Danfoss TEAT 20, TEAT 85 Data sheet

Data Sheet

Desuperheating valve

Type TEAT

Used to inject refrigerant into the suction line of the refrigeration system

Refrigerant injection into the suction line

TEAT valves are used to inject refrigerant into the suction line of the refrigeration system to reduce the high discharge temperatures that can occur when the system operates with highly superheated suction vapour.

This applies when, for example:

• A compressor runs either with low suction pressure or with high condensing temperature

• A compressor runs with both low suction pressure and high condensing temperature. This applies especially to systems with R 22

• A compressor receives highly superheated suction vapour

• A compressor runs with capacity regulation by hot gas bypass

Two-stage refrigeration plant

TEAT valves are also used in two-stage refrigeration plant to control liquid injection into the intercooler. The bulb is installed on the discharge line from the highpressure compressor. The theoretically obtainable discharge temperature for given operating conditions can be found in the h, log p diagram for the refrigerant concerned.

Temperature regulation of the medium

TEAT valves have a further application: the temperature regulation of the medium, e.g. the temperature of the oil in a screw compressor.

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Desuperheating valve, Type TEAT

Features

•Refrigerants Applicable to HCFC, non flammable HFC and R717 (Ammonia)

•Regulation ranges: See ordering table

•Classification: DNV, CRN, BV, EAC etc. To get an updated list of certification on the products please contact your local Danfoss Sales Company

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Desuperheating valve, Type TEAT

Functions

Figure 1: TEAT

Temperature variations in the discharge pipe where the bulb is placed act on the thermal charge in the bulb (12). This changes the pressure in the thermostatic element (1) and thus gives modulating liquid injection.

If leakage in the thermostatic element does occur, it will not result in refrigerant loss.

The thermostatic element is screwed to the intermediate section (11) of the valve. A bellow on the intermediate section means that the suction pressure cannot influence the valve setting.

The movement of the setting spindle (4) is transferred through a gearwheel mechanism.

The orifice assembly (2) is identical to that of TEA thermostatic expansion valves.

NOTE:

The TEAT is not able to close completely tight, so a solenoid valve is needed to shut o„ liquid supply, when the system stops.

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