Control Products NFT252 User Manual

Applications

● Steam Lines ● Unit Heaters

● Process Equipment ● Oil Preheaters

● Steam Cookers ● Converters

● Steam Heated Vats ● Coils

● Pressing Machinery ● Rotating Drum

Proven Caged Stainless Steel

Balanced Pressure Thermostatic Air Vent

automatically discharges air and

non-condensables

Stainless Steel Strainer

with large screen area

prevents dirt problems

Connections

Sizes 1/2” – 2” screwed

NPT (BSPT optional)

Sizes 11/2” & 2” flanged

ANSI 250

Weighted Stainless Steel

Free Float Ball

multi-contact surface area

modulates orifice discharge to

provide smooth, continuous

discharge and immediate

response to load variations

Stainless Steel Sleeve

eliminates body erosion

Stainless Steel Seat

full bore prevents choking

and permits ample capacities

Liquid Level

maintains seal over orifice

to prevent live steam loss

Bottom & Side

Blowdown Connections

for preventative maintenance

Guarantee

Traps are guaranteed against defects

in materials or workmanship for 3 years.

- 314 -

NOVA NFT250

FEATURES

NOVA

NFT250 Series

Variable Orifice

Steam Traps

Pressures To 250 PSIG
Temperatures to 450°F

- 318 -

NOVA NFT250 SERIES

VARIABLE ORIFICE TRAP

On startup, the thermostatic air vent (caged stainless
welded bellows) is open, allowing air to flow freely
through the vent valve orifice. When condensate flows
into the trap, the float rises, allowing condensate to
be discharged. Once air and non-condensibles have
been evacuated, hot condensate will cause the therm­ostatic vent to close. Condensate will continue to be
discharged as long as condensation occurs.

During normal operation, an increase in the load causes
the liquid level in the trap to rise. The float then rises and
rolls off the seat ring, allowing more condensate to flow
out. The float sinks as the condensate load decreases,
moving nearer to the seat ring, decreasing the effective
size of the orifice and allowing less condensate to dis­charge. This provides smooth, continuous operation that
reacts instantly to load variation while maintaining a
water seal over the seat ring to prevent live steam loss.

NOVA NFT250 SERIES

VARIABLE ORIFICE

STEAM TRAPS

Pressures To 250 PSIG (17.2 barg)

Temperatures to 450°F (232°C)

All Stainless Steel Internal Components — Hardened

valves and seats. Extra long life and dependable service.
Resists water hammer. Protects against erosion and
corrosion.

Erosion Proof — Discharge passage is protected with a

stainless steel liner.

Integral Strainer — Stainless Steel screen prevents dirt

problems. Blow-down connection provided.

Thermostatic Air Vent — Full balanced pressure element

for immediate and complete air venting.

Variable Orifice — Condensate is discharged continuously

through the seat ring which is modulated by the float. This
provides a smooth, even flow without high velocity or
steam entrainment.

SLR Orifice — Optional continuous bleed prevents flash

steam lockup when it is impossible to install trap at low
point in system.

Guarantee — Traps are guaranteed against defects in

materials or workmanship for 3 years.

MODELS

●

NFT250–Low capacity

●NFT251–Medium capacity

●NFT252–High capacity

●NFT253–Super high capacity

APPLICA TIONS

●

Steam Lines

●Process Equipment

●Steam Cookers

●Steam Heated Vats

●Pressing Machinery

●Unit Heaters

●Oil Preheaters

●Converters

●Coils

●Rotating Drum

OPTIONS

●

SLR - SLR Orifice

●B - Blowdown Valve

●Orifice Continuous Bleed Air Vent

●250# - 250# Flanged Connection*

*Available on NFT 253 only.

