Valves for hermetic unit VHU PLUS series

The hermetic group valves are classified as “Pressure accessories” in the sense of the PED Directive 2014/68/EU, Article 2, paragraph 5 and are subject to Article 4, paragraph 1, letter (c), of the same Directive.

All the product range is suitable for use with fluids proper to Group 1 and 2, as defined in Article 13, paragraph 1, letter (a) and letter (b), of PED Directive 2014/68/EU with reference to the Regulation (EC) n. 1272/2008, according to safety classification A1, A2L in Annex E of the standard EN 378-1:2016. Examples of refrigerants fluids are:

– HFC R32, R134a, R404A, R407C, R410A, R507;

– HFO R1234yf, R1234ze and blends HFC/HFO R448A, R449A, R450A, R452A, R452B, R445A, R454B, R454C, R513A.

It is also possible to use these PLUS series products with HC hydrocarbon refrigerants such as:

– R290, R600, R600a, R1270;

proper to Group 1, as defined by Article 13, paragraph 1, letter (a) of PED Directive 2014/68/EU, with reference to Regulation (EC) n. 1272/2008 and according to safety classification A3, in Annex E of the EN 378-1:2016 standard. This valve series is particularly suitable for systems using hermetic compressors.


The body is made of hot forged brass EN 12420 – CW617N and the spindle is made of galvanized steel. A package consisting of elastomer seals and aramid fibers gaskets, approved by DIN-DVGW in accordance with DIN 3535, part 6 FA, guarantees the seal towards the outside in an area not directly in contact with the fluid, between the spindle and the gland.


For the VHU..S series the brazing to the system shall be done with a low melting point alloy. During this process do not point the flame directly towards the body in order to save the gaskets.