Components for refrigeration and air conditioning

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Products for R744
The majority of refrigerants in use today are substances obtained by chemical synthesis, with high refrigeration performance. Unfortunately big part of them have negative environmental effects, with a high potential for atmospheric ozone destruction (ODP, Ozone Depletion Potential) or directly contribute to the greenhouse effect (have high GWP, Global Warming Potential).
That’s why many countries have already taken steps to prevent or limit the use of synthetic type CFC and HCFC refrigerants and are deciding about HFC in favor of refrigerants with low or zero ODP and GWP.
Among the latter we find the carbon dioxide (CO2) called R744 in the refrigeration, that despite being less e cient than a synthetic refrigerant, is a natural fluid with ODP=0 and GWP=1.
R744 is classified in Article 13, paragraph 1, letter b, of Directive PED 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.
A particular characteristic of this fluid is the critical point temperatures at 31 °C. This value is so low that in some applications is necessary to recur to transcritical cycles (no condensation phase) that works at higher pressures than those of the classic commercial or industrial plants.
There are three main types of CO2 application:
• Subcritical (cascade systems)
• Transcritical (only CO2 systems)
• Secondary fl uid (CO2 used as a volatile glycol)

All GMC REFRIGERAZIONE products for R744 have been specially studied for such applications. Our components for subcritical cycles are designed for achieving PS up to 62 bar while for transcritical cycles are designed for PS up to 120 bar. The seal is guaranteed by helium tests for the detection of micro leakages according to Method B.6 of Appendix A (specific properties of leakage searching methods) of standard UNI EN 1779:2004.
Replaceable solid core filters CSR..MP series
Replaceable solid core filters CSR..MPI series
Moisture indicators MI..SMP series
Moisture indicators MI..SMPI series
Check valves CV3..MP series
Three way motorized ball valves BVT series
Ball valves BV..K and BV..AK series
Capped valves CSV..SHP series
Capped valves RVV..HP series
Valves for hermetic systems VHU..HP series