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 different 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 |
Example 1 |
intermediate pressure as pressure signal to the |
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2-stage refrigeration system built up with a |
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combined LP/HP compressor. |
injection valve. |
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In this case the discharge gas temperature on |
In this example a TXI 2 injection valve is used, see |
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the HP side is used as temperature signal and the |
fig. 1. |
Fig. 1
Application examples |
Example 2 |
(continued) |
2-stage refrigeration system with 2 separate |
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refrigerating compressors in series. In this set up |
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a solution with injection valve type TXI 2 can be |
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used, because the discharge gas temperature on |
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
LP: Low pressure
HP: High pressure
PI: intermediate pressure
the HP side can be used as temperature signal and the intermediate pressure as pressure signal to the injection valve, see fig. 2.
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 fig. 3.
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LP: Low pressure compressor |
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Fig. 3 |
HP: High pressure compressor |
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PI: Intermediate pressure |
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© Danfoss | DCS (sw | 2015.12 |
DKRCC.PD.AV0.A3.02 | 520H10558 | 2 |
Data sheet | Injection valve type TXI 2
Operation
Danfoss 68-651.10
Fig. 4
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 (fig. 4).
Pbulb
Pspring
PI
© Danfoss | DCS (sw | 2015.12 |
DKRCC.PD.AV0.A3.02 | 520H10558 | 3 |