Structure, function, assembly and use of 4-way reversing valves
Danfoss GmbH Kältetechnik
4-Way Reversing valves
The 4-way valves are used in reversible
applications such as heat pumps or reversible
air conditioning units and chillers.
4-Way Reversing valves Type STF and STF-H
The cycle inversion is initiated by a small solenoid pilot valve, which pilots the movement of a slider, which changes the direction of the refrigerant. The valve is connected to the discharge and suction pipes. The pilot valve ensures a very reliable changeover from cooling to heating mode, the changeover happens instantaneously with a minimum pressure differential. The valve design also guarantees a minimum pressure drop and a very low risk of leakage.
Special safety note for ammable refrigerants! For countries where safety standards are not an indispensable part of the safety system Danfoss recommends the installer gets a third party approval of any system containing flammable refrigerant Please refer to separate drawings of the STF and STF-H valves with special disclaimer regarding usage of flammable refrigerants. Please refer to separate document “Important Notice for usage of STF and STF-H valves with flammable refrigerants (No. S-FD001-3).
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The 4-way valves are used in reversible
applications such as heat pumps or reversible
air conditioning units and chillers.
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