Stable operate under low pressure difference, and it has low pressure dropping and internal leakage Excellent sealing, high energy efficiency, light weight, good vibrations resistance It is used in heat pumps type systems such as central, unit and room air conditioners to convert the refrigeration systems and the heating systems by switching the flows way of More energy-saving, low temperature rise, low and good anti-vibrations The electromagnetic coil is make of thermosetting, water resistance, and excellent insulation