초록 ▼

A gas regulating valve includes a valve housing. A tubular valve member is received in the valve housing, defines a valve space, and is formed with a valve seat. The valve seat defines a valve opening, and divides the valve space into a gas feed portion and a gas supply portion. A valve stem is prov

A gas regulating valve includes a valve housing. A tubular valve member is received in the valve housing, defines a valve space, and is formed with a valve seat. The valve seat defines a valve opening, and divides the valve space into a gas feed portion and a gas supply portion. A valve stem is provided with a valve piece that extends into and that is axially movable relative to the valve member. Rotation of the valve stem results in corresponding rotation of the valve member and further results in translation of the valve piece. Translation of the valve piece toward and away from the valve opening enables the valve piece to respectively reduce and increase amount of gas flowing from the gas feed portion into the gas supply portion through the valve opening.

대표청구항 ▼

1. A gas regulating valve comprising:a valve housing confining an interior space and formed with a stem opening for access into said interior space, said stem opening having an axis, said interior space having a stem mounting portion and a valve mounting portion respectively disposed proximate to an

1. A gas regulating valve comprising:a valve housing confining an interior space and formed with a stem opening for access into said interior space, said stem opening having an axis, said interior space having a stem mounting portion and a valve mounting portion respectively disposed proximate to and distal from said stem opening along said axis, said valve mounting portion being confined by an inner wall surface that surrounds said axis, said inner wall surface being formed with a radially disposed gas inlet bore that is adapted to be connected to a gas source; a tubular valve member received in said valve mounting portion of said interior space and rotatable about said axis, said valve member having an outer valve surface in sliding contact with said inner wall surface of said valve mounting portion and an inner valve surface that surrounds said axis and that defines a valve space, said inner valve surface being formed with a radial inward annular valve seat that defines a valve opening registered with said axis, said valve seat dividing said valve space into a gas feed portion and a gas supply portion respectively disposed proximate to and distal from said stem opening along said axis, said gas supply portion being adapted to be disposed in fluid communication with a gas consuming device, said valve member being provided with a gas feed orifice that is formed through said inner and outer valve surfaces and that is in fluid communication with said gas feed portion, said outer valve surface being formed with a gas feed channel to fluidly communicate said gas feed orifice with said gas inlet bore when said valve member is rotated about said axis to register said gas feed channel with said gas inlet bore; and a valve stem having an operating stem portion disposed outwardly of said valve housing, and a valve coupling portion extending along said axis from said operating stem portion into said stem mounting portion through said stem opening, said valve coupling portion being provided with a frusto conical valve piece distal from said operating stem portion, said valve piece extending along said axis into said gas feed portion of said valve member and having a smallest cross-section smaller than said valve opening in said valve seat, said valve coupling portion being coupled co-rotatably to said valve member and being movable along said axis relative to said valve member, said valve coupling portion being further coupled rotatably to said valve housing such that rotation of said operating stem portion about said axis results in corresponding rotation of said valve member and further results in translation of said valve piece along said axis in said gas feed portion of said valve member, translation of said valve piece toward said valve opening enabling said valve piece to reduce amount of gas flowing from said gas feed portion into said gas supply portion through said valve opening, translation of said valve piece away from said valve opening enabling said valve piece to increase the amount of gas flowing from said gas feed portion into said gas supply portion through said valve opening. 2. The gas regulating valve as claimed in claim 1, wherein said valve piece further has a largest cross-section larger than said valve opening.3. The gas regulating valve as claimed in claim 2, wherein said valve piece is formed with a gas passageway that extends along said axis and that permits fluid communication between said gas feed portion and said gas supply portion through said gas passageway.4. The gas regulating valve as claimed in claim 3, wherein said valve member is further provided with a radial aperture that is formed through said inner and outer valve surfaces, that is in fluid communication with said gas supply portion, and that is angularly spaced apart from said gas feed channel, said radial aperture fluidly communicating said gas supply portion with said gas inlet bore when said valve member is rotated about said axis to register said radial