4-Way Reversing Valve Pressure Drops and Dimensioning
Pressure drops are of fundamental importance for valve dimensioning. Excessively large pressure drops usually have a negative e ect on the energy efficiency of a refrigeration system, while excessively small pressure drops can have undesirable e ects, such as disturbing the stable operation of a servo solenoid valve. Both of these aspects can be regarded as less critical with 4-Way Reversing Valve.
A very low pressure drop on the pressure or suction side is not a problem with a 4-Way Reversing Valve because the slider mechanism that controls the valve position is actuated by the pressure di erence between the high- pressure and low-pressure lines of the refrigeration system.
This is possible because both pressures are directly available with this type of valve, which is generally not the case with other types of valves used in conventional dry-expansion refrigeration systems. As a result, the actual pressure drop across the valve, such as between the refrigerant inlet and outlet of the suction line, is not critical for the operational reliability of the valve. Excessive pressure drops are also not a signi cant issue with Danfoss Saginomiya 4-Way Reversing Valve if, from a design perspective, dimensions are based on the size of the suction line.
If you select a 4-Way Reversing Valve based on this tube diameter, in the vast majority of cases you will have a valve with a very moderate pressure drop. Of course, it is safer to consult the relevant capacity tables to check that the selected valve is su ciently large. However, in most cases this check is not really necessary.