The gas ballast is designed to retard the process of water vapor condensing within the vacuum pump. The gas ballast is a valve arrangement which, when opened, will allow relatively dry atmospheric air ...

OVERCHARGED TUBE: Refrigerant overcharging is a common issue that occurs when installing heat pumps. (Courtesy of Empire Heating & Air Conditioning ... expansion valves]. Also, it's best to flow ...

When we last spoke to the people at Microstaq Inc., maker of the silicon Ventillum microelectromechanical systems (MEMS) expansion valve ... virtually all air-conditioning, heat-pump, and ...