Parker’s CK4 check valves are designed to be close coupled to a control valve which will reduce overall installation length, complexity, and cost. These valves are designed to prevent backflow in a variety of refrigeration applications and can be mounted on a valve or as a standalone component. The CK4 can be mounted in any orientation when used as a standalone part of the refrigeration system. These compact valves are spring closing with a lapped, stainless steel or chrome plated seat for positive closing action and low leakage. A minimum pressure difference of 0.05 bar (0.75 psi) is required to hold the valve in the open position. Removable seat plate with combination O-ring and metal to metal knife edge seal allows the valve to be disassembled for maintenance. They may be ordered with male adapter rings for close-coupling to other Refrigerating Specialties valves.Markets:• Industrial Refrigeration• Commercial RefrigerationFeatures and Benefits:• UL Listed (Thru 3” Size)• May be installed in any position• Compact• Lightweight• Inline• Design Pressure (MRP): 34.5 bar (500 psi)Applications:• Re-circulating (overfeed) systems• High speed compressor discharge• Pump discharge• Suction temperatures down to -45°C (-50°F)• Hot gas lines (pan to evaporator)• Not suitable for discharge of reciprocating compressor or economizer port of screw compressor