Canadian Registration # OE0591.9C

OPERA TION

Installation Tip: Always install STV Test & Block Valve as part of trap station

SEE PAGE 354

Installation Tip: Add Uniflex Pipe Coupling for ease of maintenance

SEE PAGE 374

A

B

D

Clearance for Maintenance

C

Connections:

1

⁄2"-2" NPT or 11⁄2"-2" Flanged

Steam trap shall be of float and thermostatic design. Float shall be free
of levers, linkages, or other mechanical connections. Float shall be
weighted to maintain orientation and shall act as the valve being free
to modulate condensate through the seat ring. Air vent shall be of
balanced pressure design with stainless steel welded encapsulated
bellows capable of discharging air and noncondensable gases contin­uously within 15°F of saturated temperature. Trap shall contain
integral strainer and stainless steel exhaust port sleeve. Trap shall be
cast iron bodied suitable for pressures to 250 psi and available in 1/2"
through 2" NPT or flanged.

NOVA NFT250 SERIES

VARIABLE ORIFICE

STEAM TRAPS

SPECIFICATION

MAXIMUM OPERATING CONDITIONS

PMO: Max. Operating Pressure

ORIFICE PMO

20 20 psig (1.4 barg)

50 50 psig (3.5 barg)
100 100 psig (6.9 barg)
150 150 psig (10.3 barg)
250 250 psig (17.2 barg)

PMA: Max. Allowable Pressure:

250 psig (17.2 barg)

TMA: Max. Allowable Temperature:

450°F (232°C)

Dimensions

Inches (mm)

Weight

Model Size Connection Lbs.

A B C D (kg)

NFT250

1

/2 & 3/4 NPT 41/4 23/4 35/8 51/2 6

(108) (69) (92) (140) (2.7)

NFT251

3

/4 & 1 NPT 51/2 215/16 49/16 63/4 13

(140) (74) (116) (171) (5.9)

NFT252†1 & 11/2 NPT 11 215/16 73/4 10 41

(279) (74) (197) (254) (18.6)

NPT 133/4 215/16 115/8 153/8 120

NFT253 11/2 & 2

(349) (74) (295) (391) (54.5)

250# Flg. 153/4 215/16 115/8 153/8 130

(400) (74) (295) (391) (59.1)

A

B

C

D

Clearance for Maintenance

Maximum Capacity–lbs/hr (10°F Below Saturation)

Orifice

Differential – PSIG (barg)

Trap Size Max. 1 5 10 15 20 30 50 75 100 125 150 175 200 225 250

∆P

(.07) (.34) (.69) (1.03) (1.38) (2.07) (3.45) (5.17) (6.90) (8.62) (10.3) (12.1) (13.8) (15.5) (17.2)

0.193 20 264 810 1050 1100 1200

0.141 50 190 430 610 750 870 1070 1400

NFT250 0.102 100 88 160 250 300 350 425 530 670 710

0.091 150 70 140 219 260 295 345 410 470 520 555 590

0.067 250 37 90 140 170 200 240 300 340 390 405 415 440 460 480 500

0.277 20 590 1600 2100 2400 2450

0.209 50 340 760 1080 1330 1540 1900 2460

NFT251 0.157 100 200 500 650 740 830 950 1100 1300 1400

0.141 150 170 385 527 627 705 825 990 1130 1240 1330 1415

0.120 250 110 255 360 425 500 575 700 800 900 940 1000 1050 1100 1150 1200

0.593 20 2720 6280 8600 10500 11700

0.469 50 1750 3920 5560 6830 7900 9700 12600

NFT252 0.339 100 930 2170 3130 3840 4460 4990 6020 7030 7960

0.316 150 850 1935 2650 3150 3540 4140 4970 5685 6230 6690 7100

0.261 250 670 1400 1900 2400 2540 3000 3500 4100 4200 4900 5100 5300 5500 5750 6000

1.102 20 8000 15000 18000 19900 22800

0.875 50 5460 12600 15600 16900 18400 21000 25400

NFT253 0.593 100 2800 6350 8700 10900 12800 13700 16600 18700 21000

0.578 150 2690 6120 8385 9970 11200 13100 15700 17980 19700 21150 22450

0.484 250 1600 3770 5300 6470 7560 8610 10400 12100 13600 14600 15500 16300 17100 17800 18400

