Float and Thermostatic/Free Float Traps

One of the most prevalent of technologies among manufacturers, this type of steam trap consists of a small reservoir, a float, a thermostat and usually a mechanical arm joining the float to the disc and seat assembly.

Operation :
before condensation reaches the trap, the air vent thermostat is fully open to discharge air and gasses. As hot condensate and steam arrive, the air vent closes and the condensate lifts the float allowing the liquid to flow out of the trap.

Advantages :
- no backup of Condensate;
- Precise;
- Large capacities;
- moderate to excellent modulation;
- Can be very resistant to scale and debris;
- With the thermostat, has excellent air discharge capacity.

Disadvantages :
- Cannot eliminate air without the thermostat;
- A single orientation;
- large size;
- Various orifices and body sizes for various pressures and capacities;
- Sensitive to water hammer and steam lock
NFT 250 series ­ Free float - Four available models :

NFT 250
Maximum working pressure of 250 PSI ­ 1/2" and 3/4" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 20 PSI : 1,200
• @ 100 PSI : 710
• @ 150 PSI : 590

NFT 251
Maximum working pressure of 250 PSI ­ 3/4" and 1" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 20 PSI : 2,450
• @ 100 PSI : 1,400
• @ 150 PSI : 1,415

NFT 252
Maximum working pressure of 250 PSI ­ 1" and 1 1/2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 20 PSI : 11,700
• @ 100 PSI : 7,960
• @ 150 PSI : 7,100

NFT 253
Maximum working pressure of 250 PSI ­ 1 1/2" and 2" NPT Connections as well as optional 250# flanges
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 20 PSI : 22,800
• @ 100 PSI : 21,000
• @ 150 PSI : 22,450

Data sheet for the  installation and maintenance of the NFT 250 series
NFT 650 series ­ Free Float - Three available models :

NFT 651
Maximum working pressure of 650 PSI ­ 1/2" to 1" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 100 PSI : 1,400
• @ 400 PSI : 1,140
• @ 600 PSI : 800

NFT 652
Maximum working pressure of 650 PSI ­ 1" to 2" NPT Connections, optional 300# or 600# flanges
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 100 PSI : 7,960
• @ 400 PSI : 4,600
• @ 600 PSI : 3,955

NFT 653
Maximum working pressure of 650 PSI ­ 1 1/2" and 2" NPT Connections, optional 300# or 600# flanges
Maximum Capacity ( in lbs/hr 10º below saturation)
• @ 100 PSI : 21,000
• @ 400 PSI : 16,555
• @ 600 PSI : 13,990
FTN Series ­ Float and Thermostatic - Four available models

FTN 15
Maximum working pressure of 15 PSI ­ 3/4" to 2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 3/4" @ 15 PSI : 1,075
• 1 1/2" @ 15 PSI : 7,600
• 2" @ 15 PSI : 10,900

FTN 30
Maximum working pressure of 30 PSI ­ 3/4" to 2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 3/4" @ 30 PSI : 1,370
• 1 1/2" @ 30 PSI : 7,000
• 2" @ 30 PSI : 10,000

FTN 75
Maximum working pressure of 75 PSI ­ 3/4" to 2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 3/4" @ 75 PSI : 1,450
• 1 1/2" @ 75 PSI : 5,400
• 2" @ 75 PSI : 7,700

FTN 125
Maximum working pressure of 125 PSI ­ 3/4" to 2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 3/4" @ 125 PSI : 1,190
• 1 1/2" @ 125 PSI : 4,500
• 2" @ 125 PSI : 6,600

Data sheet for the installation and maintenance of FTNs
Max-Flo - Super High Capacity - Float and Thermostatic - Five available models :

HC 15
Maximum working pressure of 15 PSI ­ 2" and 2 1/2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 2" @ 5 PSI : 15,500
• 2" @ 15 PSI : 24,000
• 2 1/2" @ 15 PSI : 60,000

HC 30
Maximum working pressure of 30 PSI ­ 2" and 2 1/2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 2" @ 5 PSI : 12,500
• 2" @ 30 PSI : 24,000
• 2 1/2" @ 30 PSI : 55,600

HC 75
Maximum working pressure of 75 PSI ­ 2" and 2 1/2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 2" @ 5 PSI : 7,600
• 2" @ 75 PSI : 20,500
• 2 1/2" @ 75 PSI : 52,300

HC 125
Maximum working pressure of 15 PSI ­ 2" and 2 1/2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 2" @ 5 PSI : 5,450
• 2" @ 125 PSI : 21,800
• 2 1/2" @ 125 PSI : 46,000

HC 175
Maximum working pressure of 15 PSI ­ 1 1/4"" to 2 1/2" NPT Connections
Maximum Capacity ( in lbs/hr 10º below saturation)
• 1 1/4" @ 175 PSI : 3,240
• 2" @ 175 PSI : 18,000
• 2 1/2" @ 175 PSI : 46,200