Compact and balanced regulator for delivering pressurized fluid

A compensated pressure regulator for use with fluid under pressure comprising:

• a hollow body,
• at least one intake for the fluid under high pressure,
• at least one outlet for this fluid under low pressure from a downstream expansion chamber,
• a mobile regulation piece which slides in a cylindrical bore of the hollow body, and which, forming a piston on which bear on one side the low pressure and on the other side an expansion spring element, is able to stop the intake of the fluid at high pressure, and
• a piece of generally cylindrical form with two heads of which the two partial inner and opposing faces are of quasi-equal surface, and these two partial inner faces, a part of a bore surrounding the piece in a seal-tight manner and a seal integral with this bore delimiting a high-pressure chamber, and the piece with two heads and this bore being mobile in relation to one another,
• wherein the intake for the high-pressure fluid emerges laterally in this high-pressure chamber, which fluid transmits to the mobile regulation piece loads which cancel each other, and the displacement of the mobile regulation piece is therefore not modified by the variations of the high pressure,
• wherein the mobile regulation piece stops the intake of the high-pressure fluid and isolates, in a seal-tight manner, the high-pressure chamber from the downstream expansion chamber by bearing on the tight seal of the head situated on the low-pressure side of the downstream expansion chamber when the pressure therein transmits a force greater than the opposing force imparted by the spring element on the mobile regulation piece,
• wherein reciprocally, this mobile regulation piece opens the intake for the high-pressure fluid from the high-pressure chamber to the expansion chamber when the low pressure therein transmits a force less than the opposing force imparted by the spring element on the mobile regulation piece,
• wherein the piece of generally cylindrical form with two heads is fixed in relation to the hollow body and the mobile regulation piece bears the bore and the seal which slide around the piece of generally cylindrical form with two heads, this mobile regulation piece itself sliding in another bore of the hollow body.