hi dear sirs,
i have anew stranger problem in acold store room,this room working with danfous valve station, the problem start from about 2 weeks,the room temperature increases to -2 or -4C, i checked the valve station and i found that the main suction valve
(danfous PM1-65) have aproblem with opening but the solenoid valve working good, now i working with manual valve (sevice valve) and i canceled the danfous valve effect, now i need to check danfous valve but i cant because there is no service valve before the danfous valve