aperture with said gas inlet bore.5. The gas regulating valve as claimed in claim 4, wherein said valve housing is formed with a cam edge around said valve coupling portion, and said valve coupling portion is provided with a radial follower pin that abuts against and that is slidable along said cam edge, said cam edge controlling extent of translation of said valve piece along said axis when said valve stem is rotated about said axis.6. The gas regulating valve as claimed in claim 5, wherein said gas feed channel includes a circumferentially extending section to be registered with said gas inlet bore and having opposite ends angularly spaced apart from said radial aperture, and an axially extending section extending from said circumferentially extending section to said gas feed orifice.7. The gas regulating valve as claimed in claim 6, wherein said cam edge hasa first stop corresponding to an initial angular position of said valve member where neither said radial aperture nor said circumferentially extending section of said gas feed channel is registered with said gas inlet bore, a first flat section extending from said first stop, said valve stem being axially movable relative to said valve housing and being rotatable about said axis to cause said follower pin to move past said first stop and to abut against said first flat section when said valve member is rotated from the initial angular position to a maximum flow position where said radial aperture is registered with said gas inlet bore, wherein sliding movement of said follower pin along said first flat section due to rotation of said valve stem about said axis does not result in axial translation movement of said valve piece, an inclined section extending from said first flat section, said follower pin abutting against said inclined section when said valve member is rotated from the maximum flow position to a regulating flow position where said circumferentially extending section of said gas feed channel is registered with said gas inlet bore, and gas flows through said gas passageway in said valve piece, wherein sliding movement of said follower pin along said inclined section due to rotation of said valve member from the maximum flow position to the regulating flow position results in axial translation movement of said valve piece toward said valve opening in said valve seat until said valve piece blocks said valve opening, a second flat section extending from said inclined section, said follower pin abutting against said second flat section when said valve member is rotated from the regulating flow position to a minimum flow position where said circumferentially extending section of said gas feed channel is registered with said gas inlet bore, said valve piece blocks said valve opening in said valve seat, and gas flows through said gas passageway in said valve piece, wherein sliding movement of said follower pin along said second flat section due to rotation of said valve stem about said axis does not result in axial translation movement of said valve piece, and a second stop disposed at one end of said second flat section opposite to said inclined section to arrest further rotation of said valve stem in a direction away from said inclined section. 8. The gas regulating valve as claimed in claim 5, further comprising a biasing spring for biasing said valve stem to ensure abutment of said follower pin against said cam edge.9. The gas regulating valve as claimed in claim 5, wherein said valve housing includes a main body formed with said valve mounting portion, and a valve cap mounted on said main body and formed with said stem opening and said stem mounting portion, said cam edge being formed on said valve cap.10. The gas regulating valve as claimed in claim 1, wherein said valve piece is coupled threadedly to said valve coupling portion.11. The gas regulating valve as claimed in claim 1, wherein said valve housing is formed with a cam edge around said valve coupling portion, and said valve coupling portion is provided with a radial follower pin that abuts against and that is slidable along said cam edge, said cam edge controlling extent of translation of said valve piece along said axis when said valve stem is rotated about said axis.12. The gas regulating valve as claimed in claim 11, wherein said valve housing includes a main body formed with said valve mounting portion, and a valve cap mounted on said main body and formed with said stem opening and said stem mounting portion, said cam edge being formed on said valve cap.13. The gas regulating valve as claimed in claim 11, further comprising a biasing spring for biasing said valve stem to ensure abutment of said follower pin against said cam edge.14. The gas regulating valve as claimed in claim 11, wherein said valve member is formed with an axially extending notch to receive said follower pin, thereby coupling co-rotatably said valve coupling portion to said valve member while permitting movement of said valve coupling portion along said axis relative to said valve member.15. The gas regulating valve as claimed in claim 1, wherein:said inner wall surface is further formed with a radially disposed gas outlet bore that is adapted to be connected to the gas consuming device; said valve member having an open end that permits fluid communication between said gas supply portion and said gas outlet bore.