Watts WFT User Manual
For Steam Main Drips and Process Applications
ES-WFT
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Series WFT
Float & Thermostatic Steam Traps
Sizes: 3⁄4" – 2" (20 – 50mm)
For operating pressures up to 125psi (8.6 bar)
Series WFT Float & Thermostatic Steam Traps are designed to
provide continuous air venting and separate condensate draining with maximum efficiency and service. The “H” pattern body
on all
3
⁄4", 1" (15, 30, 75, 125psi) and 11⁄4" (15, 30psi) has been
designed to offer maximum installation flexibility. Four possible
hookup combinations, combined with similar piping dimensions
to other major manufacturers, make this the “universal” replacement trap. For larger sized traps, 1
1
⁄2", 2" (15, 30, 75, 125psi)
and 1
1
⁄4" (75, 125psi), the inlet and outlet taps are located in
the cover, allowing for the larger capacities needed. Series WFT
traps can also be serviced without disturbing system piping.
Features
• Universal 4-port design
• All stainless steel internal components protect
against erosion and corrosion
• Balanced pressure thermostatic element
• Extra-long life and dependable service
• Water hammer resistant
• Can be serviced without disturbing system piping
Applications
• Unit heaters and other space heating equipment
• Heat exchangers/reboilers
• Air heating coils
• Steam main drips
• Process equipment
Specifications
The float & thermostatic steam trap shall be installed as indicated on the plans. The steam trap shall have a maximum pressure of 125psi and a maximum temperature of 353°F. The trap
body and cover shall be manufactured out of cast iron, the
internal parts and air vents shall be manufactured out of stainless steel. The product shall be a Watts Series WFT.
All 3⁄4", 1" WFT
11⁄4" WFT-15, WTF-30
All 11⁄2", 2" WFT
11⁄4" WFT-75, WTF-125
Materials of Construction
Body & Cover Cast Iron ASTM A126 CIass B
Valve Head Stainless Steel Type 440C
Valve Seat Stainless Steel Type 416
Valve Seat Gasket Stainless Steel Type 416
Float Stainless Steel Type 302
Bracket &Lever Assembly Stainless Steel
Thermostatic Air Vent Balanced Pressure S.S. bellows and valve
Air Vent Seat Stainless Steel Type 316
Cover Bolts Carbon Steel Grade 5
Cover Gasket Non - Asbestos
Draining Plug Stainless Steel
Pressure - Temperature
Maximum Allowable Pressure: 125psi (8.6 bar) @ 353°F (178°C)
Maximum Operating Pressure: controlled by pressure rating of
seat orifice.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
BAA/ARRA Compliant
*
*This product complies with the Buy American Act and The
American Recovery and Reinvestment Act. For more information,
visit watts.com.
MODEL SIZE (DN) DIMENSIONS WEIGHT
ABCDEE1
in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
WFT-15
3
⁄4 20 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-15 1 25 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-15 11⁄4 32 61⁄4 159 53⁄4 146 35⁄16 843765
3
⁄4 146 – – 9.5 4.3
WFT-15 11⁄2 40 81⁄2 216 41⁄4 108 3 76
11
⁄16 17 – – 83⁄8 213 18 8.2
WFT-15 2 50 913⁄16 249 415⁄16 125 415⁄16 125
1
⁄8 39
1
⁄8 231 – – 26 11.8
WFT-30
3
⁄4 20 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-30 1 25 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-30 11⁄4 32 61⁄4 159 53⁄4 146 35⁄16 843765
3
⁄4 146 – - 9.5 4.3
WFT-30 11⁄2 40 81⁄2 216 41⁄4 108 3 76
11
⁄16 17 – – 83⁄8 213 18 8.2
WFT-30 2 50 913⁄16 249 415⁄16 125 415⁄16 125
1
⁄8 39
1
⁄8 231 – – 26 11.8
WFT-75
3
⁄4 20 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-75 1 25 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-75 11⁄4 32 81⁄2 216 41⁄4 108 3 76
11
⁄16 17 – – 83⁄8 213 18 8.2
WFT-75 11⁄2 40 81⁄2 216 41⁄4 108 3 76
11
⁄16 17 – – 83⁄8 213 18 8.2
WFT-75 2 50 913⁄16 249 415⁄16 125 415⁄16 125
1
⁄8 39
1
⁄8 231 – – 26 11.8
WFT-125
3
⁄4 20 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-125 1 25 61⁄4 159 51⁄2 140 35⁄16 843765
3
⁄4 146 – – 9 4.1
WFT-125 11⁄4 32 81⁄2 216 41⁄4 108 3 76
11
⁄16 17 – – 83⁄8 213 18 8.2
WFT-125 11⁄2 40 81⁄2 216 41⁄4 108 3 76
11
⁄16 17 – – 83⁄8 213 18 8.2
WFT-125 2 50 913⁄16 249 415⁄16 125 415⁄16 125
1
⁄8 39
1
⁄8 231 – – 26 11.8
A
E
C
A
E
E1
C
B
D
B
D
All
3
⁄4", 1" WFT, 11⁄4" WFT-15, WTF-30
All 1
1
⁄2", 2" WFT, 11⁄4" WFT-75, WTF-125
DIFFERENTIAL PRESSURE (psi)
Size psi
Model NPT Orifice1⁄4
1
⁄2 1 2 5 10 15 20 25 30 40 50 75 100 125
WFT-153⁄4" .218 279 369 489 650 785 1000 1075
WFT-15 1" .218 279 369 489 650 785 1000 1075
WFT-15 11⁄4" .312 600 770 980 1240 1640 2000 2340
WFT-15 11⁄2" .500 1100 1700 2400 3300 5000 6600 7600
WFT-15 2" .625 2300 2800 3600 4650 6900 9000 10900
WFT-303⁄4" .218 279 369 489 650 785 1000 1075 1210 1300 1370
WFT-30 1" .218 279 369 489 650 785 1000 1075 1210 1300 1370
WFT-30 11⁄4" .228 375 500 690 910 1200 1500 1680 1800 1900 2000
WFT-30 11⁄2" .390 1000 1300 1700 2300 3400 4600 5500 6000 6600 7000
WFT-30 2" .500 1300 1800 2500 3400 5200 6800 7800 8600 9300 10000
WFT-753⁄4" .166 160 213 280 365 520 700 795 875 930 970 1120 1230 1450
WFT-75 1" .166 160 213 280 365 520 700 795 875 930 970 1120 1230 1450
WFT-75 11⁄4" .312 550 725 960 1300 1900 2650 3050 3400 3700 4000 4400 4750 5400
WFT-75 11⁄2" .312 550 725 960 1300 1900 2650 3050 3400 3700 4000 4400 4750 5400
WFT-75 2" .421 850 1100 1500 2000 3100 4150 4750 5200 5500 5800 6400 6800 7700
WFT-1253⁄4" .125 100 135 175 230 330 415 500 585 620 685 750 830 970 1110 1190
WFT-125 1" .125 100 135 175 230 330 415 500 585 620 685 750 830 970 1110 1190
WFT-125 11⁄4" .246 400 520 680 890 1300 1700 2050 2300 2500 2700 3000 3200 3800 4200 4500
WFT-125 11⁄2" .246 400 520 680 890 1300 1700 2050 2300 2500 2700 3000 3200 3800 4200 4500
WFT-125 2" .332 550 675 880 1225 1950 2600 3000 3250 3500 3800 4200 4600 5500 6100 6600
Steam Trap Capacities in (lbs./hr.) Hot Condensate
Dimensions — Weights
ES-WFT 1038 © 2010 Watts
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
A Watts Water Technologies Company
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