Charging mechanisms

Internal mechanisms for access valves

Primary material: Drawn brass EN 12164 and Stainless steel for metal parts, Hydrogenated Nitrile Butadiene HNBR, Chloroprene CR (Neoprene&copy) and PTFE (Teflon©) for soft sealings

Standard and regulation reference: PED 97/23/CE, RoHS 2002/95/CE, REACH Reg. 1907/2006, EN378-2:2008

Application: Suitable for air-conditioners and refrigerating systems that work with refrigerant proper to the group II Article 9, 2.2 of the PED Directive 97/23/CE, referring to the Directive 67/548/CEE. ( tested with the following: R12, R22, R134a, R404A, R407C, R410A, R502, R507, CO2 R744, R32 ). Not suitable for Ammonia R717

Recommended fitting condition:
Remove the mechanism before brazing to avoid over-heating

Risk category according to Pressure Equipment Directive PED 97/23/CE: Article 3 Paragraph 3

Picture Part number Temperature range
Tightening torque (Nm)
MC-02 MC-02 min -40
MAX +100
(Peak +130)
Static: 140bar
Operating: 60bar
min 0,4
MAX 0,5
MC-04 MC-04 min -40
MAX +150
Static: 140bar
Operating: 60bar
min 0,4
MAX 0,5
MC-05 MC-05 min -40
MAX +100
(Peak +130)
Static: 40bar
Operating: 28bar
min 0,4
MAX 0,5
MC-06 MC-06 min -35
MAX +100
(Peak +125)
Static: 40bar
Operating: 28bar
min 0,30
MAX 0,35

Operating pressure is the maximum pressure under which the core plunger can be operated without being deteriorated during the opening-closing movement.
Static pressure is the maximum pressure under which the machanism can safely operate in the closed position during its service life. It may be called also Service pressure or Working pressure.


MC internal schrader mechanisms for access valves
Internal mechanisms can be supplied assembled on valves and access fittings (Tee, Cross, Straight) upon request.
Other mechanisms suitable for specific applications are not listed, but available at stock: our technical dept. can advice which is the best mechanism for your application. Internal mechanisms specific for Carbon dioxide CO2 R744 are available: part number MC-02 and MC-04.


Compatible Refrigerants
Part number R11 R12 R22 R123 R134a R404A R407C R477 (CO2) R410A R507
MC-02 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
MC-04  No   No   No   No  Yes Yes Yes Yes Yes Yes
MC-05 Yes Yes Yes Yes Yes Yes Yes N/A Yes Yes
MC-06 Yes Yes Yes Yes Yes Yes Yes N/A Yes Yes

CFCs (chlorofluorocarbons) and HCFCs (hydrochlorfluorocarbons) are generally miscible with the traditional lubricants and so oil return has not been a problem in systems using these unique chemicals.
As is now well known, HFCs are not fully miscible with mineral and alkylbenzene lubricants and have been developed new synthetic oils, which can cause severe problems if the chemical compatibility with materials of sealing gaskets is not properly checked.

Compatible Lubricants
Part number PAG POE MO
MC-02                    Yes                                       Yes                                       Yes                   
MC-04                    Yes                                       Yes                                       Yes                   
MC-05                    Yes                                       Yes                                       Yes                   
MC-06                    Yes                                       Yes                                       Yes                   

Typical applications

MC-02 is the latest design, highly recommanded for all the most typical applications due to its quality/price ratio.

MC-04 is recommanded for automotive A/C (due to its chemical resistance to fluids commonly used in cars) and for appications where high-temperature resistance is a key factor.

MC-05 and MC-06 are the cheapest and the most commonly used mechanisms for a number of applications in commercial refrigeration and air-conditioning:
MC-05 has an external spring offering the advantage to let the valve reach the 90% of the flow with just the 10% of the stroke of the pin during the opening operation;
MC-06 has an internal spring offering the advantage to be more protected, especially from inexpert personnel.