Control Valves for Liquid Chromatography
A high-performance liquid chromatography and control valve technology, applied in the field of high-pressure control valves, can solve the problems of changing pressure conditions and the difficulty of jointing the axial mobility of the drive shaft, etc., and achieve the effects of simple cost, compact configuration, and low-cost manufacturing
Active Publication Date: 2017-03-01
DIONEX SOFTRON
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
The axial displaceability of this drive shaft makes engagement of the driven end of the drive difficult if the valve is not manually switch-operated but controlled switch-operated
There is the risk that the axial forces generated by the drive are transmitted to the valve drive shaft and thus change the pressure conditions at the contact surface between rotor and stator
[0011] In addition, there is the problem that in HPLC at the high pressures used for the medium to be passed through, in recent years materials have been used for the stator and the rotor, in which the two interacting surfaces consist of hard materials
Method used
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Embodiment Construction
[0079] Such as figure 1 The illustrated control valve 1 comprises a housing 3 which has a first housing part 5 and a second housing part 7 . A drive unit 45 , for example in the form of an electric motor, is accommodated in the pot-shaped second housing part 7 . In the first housing part 5 , the actual control valve is accommodated in the upper region and the transmission unit 37 is accommodated in the lower region, which is engaged with the drive unit 45 . The first housing part 5 is closed with a first cover part 17 and a second cover part 33 .
[0080] The actual control valve includes a stator 29, a rotor 23 and a supporting and pressing device 8, which is used to rotatably support the rotor 23 in the housing 3 and generate a pressing force, by means of which The rotor bears this pressing force in the direction towards the stator. In a known manner, the stator has a port opening cross-section with connection ports 31 formed on the stator end face for the supply or disc...
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The invention relates to a control valve for liquid chromatography, having a stator arranged in a housing and configured with a plurality of connection ports and a rotatable rotor arranged in the housing, the rotor in an angle defined by a corresponding angular position Interacting with the stator at a prescribed operating position to allow fluid to connect or disconnect a predetermined connection port, the rotor is rotatably supported by means of a bearing compression device provided in the housing and can withstand a predetermined compression towards the stator force. The bearing and pressing device has a spring unit which is supported on a receptacle of the bearing and pressing device which is axially biased against the rotor directly or by means of an engagement unit of the bearing and pressing device. The position is constant and can be rotatably supported around the rotor axis by means of bearings, and the receiving part is connected with the rotor or the joint unit in a rotationally fixed manner and has a drive part away from the stator, which can be connected with the slave of the drive device moving end or connected to the operating piece.
Description
technical field [0001] The present invention relates to control valves for liquid chromatography and in particular high pressure control valves for high performance liquid chromatography (HPLC). Background technique [0002] In HPLC, high-pressure control valves are used to perform a whole range of different tasks, such as to remove the sample to be tested from the sample container, supply it into the sample loop and from the sample loop into the high-pressure fluid flow to the chromatographic column. flow, or to flush different components or switch between multiple columns. [0003] This control valve is generally used in HPLC autosamplers, column furnaces or fractionation collectors. [0004] When using control valves, it is basically always advantageous if the capillary path between the relevant components, ie the length of the capillary leading the medium to be treated, is short. For example, when conducting a sample in an eluent flow, it is always advantageous to simp...
Claims
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IPC IPC(8): F16K11/074
CPCF16K11/0743F16K31/043G01N30/26G01N2030/202F16K25/00F16K37/0033F16K2200/101
Inventor H·霍赫格贝尔B·赛弗思R·史宾格
Owner DIONEX SOFTRON