Check valves CV3..MP series

The check valves are classified as “Pressure accessories” in the sense of the PED Directive 2014/68/EU, Article 2, paragraph 5 and are subject of Article 4, paragraph 1, letter (c), of the same Directive. All the product range is suitable for use with refrigerant R744 (CO2), classified in Article 13, paragraph 1, letter (b), of PED Directive 2014/68/EU as part of Group 2, therefore not toxic, not inflammable and not explosive fluid and indicated in A1 Group of Annex E of standard EN 378-1.

The function of the check valves is to ensure the unidirectional passage of the fluid through the pipes.


The body and the nipple are made from brass bar UNI EN12164 – CW614N and the solder connections are made of copper tube EN 12735-1 – Cu-DHP. The clapper seat is made of modified PTFE and combines robustness with excellent resistance to high temperatures; the spring that keeps the gate shut is in austenitic stainless steel AISI 302. The seal between the body and nipple is ensured by an HNBR sealing ring.


While installing the valve, make sure the arrow direction matches the flow direction. We recommend installing the valves with the vertical axis and the arrow pointing upwards; installations with the inclined or horizontal longitudinal axis are tolerable. The brazing of the valves with solder connections shall be done with a low melting point alloy. During this process keep the product cooled and do not point the flame directly towards the body; after finishing allow the latter to cool by natural convection in the air.