacuum Breaker
Vacuum Breakers
are vacuum limiting devices. In their general function, they can be
compared to relief valves or back pressure regulators.
The breaker outlet and control line are piped to the vacuum. The breaker inlet connects
to a lesser vacuum, to atmosphere, or to a positive pressure. The maximums for the
positive pressure are 60 psi for ¾" through 2½" sizes, 40 psi for 3", and 15 psi for 4".
The vacuum breaker is normally closed and excess vacuum creates a valve opening
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the excess.
All of the pipe sizes listed on Page 8 are available ¾" through 4". Note on the cutaway
drawing that the main spring is reversed to provide the upward closing force on
the valve. Except for certain parts used in the spring assembly, everything else is
interchangeable with standard 121 regulators.
GCD1328-060
Vacuum and Springs
Size
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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"
30" to 56"
red-black
blue-black
green-black
blue (2" O.D.)
green (2" O.D.)
orange (2" O.D.)
143-82-021-00
143-82-021-01
143-82-021-02
143-16-021-04
143-16-021-05
143-16-021-06
1½", 2" and 2½"
Model 121-12
3" to 6½"
5" to 8½"
8" to 14"
12" to 28"
28" to 56"
red (2" O.D.)
blue (2" O.D.)
green (2" O.D.)
orange (2" O.D.)
black
143-16-021-03
143-16-021-04
143-16-021-05
143-16-021-06
143-16-021-07
3" and 4"
Model 121-16
3" to 5½"
4" to 7½"
7" to 14"
red (3" O.D.)
blue (3" O.D.)
green (3" O.D.)
121-62-021-50
121-62-021-51
121-62-021-52
3" and 4"
Model 121-12
12" to 28"
28" to 56"
orange (2" O.D.)
black
143-16-021-06
143-16-021-07
Periodic Inspection:
Regulators are pressure control devices with numerous moving
parts subject to wear that is dependent upon particular operation
conditions. To ensure continuous satisfactory operation,
adhere to periodic inspection schedule with the frequency of
inspections determined by the security of service and applicable
laws and regulations.
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instructions and warranty obligation.
GCD1328-060
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