For Kg/Hr Multiply by .454

MATERIALS OF

CONSTRUCTION

Body and Cover . . . . . . . .Cast Iron ASTM A126B

All Internal Parts . . . . . . . . . . . . . . .Stainless Steel

Air Vent . . . . . .Balanced Pressure, Stainless Steel

Cover Gasket . . . . . . . . . . . . . . . . .Graphite Fiber

- 319 -

NOVA NFT250 SERIES

VARIABLE ORIFICE TRAP

- 320 -

NOVA NFT650 SERIES

VARIABLE ORIFICE TRAP

On startup, the thermostatic air vent (caged
stainless welded bellows) is open, allowing air to
flow freely through the vent valve orifice. When
condensate flows into the trap, the float rises,
allowing condensate to be discharged. Once air and
non-condensibles have been evacuated, hot
condensate will cause the thermostatic vent to
close. Condensate will continue to be discharged as
long as condensation occurs.

During normal operation, an increase in the load causes
the liquid level in the trap to rise. The float then rises and
rolls off the seat ring, allowing more condensate to flow
out. The float sinks as the condensate load decreases,
moving nearer to the seat ring, decreasing the effective
size of the orifice and allowing less condensate to dis­charge. This provides smooth, continuous operation that
reacts instantly to load variation while maintaining a
water seal over the seat ring to prevent live steam loss.

NOVA NFT650 SERIES

VARIABLE ORIFICE

STEAM TRAPS

Pressures To 650 PSIG (44.8 barg)

Temperatures to 750°F (400°C)

All Stainless Steel Internal Components — Hardened

valves and seats. Extra long life and dependable service.
Resists water hammer. Protects against erosion and
corrosion.

Erosion Proof — Discharge passage is protected with a

stainless steel liner.

Integral Strainer — Stainless Steel screen prevents dirt

problems. Blow-down connection provided.

Thermostatic Air Vent —Provided with balanced pressure

element for immediate and complete air venting.

Variable Orifice — Condensate is discharged continuously

through the seat ring which is modulated by the float. This
provides a smooth, even flow without high velocity or
steam entrainment.

SLR Orifice — Optional continuous bleed prevents flash

steam lockup when it is impossible to install trap at low
point in system.

Guarantee — Traps are guaranteed against defects in

materials or workmanship for 3 years.

M

ODELS

●

NFT651–Low capacity

●NFT652–Medium capacity

●NFT653–High capacity

APPLICA TIONS

●

Steam Lines

●Process Equipment

●Steam Cookers

●Steam Heated Vats

●Pressing Machinery

●Unit Heaters

●Oil Preheaters

●Converters

●Coils

●Rotating Drum

O

PTIONS

●

SLR - SLR Orifice

●B - Blowdown Valve

●Continuous Bleed Air Vent

●300# or 600# Flanged Connection*

*Available on NFT652 and NFT653 only.

Canadian Registration # OE0591.9C

OPERA TION

Installation Tip: Always install STV Test & Block Valve as part of trap station

SEE PAGE 354

Installation Tip: Add Uniflex Pipe Coupling for ease of maintenance

SEE PAGE 374

Steam trap shall be of float and thermostatic design. Float shall be free
of levers, linkages, or other mechanical connections. Float shall be
weighted to maintain orientation and shall act as the valve being free
to modulate condensate through the seat ring. Air vent shall be of
balanced pressure design with stainless steel welded encapsulated
bellows capable of discharging air and noncondensable gases
continuously within 15°F of saturated temperature. Trap shall contain
integral strainer and stainless steel exhaust port sleeve. Trap shall be
cast steel bodied suitable for pressures to 650 psi and available in
1/2" through 2" NPT, Socket Weld, or flanged.

NOVA NFT650 SERIES

VARIABLE ORIFICE

STEAM TRAPS

S

PECIFICATION

A

B

C

D

Clearance for Maintenance

A

B

C

Clearance for Maintenance

D

M

AXIMUM OPERATING

CONDITIONS

PMO: Max. Operating Pressure

ORIFICE PMO

20 20 psig (1.4 barg)

50 50 psig (3.5 barg)
100 100 psig (6.9 barg)
175 175 psig (12.1 barg)
300 300 psig (20.7 barg)
400 400 psig (27.6 barg)
600 600 psig (41.4 barg)

PMA

: Max. Allowable Pressure:

650 psig (44.8 barg)

TMA: Max. Allowable Temperature:

750°F (400°C)

Dimensions

Inches (mm)

Weight

Model Size

ABCD

Lbs.

