Figure 2: Double balanced port design TGE 20 and TGE 40
Balanced port design and advantage
The TGE series of thermostatic expansion valves have balanced port design.
Balanced port design prevents changes in pressure drop across the valve from inuencing operation and provides
excellent control on applications having widely varying operating conditions.
Balanced port TXV’s are recommended in refrigeration and air conditioning systems with any combinations of these
conditions:
1.
Widely varying head pressures
2.
Widely varying evaporator loads
3.
Widely varying pressure drop across the TXV
4.
Fluctuating or extremely low liquid temperatures
5.
Intermittent liquid line ash gas
TGE valves are designed for biow operations. TGE 10 has minor capacity reduction in reverse ow.
The central push pin is tted with a robust seal (Pos 4) that ensures maximum tightness for the life of the valve.
Static superheat (SS) can be adjusted by the setting spindle (Pos 7), see Figure 1: Balanced port design TGE 10
& .Figure 2: Double balanced port design TGE 20 and TGE 40
The standard superheat setting (SS) is 4K / 7.2 °F and adjustable for 0 – 8K / 0 – 14.4 °F.
SS = Static Superheat
OS = Opening Superheat
SH = SS + OS = total superheat
Example:
Static superheat SS = 4K / 7.2 °F
Opening superheat OS = 4K / 7.2 °F
The opening superheat is 4K / 7.2 °F, i.e. from the point the valve begins to open up to rated capacity. Opening
superheat is determined by the design and cannot be changed.
Total superheat SH = SS + OS
SH = 4 + 4 = 8K / 14.4 °F
Total superheat SH can be altered by changing SS (by using the setting spindle).
Figure 3: A diagram of a traditional refrigeration plant where TGE is used for ow in one direction only.
Figure 4: A conventional split heat pump system shown in cooling mode. This system has two TGE thermostatic expansion
valves with xed direction ow. An NRV check valve is placed in series with each TGE to allow liquid refrigerant to bypass
when ow is opposite the TXV xed direction
Figure 5: A heat pump system similar to that in g. 4 but with a more compact design, where the distance between
evaporator and condenser is very short. This system has only one bi–ow TGE valve metering liquid refrigerant eectively in
both directions. Changeover is by means of a 4–way valve. A suction lter drier is often placed in suction lines just before the
compressor. The normal ow direction of TGE is determined by the primary function, i.e. cooling or heating
This product is approved for R290, R32, R452B, R454B by ignition source assessment in accordance to standard EN
ISO80079-36 .
Capacity table
Table 5: Rated capacity2)
2
) The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
3
) Contact Danfoss for more information
4
) New sales code numbers are on request.
Valve selection based on capacity calculation
As for extended capacity calculations and valve selection based on capacities and refrigerants, please refer to
Coolselector®2. Rated and extended capacities are calculated with the Coolselector®2 calculation engine to ARI
standards with the ASEREP equations based on laboratory measurements of selected valves.
Table 8: R410A/R32,Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 9: R410A, Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 10: R410A,Range K -25 – 10 °C /-15 – 50 °F with MOP 15 °C / 60 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 11: R410A, Range MAH -30 – 15 °C / -22 – 60 °F with anti hunting charge, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 12: R22/R407C 1), Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F"
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
1
) For R407C plants, please select valves from the dedicated R407C program.
Table 13: R22/R407C 1 ), Range K –25 – 10 °C / –15 – 50 °F with MOP 15 °C / 60 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl 37 °C / 98 °F
1
) For R407C plants, please select valves from the dedicated R407C program.
Table 14: R22/R407C 1), Range MAH -30 – 15 °C / -22 – 60 °F with anti hunting charge, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl 37 °C / 98 °F
1
) For R407C plants, please select valves from the dedicated R407C program.
Table 15: R134a, Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl 37 °C / 98 °F
Table 16: R134a, Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 17: R134a, Range K -25 – 10 °C /-15 – 50 °F with MOP 15 °C / 60 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 18: R134a, Range K –25 – 10 °C / –15 – 50 °F with MOP 15 °C / 60°F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 20: R407F/R407A1), Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
1
) On systems charged with R407F, SS = 4.0 °C / 7.2 °F, on systems charged with R407A, SS = 2.7 °C / 4.9 °F.
Table 21: R404A/R507, Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 22: R407C, Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 23: R407C, Range N -40 – 10 °C / -40 –50 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
Table 24: R407C, Range K –25 – 10 °C / –15 – 50 °F with MOP 15 °C / 60 °F, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl: 37 °C / 98 °F
Table 25: R2901), Range N -40 – 10 °C / -40 – 50 °F, OS = 4 K / 7.2 °F
Table 26: R2901), Range K –25 – 10 °C / –15 – 50 °F without MOP, OS = 4 K / 7.2 °F
The rated capacity is based on:
Evaporating temperature te : 4.4 °C / 40 °F
Condensing temperature tc : 38 °C / 100 °F
Refrigerant temperature ahead of valve tl : 37 °C / 98 °F
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some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
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