9
Model 121 Regulators Brochure
Materials of Construction
Body and Adapter ...................................................Cast Iron
Diaphragm Case
DQG'LDSKUDJP««««'LH&DVW$OXPLQXP$OOR\
Diaphragm Case
'LDSKUDJP
.............Permanent Mold Aluminum Alloy
Main and Seal Diaphragms ....................... Buna-N on Nylon
Piston for Seal Diaphragm
ôWKUXò0RGHO
.........Powdered Iron-Zinc Plated
Piston for Seal Diaphragm
DQG0RGHO
................................Aluminum Alloy
Stem, Stud, Pans and Plates for
8", 12" and 16" Diaphragms .......................Stainless Steel
Stem bushing ................................................Stainless Steel
2UL¿FH
¾
WKUXó0RGHO
................................... Brass
2UL¿FHòWKUX0RGHO
..............................Cast Iron
5HWDLQLQJ5LQJòWKUX0RGHO
............ Plated Steel
Valve .................Plated Steel with Molded Buna-N Soft Seat
Valve Holder ..................................................Stainless Steel
Retaining Ring and Wave Washer.................Stainless Steel
O-Rings and Tetraseals ............................................ Buna-N
Adjustment Spring Ferrule .......................... Zinc Die Casting
Bottom Spring Button .........................Powdered Iron-Plated
$GMXVWPHQW6FUHZ'LDSKUDJPDQG
+3$GMXVWPHQW6SULQJ)HUUXOH
..................... Plated Steel
$GMXVWPHQW)HUUXOH6FUHZ'LDSKUDJP
and H.P. Adjustment Spring Ferrule ....................Cast Iron
6HDO&DSDQG'LDSKUDJP
.............. Zinc Die Casting
6HDO&DS'LDSKUDJP
............ Die Cast Aluminum Alloy
Body Taps
Inlet and outlet taps are available on either side of the body. Tap
size is ¼" NPT. Refer to “dimensions” on page 13. Desired taps
PXVWEHVSHFL¿HGZKHQRUGHULQJ
Metrication
Use the following for Metric Conversions:
std. meters
3
/hr. x 35.31 = std. ft.
3
/hr. (SCFH)
std. ft.
3
/hr. (SCFH) x 0.0283 = std. meters
3
/hr.
kilograms/centimeter²(kg/cm²) x 14.22 = psig
psig x 0.0703 = kilograms/centimeters²(kg/cm²)
kilopascals (kPa) x 0.145 = psig
psig x 6.90 = kilopascals (kPa)
bars x 14.50 = psig
psig x 0.69 = bars
millimeters water (mm H
2
O) x .0394 = in. w.c.
in. w.c. x 25.4 = millimeters water (mm H
2
O)
millimeters mercury (mm Hg) x 0.535 = in w.c.
in. w.c. x 1.868 = millimeters mercury (mm Hg)
How to order
Specify:
1.
Model Number.
2.
3LSHVL]HRQDQGVSHFLI\ZKHWKHUVFUHZHGRUÀDQJHG
3.
Inlet pressure.
4.
Outlet Pressure.
5.
Capacity required — SCFH.
6.
.LQGRIJDVQDWXUDOJDVSURSDQHDLUHWF
Buried Service
These regulators are designed for above ground or vault
installations and are not recommended for direct earth burial.
Temperature limits
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WR)
CAUTION
It is the user’s responsibility to ensure all regulator vents and/
or vent lines exhaust to a non-hazardous location away from
ANY POTeNTIAl sources of ignition. Refer to Sensus Bulletin
RM-1328 for more detailed information.
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