172-65134A-03 (NF6) 16 Dec 2019
4
3. Install the non-freeze valve at the proper location on the steam trap so that the
flow direction of the valve matches with that of condensate. (See the
“Disassembly/Reassembly” section for the proper torque.)
4. Install outlet piping. Make sure that the internal diameter of the pipe and joints are
thick and short with an inner diameter of ø6 mm (
15
/
64
) or larger.
5. Do not install a needle or other valve at the outlet (except for full-bore ball valves).
6. Open the inlet and outlet valves of the steam trap and allow the trap to operate
normally. After that, close the inlet and outlet valves and check to make sure that
the non-freeze valve opens and functions properly when the internal pressure
(temperature) decreases.
If there is a problem, determine the cause using the “Troubleshooting” section in this
manual.
Special Considerations for Product Use
1. Outlet pipe should have as steep a downward incline as possible so that
the condensate can smoothly and rapidly flow out from the pipe.
Condensate needs to be discharged from the piping before the temperature
decreases below the freezing point. This product cannot function once freezing
has occurred at the outlet side. Do not recover the condensate.
2. Outlet piping should be as thick and as short as possible.
Freezing occurs from the outside of the outlet pipe. If the outlet pipe is thin and
long, the condensate temperature can decrease while flowing, gradually freezing
along the pipe’s inner surface. Eventually, the pipe may become blocked, with
condensate backing up and freezing in the steam trap, possibly causing damage.
To prevent such an occurrence, the outlet pipe should be as thick and as short as
possible with an internal diameter ø6 mm (
15
/
64
) or larger and discharge to
atmosphere. When used in extreme cold, due to the possibility of freezing while
discharging, prevention of freezing cannot be guaranteed.
3. Relation between required inlet pressure and length of NF6 outlet pipe.
If there are any bends, or the pipe length is long, outlet pressure of NF6
increases due to high resistance from the pipe, and the valve may not close. To
avoid such a phenomenon, use the non-freeze valve on a steam trap with an inlet
pressure shown on the following graph.
0
0.05
0.1
0.15
0.2
0 0.5 1 1.5 2 2.5 3 3.5
10
5
0
30
20
10
0
S
team
T
rap I
nl
et
P
res
s
ur
e
(MP
aG
)
S
team
T
rap I
nl
et
P
res
s
ur
e
(p
s
ig
)
Maximum Pipe Length* (m)
Maximum Pipe Length* (ft)
Use the non-freeze
valve on a steam trap
with an inlet pressure
as shown on the graph
* ø6 mm (
15
/
64
) or larger
internal diameter and
bending at no more than
3 locations.
