12
845.778.5566 ● Fax: 845.778.7123 ●
www.nicholsonsteamtrap.com
Thermal actuator is filled at its free length with a
liquid having a lower boiling point than water. On
start-up, valve is normally open. When steam
enters trap, thermal actuator fill vaporizes to a
pressure higher than line pressure. This forces
valve into seat orifice to prevent any further flow.
As condensate collects, it takes heat from thermal
actuator, lowering internal pressure. Line pressure will
then compress thermal actuator to open valve and
discharge condensate. Valve opening automatically
adjusts to load conditions from minimum on very light
loads to full lift at maximum load. Restricted orifice in
N125L (small opening at bottom of valve seat) prevents
trap from discharging continuously on light loads.
N125 SERIES
THERMOSTATIC
STEAM TRAPS
Pressures to 125 PSIG (8.75 barg)
Temperatures to 400°F (204°C)
Superior Performance — Hardened valve and seats are
lapped in matched sets, providing tight shutoff and long
service life.
Improved Energy Savings — Maximum elimination of air
and non-condensibles–trap closes at saturated steam
temperature.
Temperature Sensitive Actuators — One moving part.
Stainless Steel, fail open or fail closed, welded actuator
for maximum corrosion, thermal and hydraulic shock
resistance.
Freeze Proof — Threaded male union horizontal inlet
and vertical outlet–self draining.
In-line Maintenance — Threaded cover for one step
removal, inspection and service without breaking pipe
connections.
Air Vent — Efficient steam service air vent when
equipped with ISO Bellows and installed in air vent
location.
Guaranteed — Guaranteed against defects in materials
or workmanship for 3 years.
M
ODELS*
● N125 – Standard capacity
● N125L – Low capacity
● N125HC – High capacity
● N125ST-FC – Standard capacity w/sterilizer seat
● N125STHC-FC–High capacity w/sterlizer seat
*Add (-FC) for fail closed or (-FO) for fail open to end of model number
APPLICA TIONS
●
Steam Tracing
●Drip Legs
●Automatic Air Vents
●Sterilizers
●Cooking Kettles
●Water Heaters
●Laundry Equipment
●Radiators
●Process Equipment
●Air Handlers
OPTIONS
●
ST - Sterilizer Trim (1/4 & 5/16 orifice sizes)
●SLR - SLR Orifice
●S - Internal Stainless Strainer
●ISO - ISO Filled Actuator
●HC - High Capacity
Canadian Registration # 0E0591.9
See page 9
O
PERATION
845.778.5566 ● Fax: 845.778.7123 ●
www.nicholsonsteamtrap.com
13
Connections: 3/8"–3/4" NPT
N125 SERIES
THERMOSTATIC
STEAM TRAPS
SPECIFICATION
Steam trap shall be of balanced pressure design with stainless
steel welded actuator capable of discharging condensate within
10°F of saturated temperature. Where greater sensitivity is
required, SLR orifice and Sterilizer trim will be available to allow
condensate evacuation at or near saturated temperatures. Where
subcooling of condensate is desired alternate thermostatic
actuator will be available to allow condensate evacuation at or
near 40°F below saturated temperatures. Thermostatic actuator
shall employ a conical valve lapped in matched sets with the seat
ring assuring tight shut off. A minimum of three orifice sizes shall
be available allowing for custom capacity sizing. Trap shall be
bronze bodied suitable for pressures through 125 psig and
available in 3/8" through 3/4" NPT connections.
M
AXIMUM OPERATING
CONDITIONS
PMO:Max. Operating Pressure 125 psig (8.75 barg)
TMO: Max. Operating Temperature 400°F (204°C)
PMA: Max. Allowable Pressure 125 psig (8.75 barg)
TMA: Max. Allowable Temperature 400°F (204°F)
MATERIALS OF CONSTRUCTION
Body & Cover……………………… ASTM B283 C37700
Actuator……………………………Welded Stainless Steel
Cover Gasket ……………………………Copper Jacketed
Valve & Seat ………………Hardened 416 Stainless Steel
D
C
A
B
Maximum Capacity—lbs/hr 10°F Below Saturation (Kg/hr 5°C Below Saturation)
Trap
Orifice
Differential PSIG (barg)
Inch 5 10 20 50 100 125
(mm) (0.34) (0.7) (1.4) (3.5) (6.9) (8.6)
N125L
1/8 216 265 375 592 778 838
(3) (98) (120) (170) (269) (354) (383)
N125 1/4 550 825 1210 1975 2825 3140
N125ST (6) (249) (374) (549) (896) (1281) (1424)
N125HC 5/16 860 1220 1725 2725 3575 3850
N125STHC (8) (390) (554) (783) (1237) (1623) (1748)
Nicholson recommends ISO filled Actuator for superheated steam.
Dimensions
Inch (mm) Weight
Size lb
A B C D (kg)
3
⁄8, 1⁄2 23⁄4 11⁄8 27⁄8
25
⁄32 1.5
(70) (29) (73) (54) (.68)
3
⁄4 33⁄16 19⁄16 3
25
⁄32 1.8
(81) (40) (76) (54) (.82)
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