Refrigeration valves install into suction, discharge, and liquid lines to control the flow of refrigerant in air conditioning and refrigeration systems. Refrigeration valves are ideal for slowing or stopping flow when making repairs and evacuating or recharging refrigerant. Line piercing valves and access valves allow entry to lines. Check valves prevent backflow. Ball valves and shutoff valves turn flow on and off. Capillary tubing regulates flow within lines.