CS271794B1 - Multi-way high-pressure valve, e. g. for liquid chromatography - Google Patents

Abstract

The merit of the solution concerns the fact that the valve, which works on the principle of the flat valve, has both mutually sealing plates (1) centred on the outer diameter in the only cylinder carrier hole (2), while at least one sealing plate (1) or the shell, in which it is fixed, has a spherical shape on the centring surface (3) and the mutual down pressure of the sealing plates (1) is realized by a spring (4).<IMAGE>

Description

The invention relates to a multiple high pressure valve, for example for liquid chromatography on the principle of a flat slide formed by two sealing plates.

Multi-way high-pressure valves are used in liquid chromatography as loop feeders and hydraulic column switches. The two most widely used constructions work as flat or conical rotary sliders with one hard (stainless steel) and one straight (mixed polyimide) sealing member. The pressure force ensuring the pressure resistance of the tens of MPa is high hundreds of N. From the point of view of the required control torque, flat gate valves are preferred, where the ejection acts on a smaller diameter.

Since the valves must not have poorly flushed spaces, the two sealed parts with precisely drilled holes must be carefully centered with each other, while the sealing surfaces must be strictly planar. This leads to critical production accuracy requirements for known designs. Failure to observe discontinuities in the hydraulic paths which, in the case of loop dispensers, affect the subsequent injections by the remnants of the previous ones, retained in the incorrectly rinsed channel offsets.

The difficulty is reduced by the design of the valve according to the invention, in which the two sealing plates are centered on the outside diameter in a single cylindrical guide hole, wherein at least one plate or sleeve in which it is fixed has a centered The spherical shape and mutual pressure of the sealing plates is realized by a spring.

The described arrangement brings about a significant reduction in manufacturing accuracy requirements while maintaining the existing size of poorly rinsed channel overlaps, or vice versa, at the same manufacturing accuracy, changing poorly rinsed spaces and thereby improving chromatographic separation efficiency.

The attached drawing shows a cross-section of a realized loop dispenser according to the invention.

The sealing plates 1 mounted in the sleeves 5 with the centering surface 3 in the form of a ball are inserted into the cylindrical guide hole 2. The disc springs 4 supported on the thrust bearing 6 are not radially guided. The relative rotation of the plates ee takes place by means of a lever T mounted on the housing 15 of one of the sealing plates. The advantage is that only one guide surface of the cylindrical bore 2 and not two provide the relative position of the geometric axes of the plates 1, as is the case in the known construction, where one sealing plate 1 is centered by the roller bearing. In addition, the spherical centering surface 3 enables the self-aligning of the sealing plates 1 by the pressure of the spring 4.

Claims (1)

SUBJECT OF THE INVENTION A multi-way high pressure valve, for example for liquid ehromatografil, on the principle of a flat gate valve consisting of two sealing plates, characterized in that the two sealing plates (1) are centered on the outside diameter in a single cylindrical guide hole (2). 1) or the sleeve in which it is mounted has a spherical shape and a centered surface (3) and the pressure of the plates (1) is realized by a spring (4).