411G/421 Series Inverted Bucket Steam Traps

411G/421 Series Inverted Bucket Steam Traps
Forged Carbon Steel for Vertical and Horizontal Installation
For Pressures to 1,000 psig (69 bar)...Capacities to 1,300 lb/hr (590 kg/hr)
Steam Trapping and
Steam Tracing Equipment
A
K
BB
A
BB
B
B
G
G
Model 411G Trap
Model 421 Trap
Description
Connections
A unique leverage system multiplies the force provided by the bucket to open
the valve against system pressure. The mechanism is free-floating and has
no fixed pivots to create wear or friction.
See page 185 for dimensional information for flanged and socketweld
connections.
Armstrong Model 411G vertical installation and Model 421 horizontal installation
offer smaller capacities at higher pressures.
Because the mechanism is located at the top of the trap, no dirt can collect
on the orifice. Small particles of dirt are held in suspension until discharged
by the full differential purging action when the bucket sinks, pulling the valve
off the seat.
The discharge orifice is surrounded by a water seal, preventing live steam
loss. Automatic air venting is provided by a small vent hole in the bucket.
Screwed NPT and BSPT
Socketweld
Flanged
Materials
Body: 411G cap:
421 cap:
Internals: Valve and seat: Inverted bucket traps drain continuously to prevent condensate backup.
They are also resistant to water hammer.
Options
Model 421 adds the convenience and savings of in-line repairability and is
designed to meet today’s energy-management requirements efficiently and
economically over a long, trouble-free service life.
Specifications
Stainless steel internal check valve (411G only)
411G Bottom Inlet, Top Outlet Traps; 421 Side Inlet, Side Outlet Traps
Add suffix “CV” to trap number for internal check valve.
Model No. Screwed or SW
Model No. Flanged
411G
411G-FW
ASTM A105
ASTM A105
ASTM A216 WCB
All stainless steel—304
Titanium
421
421-FW
Inverted bucket steam trap, type ... in forged carbon steel, with continuous
air venting at steam temperature, free-floating stainless steel mechanism,
with the discharge orifice at the top of the trap.
How to Order
1/2, 3/4
15, 20
1/2, 3/4
15, 20
“A” (Diameter)
6-5/16
160
8
203
Specify:
• Model number
• Size and type of pipe connection. When flanges are required,
specify type of flange in detail
• Maximum working pressure that will be encountered or orifice size
• Any options required
“B” (Height, Screwed or SW)
8-13/16
224
10-9/64
258
For a fully detailed certified drawing, refer to CD #1105.
“BB”
1315/16*
354*
11-3/4*
298*
“G” (Body OD)
4-1/16
103
3-7/8
98
19.0
–
Pipe Connections
“K” (CL Outlet to CL Inlet)
Number of Bolts
in
mm
in
mm
3/4
–
8
8
Weight Scr. or SW lb (kg)
25 (11.3)
27-1/2 (12.6)
Weight, Flanged lb (kg)
35 (15.9)
36 (16.3)
*“BB” dimensions shown are for 3/4" conn., Class 900 flanged. Consult
factory for dimensions of models with other connection sizes and/or
flanges.
88
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim
armstronginternational.com
411G/421 Series Inverted Bucket Steam Traps
Forged Carbon Steel for Vertical and Horizontal Installation
For Pressures to 1,000 psig (69 bar)...Capacities to 1,300 lb/hr (590 kg/hr)
Steam Trapping and
Steam Tracing Equipment
Model 411G and 421 Capacity
NOTE: #38 orifice in Model 421 is limited to 560 psi (39 bar).
Pressure-Temperature Rating for Forged Steel Traps
Model
No.
Max. Oper.
Pressure,
Sat. Steam
411G/421
1,000 69
psig
bar
Maximum Allowable Pressure (Vessel Design) of
Pressure-Containing Parts at Indicated Temperature
°F
°C
-20/+650 -28/+343
psig
bar
1,000
69
°F
°C
°F
°C
700
371 750
399
°F
°C
psig
bar psig
bar psig bar
800 427
1,000 69 950 65.5 840 58
NOTE: Maximum operating pressure to be marked on nameplate will be determined by
actual orifice used. Maximum allowable pressures shown in boldface will be marked on
nameplate, unless otherwise requested. Traps with flanges may have different pressuretemperature ratings.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim
armstronginternational.com
89
Next

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project