An outdoor air conditioner unit is connected to indoor units by a gaseous refrigerant communication pipe and a liquid refrigerant communication pipe. The outdoor air conditioner unit is provided with a gas-side shut-off valve and a liquid-side shut-off valve. The gas-side shut-off valve has a pipe connecting...http://www.google.de/patents/US7086250?utm_source=gb-gplus-sharePatent US7086250 - Outdoor unit of air conditioner
