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BR-G-REG-13-28-0312-01-A*

Model 121 Regulators

Brochure

*This document replaces R-1328-R9

Introduction

For Commercial, Industrial Combustion

and Distribution Applications

The Model 121

is a new dimension in spring regulator capability,

offering spring regulator

dependability, simplicity

and

economy

New technology plus contemporary design provides greater
capacity, higher inlet pressure, more accurate performance
and faster response, with resulting economy

— in most cases

a smaller regulator will do the job.

Use the 121 for commercial and industrial applications: burners,

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its fast response.

Use it also as a large capacity supply regulator on commercial
or industrial service lines, or as a small district regulator.

Outlet Pressure Ranges and Springs

Size

Outlet

Pressure Range

Spring Color

Spring

Part Number

Maximum

Inlet Pressure

Nominal

Diaphragm Size

¾", 1", and 1¼" **

Model 121-8

1½" to 3½" w.c.

blue-black

black-red

143-82-021-01 (main spring)

121-10-021-50 (counterspring)

60 psi

1½" to 12" w.c.

green-black

black-red

143-82-021-02 (main spring)

121-10-021-50 (counterspring)

3½" to 6½" w.c.

5" to 8½" w.c.

6" to 14" w.c.

12" to 28" w.c.

1 psi to 2 psi

2 psi to 4¼ psi

red-black

blue-black

green-black

green (2" O.D.)

orange (2" O.D.)

black

143-82-021-00

143-82-021-01

143-82-021-02

143-16-021-05

143-16-021-06

143-16-021-07

¾", 1" and 1¼" **

Model 121-8HP

3 psi to 6 ½ psi

cadmium*

143-16-021-08

60 psi

6 psi to 10 psi

cadmium*

white

143-16-021-08 (outer)

143-16-021-13 (inner)

1½", 2" and 2½"

Model 121-12

1½" to 3½" w.c.

red

—

143-16-021-03(main spring)

120-10-021-10 (counterspring)

60 psi

12"

1½" to 12" w.c.

maroon

—

121-42-021-00 (main spring)

120-10-021-10 counter spring)

3½" to 6½" w.c.

5" to 8½" w.c.

6" to 14" w.c.

12" to 28" w.c.

1 psi to 2 psi

1½ psi to 3 psi

red (2" O.D.)

blue (2" O.D.)

green (2" O.D.)

orange (2" O.D.)

black

cadmium

143-16-021-03

143-16-021-04

143-16-021-05

143-16-021-06

143-16-021-07

143-16-021-08

1½", 2" and 2½"

Model 121-8

1 psi to 2 psi

2 psi to 4¼ psi

orange (2" O.D.)

black

143-16-021-06

143-16-021-07

60 psi

1½", 2" and 2½"

Model 121-8HP

3 psi to 6½ psi

cadmium*

143-16-021-08

60 psi

6 psi to 10 psi

cadmium*

white

143-16-021-08 (outer)

143-16-021-13 (inner)

3" and 4"

Model 121-16

3½" to 6½" w.c.

5" to 8½" w.c.

6" to 14" w.c.

14" to 28" w.c.

½ psi to 1¼ psi

red (3" O.D.)

blue (3" O.D.)

green (3" O.D.)

oramge (3" O.D.)

yellow

121-62-021-50

121-62-021-51

121-62-021-52

121-62-021-53

121-62-021-56

40 and 15†

16"

3" and 4"

Model 121-12

1 psi to 2 psi

1½ psi to 3 psi

black

cadmium

143-16-021-07

143-16-021-08

40 and 15†

12"

* Require High Pressure Spring Adjustment.

† 3" 121 is 40 psi., 4" 121 is 15 psi.

** ¾" x ¾" not available.

It’s excellent for primary control or monitoring — use it for either
or both.

The 121 is actually a whole new family of regulators – standard
regulator, zero governor or atmospheric regulator, differential
regulator, back pressure regulator, or relief valve, vacuum
regulator and vacuum breaker.

Compatible with natural gas, propane, LPG, air nitrogen, etc.
Special material available for certain corrosive gases. For
installation, servicing and parts, see Bulletin IN-G-REG-1328.

And, for a complete 121 regulator, ready to go back to work
for you – contact your Sensus Representative or Authorized
Industrial Distributor.