CONTROL VALVE DESIGNED TO CONTROL THE FLOW OF A GAS ACCORDING TO ITS PRESSURE

摘要

The invention relates to a control valve designed to control the flow of a pressurized gas based on a comparison between the actual pressure of a gas reaching the valve and a reference pressure. Within a housing (1) the control valve comprises a valve body (25) with a calibrated orifice (27). A tight bellows (38) contains a control gas and has an elastic rigidity determining the reference pressure and maintaining the valve body (25) on a valve seat (15) as long as the actual pressure of the pressurized gas GPG is lower than the reference pressure, in order to force the pressurized gas GPG to flow through a calibrated orifice (27) and allows said valve body (25) to move away from the tight seat (15) when the actual pressure is at least equal to the reference pressure, in order to release the flow of pressurized gas GPG. The valve is applicable in particular to the control of a liquefied petroleum gas vaporizer.