Regulator for corrosive gas tapping in under-atmospheric conditions

摘要

The invention relates to a device for regulating a pressurized gas, said device including: a stopper (4) engaging with a seat (5) and capable of closing a pressurized gas passage; a so-called low-pressure chamber (29) downstream from the seat (5), the low-pressure chamber including a plate (27) to which the stopper (4) is coupled, and the plate being subjected to the force of a spring (30) housed in said chamber (29) and arranged concentrically relative to the seat (5) and the fastening means (28) thereof. The chamber (29) is defined by a diaphragm (26) in free contact with the plate (27). The opposite surface of the diaphragm (26) is subjected to the force of a spring (20) having a prestress which is adjustable via control means (13, 14). The control means are indexed according to two positions: a first prestress release position for ensuring the closure of the device at the stopper (4), and a second calibrated prestress position of the diaphragm (26) corresponding to the regulator operational position. A sealed chamber (24) defined by the surface of the membrane (26) opposite the low-pressure chamber (29) 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.

主权项

1. Device for regulating pressurized gas comprising
a body with a passage adapted to be connected to a pressurized gas; a stopper, movable in translation along an axis and adapted to cooperate in a leakproof manner with a seat provided in the passage; a movement of the stopper in the flow direction of the fluid corresponding to a movement for closing the passage; the stopper comprising an elongated threaded portion extending downstream of the seat; a plate comprising a threaded through hole which the threaded portion of the stopper engages; a blocking counter-screw in the threaded through-hole of the plate; first elastic means exerting a force on the plate and the stopper in the direction for closing the passage; a low-pressure chamber downstream of the seat and of the stopper, the low-pressure chamber being defined by a cavity formed in the body and by a membrane fixed to the body and freely contacting the plate, the membrane being able to move as a function of the pressure in said chamber and to control the stopper, thus making it possible to regulate in said chamber the flow rate and/or pressure of the pressurized gas; the first elastic means being housed in the low-pressure chamber; wherein the first elastic means is supported at a bottom surface of the cavity of the body defining the low-pressure chamber; and wherein the bottom surface of the cavity of the body defining the low-pressure chamber surrounds the seat and is at a level of the seat or at a lower level that is upstream of the seat; and wherein the bottom surface of the cavity of the body defining the low-pressure chamber forms a circular recess housing the first elastic means.