Siemens claims its new MVL702 magnetic expansion valve is set to redefine refrigeration cycle processes in heat pump and chiller applications.
Taking just 1sec to transition from closed to 100% open it is claimed to be the fastest valve on the market.
In addition to its speed, Siemens claims its precision and true position feedback ensure higher system stability and extra energy efficiency.
The MVL702 closes mechanically in case of power failure or cable disconnection, providing extra safety and eliminating the need for additional solenoid valves or super-cap batteries. This reduces the risk of compressor damage and results in simplified equipment design and lower equipment costs.
In addition, its A3 certification qualifies the MVL702 for use with hydrocarbon refrigerants.
A linear magnetic actuator drives the valve directly so there is no friction or mechanical play and no need for lubrication.
In tests with Refra, the Lithuanian manufacturer of chiller, heat pump, and refrigeration equipment, the new magnetic expansion valve boosted the COP during heating by 8.3%.
The magnetically actuated valve achieved this result through a combination of rapid response and highly accurate positioning compared to a traditional stepper motor driven electronic expansion valve. These features allow the control system to run the circuit so that refrigerant leaving the evaporator has the lowest possible superheat.
Ultimately, the increase in COP could potentially allow a heat pump to deliver up to 21% more heat while using 14% less energy, Siemens says.