NPT 300# 600#

(kg)

NFT6511/2, 3/4 & 1 51/2— —31/16 57/16 71/4 21

(140) (78) (138) (184) (9.5)

11113

3

/4 133/4 215/16 83/4 113/8 84

NFT652

(279) (349) (349) (75) (222) (290) (38.2)

11/2 & 2 11 133/4 149/16 215/16 83/4 113/8 87

(279) (349) (370) (75) (222) (290) (39.5)

11/2 133/4 163/4 173/8 35/16 117/8 16 192

NFT653

(349) (426) (411) (84) (392) (406) (87.3)

213

3

/4 1611/16 177/16 35/16 117/8 16 195

(349) (424) (443) (84) (302) (406) (88.6)

For Kg/Hr Multiply by .454

MATERIALS OF

CONSTRUCTION

Body & Cover . . . . . .ASTM A216 Grade WCB

Cover Gasket . . . . .Spiral Wound 304 Stainless

w/graphite filler

All Internal . . . . . . . . . . . . . . . . .Stainless Steel

Air Vent . . .Balanced Pressure, Stainless Steel

Connections:

1

⁄2-2" NPT or 11⁄2-2" Flanged

Maximum Capacity - lbs/hr (10 degrees Below Saturation)

Trap Orifice MAX Differential - PSIG (barg)

Size

∆P

1 5 10 20 50 75 100 150 175 200 250 300 400 500 600

(.07) (.34) (.69) (1.38) (3.45) (5.17) (6.90) (10.3) (12.1) (13.8) (17.2) (20.7) (27.6) (34.5) (41.4)

0.277 20 590 1600 2100 2450

0.209 50 340 760 1080 1540 2460

0.157 100 200 500 650 830 1100 1300 1400

0.141 150 170 385 527 705 990 1130 1240 1415

NFT651 0.130 175 180 350 500 675 900 1000 1100 1300 1400

0.120 250 110 255 360 500 700 800 900 1000 1050 1100 1200

0.106 300 105 240 330 435 575 675 750 875 955 1020 1140 1255

0.096 400 100 220 300 390 510 585 640 740 795 835 920 1000 1140

0.081 600 75 145 180 225 300 340 375 435 465 490 540 585 665 740 800

0.593 20 2720 6280 8600 11700

0.469 50 1750 3920 5560 7900 12600

0.339 100 930 2170 3130 4460 6020 7030 7960

0.316 150 850 1935 2650 3540 4970 5685 6230 7100

NFT652 0.297 175 800 1700 2300 3200 4400 5000 5500 6400 6900

0.261 250 670 1400 1900 2540 3500 4100 4200 5100 5300 5500 6000

0.238 300 645 1240 1565 1955 2575 2940 3220 3740 4000 4220 4640 5060

0.213 400 515 995 1250 1565 2060 2355 2575 2995 3200 3380 3720 4050 4600

0.180 600 370 710 895 1120 1470 1680 1840 2140 2290 2410 2655 2890 3300 3655 3955

1.102 20 8000 15000 18000 22800

0.875 50 5460 12600 15600 18400 25400

0.593 100 2800 6350 8700 12800 16600 18700 21000

0.578 150 2690 6120 8385 11200 15700 17980 19700 22450

NFT653 0.547 175 2400 5500 7600 10300 14400 16500 18200 20750 21900

0.484 250 1600 3770 5300 7560 10400 12100 13600 15500 16300 17100 18400

0.453 300 1500 3500 5200 7075 9325 10655 11655 13545 14485 15275 16815 18315

0.404 400 1400 2800 4200 5630 7420 8480 9270 10770 11520 12150 13380 14570 16555

0.339 600 800 1800 2800 3900 5220 5970 6530 7585 8110 8555 9420 10260 11655 12960 13990

- 321 -

NOVA NFT650 SERIES

VARIABLE ORIFICE TRAP