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High-pressure-gas-valve

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High pressure gas valve

Details

Inventors: Davidson, Gilbert;
Assignee:
Primary Examiner: Huson; Gregory L.
Assistant Examiner: Krishnamurthy; Ramesh
Attorney, Agent or Firm: Brant; Kyle S.

A post valve for use with a source of high pressure gas is disclosed. The post valve includes a body having an inlet aperture extending therethrough. The body further includes an outlet aperture in fluid communication with the inlet aperture. A stem having external threads is rotatably inserted into the body aperture and engages mating threads within the body. A fluid seal disposed about the stem prevents fluid flow past the stem. A threaded bonnet is disposed over the stem and mates with another threaded portion within the body. The threads of the stem are of different pitch than the bonnet. The fluid seal is situated so that fluid flowing into the inlet aperture and out the outlet aperture does not contact the threaded portions of the stem or body. The valve further includes a safety vent aperture in fluid communication with the inlet aperture and a high pressure rupture device that vents air pressure through the safety vent when the pressure within the inlet aperture exceeds a predetermined safety threshold pressure. Disposed at the inner end of the stem is a tip seal that provides a fluid flow seal between the inlet and the outlet apertures when the stem is fully rotated into the body. The stem further includes a radially protruding portion that prevents the stem from being rotated and simultaneously removing the bonnet portion from the valve.

DETAILED DESCRIPTION A high pressure valve removably attachable to a high pressure gas cylinder, according to one aspect of the present invention, comprises a body having an inlet aperture, an outlet aperture, and a stem aperture wherein the inlet aperture is in fluid communication with the stem aperture, and wherein the outlet aperture is in fluid communication with the stem aperture, and wherein the body includes a first threaded portion formed in the stem aperture and a second threaded portion formed in the stem aperture and wherein the first and the second threaded portions are coaxially aligned, means for fluidly coupling the inlet aperture of the body to the high pressure gas cylinder, a stem having a cylindrical cross-section and including a handle end and a seal end, the stem further including an external threaded portion formed in the lateral cylindrical surface of the stem and matable with the first threaded portion of the body, the stem also including an annular channel in the lateral cylindrical surface of the stem, the annular channel disposed between the external threaded portion of the cylindrical stem and the seal end of the stem, and wherein the stem is rotatably insertable into the stem aperture of the body so that the external threaded portion of the stem engages the threaded portion of the stem aperture, and wherein the seal end of the stem prevents fluid flow between the inlet aperture and the stem aperture when the stem is fully rotatably inserted into the stem aperture of the body, seal means disposed in the annular channel of the stem for providing a fluid seal between the stem and the stem aperture of the body, and a bonnet having a cylindrical cross-section and a bonnet aperture therethrough, the bonnet including an external threaded portion matable with the second threaded portion of the stem aperture, and wherein the bonnet is disposed over the stem so that the handle end of the stem protrudes through the bonnet aperture and wherein the bonnet is rotatably inserted into the stem aperture with the external threaded portion of the bonnet engaging the second threaded portion of the stem aperture

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