Features
•
Sizes 1/2" NPT up to 2" Flanged
• Auto Ball Checks
• For Glass Tube or Shielded Gauges
Ratings
•
Pressure Ratings
are subject to the
limitations of the gauge glass (Page 42)
• Temperature Ratings are subject to the
limitations of the packing (Page 45).
Materials
•
Body: Carbon Steel
• Glass Packing on 454/456: Graphite
• Glass Packing on 442: Viton®*
O-Ring
• Glass Packing on 412: Neoprene
• Stem Packing: Graphite Composite
• Stem Packing for 442: Teflon®*
A
Special Note About Corrosion
• Excessive corrosion may
result in leakage, glass
breakage, and premature valve failure.
• Be sure all wetted components of the g auge are
constructed with materials compatible with the
service medium. John C. Ernst Co. does not
make chemical compatibility recommendations.
• See the "Compass Corrosion Guide"
or
equivalent for material compatibility
Model
454 has an integral bonnet and stem seat.
Model 456 has a union bonnet for stem seat replacement.
Model 442 can have a drain valve as an option.
| Model |
Size
NPT |
Glass
OD |
Glass
Length from Centers |
Rod
Length from Centers |
| 412-04 |
1/2" |
5/8" |
-
2" |
-
1" |
| 412-05 |
3/4" |
3/4" |
-
2" |
-
1" |
| 442-04 |
1/2" |
5/8" |
-
2" |
-
1/2" |
| 442-05 |
3/4" |
3/4" |
-
2" |
-
1/2" |
| 454-04 |
1/2" |
5/8" |
-
1-3/4" |
-
2-1/4" |
| 454-05 |
3/4" |
3/4" |
-
1-3/4" |
-
2-1/4" |
| 454-06 |
1" |
3/4" |
-
1-3/4" |
-
2-1/4" |
| 456-04 |
1/2" |
5/8" |
-
1-3/4" |
-
2-1/4" |
| 456-05 |
3/4" |
3/4" |
-
1-3/4" |
-
2-1/4" |
| 456-06 |
1" |
3/4" |
-
1-3/4" |
-
2-1/4" |
| Model |
Maximum
Liquid Pressure @ Temp
PSIG
/ °F |
Steam
Service
PSIG |
Auto
Ball Checks |
| 412 |
500/100°F
to 500/425°F |
500 |
Yes |
| 442 |
500/100°F
to 500/425°F |
N/A |
Yes |
| 454 |
600/100°F
to 345/400°F |
345 |
Yes |
| 456 |
600/100°F
to 345/400°F |
345 |
Yes |
For
Glass see Page 42.
For Shielded Gauges see Page
34. |
