600AK-series Phillips Check Valves (In-Line Disc Type)

The 600 Series flanged, in-line disc-type, check valves are spring closing with a light spring. They may be installed in vertical or horizontal runs. There is a removable back plate that allows the valve to be easily disassembled for maintenance. The 600D has a metal-to-metal seat. The 600D2 and 600D3 check valves incorporate the Durabla check valve unit. The 600D Series and 'S' suffix valves require about 2 psi pressure drop to open. The 600J and 600K Series valves are Teflon seated valves. When ordered without the 'S' suffix, they are supplied with a light spring with a 1/4 psi cracking pressure, making them suitable for gravity drain lines. The 600 Series check valves prevent reverse flow of refrigerant in suction, hot gas, and liquid lines.

These valves are suitable for liquid refrigerant gravity drain applications, pump discharge, and suction. When used for gravity drain, they should be mounted vertically. These valves are designed for a 300 psi maximum working pressure. When used in hot gas defrost applications, they are installed between the drain pan and the hot gas inlet to the evaporator. In this manner, the valve prevents liquid from collecting in the drain pan coil during normal evaporator operation. The 600 Series check valves are not particularly suitable for reciprocating compressor discharge applications and where flow pulsation sets up a harmonious frequency to that of the valve.