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N650 Series
Specifications
This section lists the specifications for the N650 Series. Factory specifications are stamped on the nameplate
fastened on the steam trap at the factory.
Available Configuration
Type N651-FO: Y pattern body withstrainer and
blowdown port tapped and plugged; low capacity,
fail open
Type N652
: Reduced capacity
(1)
Type N653
: Standard capacity
(1)
Type N654
: High capacity
(1)
Body Size
NPS 1/2 and 3/4 / DN 15 and 20
End Connection
NPT and Socket Weld
Maximum Operating Pressure
Standard Traps: 500 psig / 34.5 bar g
ISO Option Traps: 650 psig / 44.8 bar g
Maximum Allowable Pressure
650 psig / 44.8 bar g
Maximum Operating Temperature
Standard Traps: 600°F / 316°C
ISO Option Traps: 650°F / 343°C
Maximum Allowable Temperature
750°F / 399°C
Materials of Construction
Body and Cover: Forged steel
Actuator: Welded Stainless Steel
1. Add (-FC) for fail closed or (-FO) for fail open to end of type number.
2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
3. Emerson Process Management Regulator Technologies, Inc. (Emerson) recommends ISO filled Actuator above 500 psi / 34.5 bar and for superheated steam. Emerson recommends
skirted seat above 300 psi / 20.7 bar.
Principle of Operation
Thermal actuator is filled at its free length with a
liquid having a lower boiling point than water. As
assembled, valve is normally open. When very hot
condensate 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 the 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. Optional blowdown
valve allows fast and easy cleaning of internal strainer
without removing trap from operation.
2
(2)
(2)
(2)
(2)
Cover Gasket: Stainless Steel Spiral Wound with
Graphite Fill
Strainer and Blowdon Valve: Stainless Steel
Valve and Seat: Hardened 416 Stainless Steel
Applications
Unit Heaters
Air Vents
Steam Tracing
Drip Legs
Platen Presses
Plating Tanks
Sterilizers
Tire Presses
Cooking Equipment
Laundry Equipment
Other Process Equipment
Options
B: Blowdown Valve
ISO: ISO Filled Actuator
SK: Skirted Seat
(3)
SLR: SLR Orifice
SW: Socket weld
Approximate Weight
5 lbs / 2.3 kg
Installation
▲
WARNING
Personal injury or system damage may
result if this steam trap is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given in the
Specifications section and/or steam
trap nameplate.
Additionally, physical damage to the
steam trap may result in personal injury
or property damage due to escaping of
accumulated gas. To avoid such injury
and damage, install the steam trap in a
safe location.
(3)
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