In a needle valve (1) for a high-pressure gas conduit system consisting of two units (2, 3) which are joined and one of which encloses a stepping motor (8) and the other includes gas flow passages and a gas flow control bore (17), a valve needle (10) is supported in the housing unit so as to be mova
In a needle valve (1) for a high-pressure gas conduit system consisting of two units (2, 3) which are joined and one of which encloses a stepping motor (8) and the other includes gas flow passages and a gas flow control bore (17), a valve needle (10) is supported in the housing unit so as to be movable by the stepping motor and extends into the gas flow control bore (17) in the other housing unit through a guide passage (18) provided with seals to prevent gas from flowing to the housing unit including the stepping motor (8) between a region of the guide bore (18) and a low pressure region of the needle valve (1) a compensation connection is provided for relief of pressure at the sealing region ( 43) of the guide bore (18). The needle valve is particularly suitable as an expansion valve in an automotive CO2 air conditioning system.
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What is claimed is: 1. A needle valve for a high-pressure gas conduit system, including a motor housing (7), a valve housing (4) having connection bores (13, 14) for receiving pipe portions ( 5,6) of the gas conduit system, a valve bore (17) extending between the connection bores (13, 14) and a gui
What is claimed is: 1. A needle valve for a high-pressure gas conduit system, including a motor housing (7), a valve housing (4) having connection bores (13, 14) for receiving pipe portions ( 5,6) of the gas conduit system, a valve bore (17) extending between the connection bores (13, 14) and a guide bore (18, 32) coaxially formed in said valve housing ( 4) with said valve bore (17), a valve needle (10) with a cylindrical needle shaft part supported in said motor housing (7) and extending into said valve bore (17) in said valve housing ( 4) and connected to a stepping-motor drive (8, 9) disposed in said motor housing (7), and sealing means (19, 20, 23, 24) extending around said needle in the area of said guide bore (18, 32) for preventing gas from flowing along said cylindrical needle shaft part to said motor housing (7), said motor housing (7) being sealed to said valve housing ( 4), and a compensation connection (42) extending between a region (41) of said guide bore (18) surrounding the valve needle (10) and a low pressure region (43) of the needle valve (1) for the relief of pressure at the sealing region of the guide bore (18), the region (41) being arranged between the at least one sealing means (23-26) and the adjacent valve conduit (15). 2. A needle valve according to claim 1, wherein said connection bores (13, 14) extend coaxially and are blind-hole bores for receiving the pipe portions at opposite sides of the valve housing (4), said connection bores ( 13, 14) being extended via axially parallel mutually spaced extension bores (15, 16) of smaller diameter, and said valve bore (17) extending through a wall between said extension bores (15, 16). 3. A needle valve according to claim 2, wherein said coaxial connecting bores (13, 14) form a spigot socket for the engagement of a coupling spigot of a releasable pipe coupling, said coupling spigot including sealing means. 4. A needle valve according to claim 3, wherein at least one bore (34, 35) for the engagement of fastening means of a side flange of a pipe coupling is provided in the valve housing parallel to the respective spigot socket. 5. A needle valve according to claim 1, wherein the valve housing (4) is formed from an extrusion-molded body having a cross-section which widens from a narrow region adjacent the connecting bores (13, 14) in the direction toward a flange surface (31 ) when the valve housing is connected to the housing (7) of the stepping motor (8). 6. A needle valve according claim 1, wherein the motor housing (7) is connected releasably to the valve housing (4) 30 that the housings form a mounting unit (2, 3), of which the valve housing includes pipe portions (5, 6) of the gas conduit system and the motor housing (7) includes electrical leads and the stepping motor ( 8), and the valve needle (10) is supported by the motor housing and is engaged with the drive mechanism of the stepping motor. 7. A needle valve according to claim 1, for an air-conditioning system operated with carbon dioxide, wherein the guide bore (18) serving for sealing contact with the valve needle (10) has at least approximately the same diameter as the valve bore (17) . 8. A needle valve according to claim 2, wherein said sealing means is at least one O-ring (19, 20; 25, 26). 9. A needle valve according to claim 8, wherein the at least one O-ring (19, 20) is held in a groove (21, 22) surrounding the valve needle ( 10). 10. A needle valve according to claim 8, wherein the valve needle (10) is surrounded by two sealing rings (19, 20; 25, 26). 11. A needle valve according to claim 1, wherein, with the valve opened to the maximum, the front end ( 36) of the valve needle (10) is at a distance from the valve bore (17), so that the flow cross section of the latter is completely open. 12. A needle valve according to claim 2, wherein a bypass passage (37) of smaller cross-section is provided parallel to the valve bore (17). 13. A needle valve according to claim 1, wherein the compensating connection (42) emanates from a peripheral groove ( 40) provided in the valve needle (10). 14. A needle valve according to claim 1, wherein the compensating connection extends to the low-pressure region (16) of the needle valve (1) via a transverse bore and a central bore ( 39) of the valve needle (10'). 15. A needle valve according to claim 1, wherein said bypass passage (37) extends between said extension bore (16) located on the low-pressure side into a bottom space (38) of the connecting bore (14) located on the high-pressure side. 16. A needle valve according to claim 1, wherein the motor housing (7) includes an electrical energy storage device and control electronics for providing emergency power in the event of an interruption in a main power supply to the stepping motor (8) for the purpose of closing the needle valve ( 1).
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Worden Donald A. (Pompton Plains NJ), Automatic pressure control system.
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