Danfoss TXI 2 Data sheet
Data sheet
Injection valve
Type TXI 2
The TXI2 is an injection valve for desuperheating
in 2-stage refrigeration systems operating on
R22/R407C and other similar refrigerants where
the hot gas temperature and the intermediate
pressure are the controlling variables.
Application
In principle there are two dierent ways in which
to setup 2-stage refrigeration systems as far as
temperature signal to the liquid injection valve is
concerned.
© Danfoss | DCS (sw) | 2015.12
DKRCC.PD.AV0.A3.02 | 520H10558 | 1
Data sheet | Injection valve type TXI 2
Application examples
Application examples
(continued)
Example 1
2-stage refrigeration system built up with a
combined LP/HP compressor.
In this case the discharge gas temperature on
the HP side is used as temperature signal and the
Fig. 1
Example 2
2-stage refrigeration system with 2 separate
refrigerating compressors in series. In this set up
a solution with injection valve type TXI 2 can be
used, because the discharge gas temperature on
intermediate pressure as pressure signal to the
injection valve.
In this example a TXI 2 injection valve is used, see
g. 1.
LP: Low pressure
HP: High pressure
PI: intermediate pressure
the HP side can be used as temperature signal
and the inter mediate pressure as pressure signal
to the injection valve, see g. 2.
Fig. 2
Example 3
Same setup as in example 2 with 2 separate
refrigerating compressors in series. As in this
setup there is an accessible control signal where
there is correspondence between pressure
and temperature, regulation of the strongly
Fig. 3
LP: Low pressure compressor
HP: High pressure compressor
PI: Intermediate pressure
superheated condition of the refrigerant can
be undertaken by a traditional thermostatic
expansion valve e.g. Danfoss type TX 2 for
R22/R407C refrigeration systems, see g. 3.
LP: Low pressure compressor
HP: High pressure compressor
PI: Intermediate pressure
© Danfoss | DCS (sw | 2015.12
DKRCC.PD.AV0.A3.02 | 520H10558 | 2
Data sheet | Injection valve type TXI 2
Operation
Fig. 4
Danfoss
68-651.10
P
P
PI
bulb
spring
The valve function is controlled by the
intermediate pressure (PI) acting under the
diaphragm and the bulb pressure derived
from the discharge gas temperature across the
diaphragm (g. 4).
© Danfoss | DCS (sw | 2015.12
DKRCC.PD.AV0.A3.02 | 520H10558 | 3
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