Relief valve for pressure control of car air-conditioning system has bulb filled with control fluid, and placed in trajectory of air flow for controlling valve as function of pressure of control fluid

摘要

Relief valve (10) has bulb (28) filled with control fluid (FC) and connected by capillary tube (30) with static pressure sensor (24) controlling controllable valve (20). Bulb has electric resistance (34) heating control fluid in controllable conditions, and bulb is placed in trajectory of air flow (AR) across gas cooler of circuit. This allows control of valve as function of pressure of control fluid, which depends especially of these air flow parameters. An Independent claim is also included for the air conditioning system.