Installation
The check valves can be installed in any section of a refrigerating system to prevent reverse flow, adhering to the limits and capacities specified in Table 3. Before installation, ensure the system is clean, as PTFE gaskets are sensitive to debris. The flow direction should match the arrow on the valve body. The valves can be installed in various positions depending on the type, with specific orientations recommended for each.

Applications
These check valves are classified as "Pressure accessories" under the Pressure Equipment Directive 97/23/EC. They are suitable for commercial refrigeration systems and civil and industrial conditioning plants using Group II refrigerant fluids. For high-temperature applications, such as near compressors, special gasket-equipped valves (types 3122, 3142, and 3182) are available.

Materials
The valves are constructed from hot forged brass for the body and cover, copper for solder connections, austenitic stainless steel for the spring, chloroprene rubber for outlet seals, and PTFE for seat gaskets.

Functional Characteristics
Table 1 outlines the functional characteristics of the check valves, including PS, TS, Kv factor, and minimum opening pressure differential. These parameters are crucial for ensuring the valve operates correctly under specified conditions.

Refrigerant Flow Capacity
Table 3 provides detailed refrigerant flow capacities for various valve models under specific operating conditions, including evaporating and condensing temperatures, and pressure drops. This information is essential for selecting the appropriate valve for a given application.

Dimensions and Weights
Table 2 lists the dimensions and weights of different valve models, which are important for installation planning and system design.