Regulator for corrosive gas tapping in under-atmospheric conditions

Abstract

The invention relates to a device for regulating a pressurized gas, said device including: a stopper () engaging with a seat () and capable of closing a pressurized gas passage; a so-called low-pressure chamber () downstream from the seat (), the low-pressure chamber including a plate () to which the stopper () is coupled, and the plate being subjected to the force of a spring () housed in said chamber () and arranged concentrically relative to the seat () and the fastening means () thereof. The chamber () is defined by a diaphragm () in free contact with the plate (). The opposite surface of the diaphragm () is subjected to the force of a spring () having a prestress which is adjustable via control means (). The control means are indexed according to two positions: a first prestress release position for ensuring the closure of the device at the stopper (), and a second calibrated prestress position of the diaphragm () corresponding to the regulator operational position. A sealed chamber () defined by the surface of the membrane () opposite the low-pressure chamber () is formed by the prestress control means for ensuring the connection to a detector for detecting the presence of a leak or of the used gas in order to detect a potential leak at the diaphragm.