Pressure control valve and supercritical fluid chromatograph

Patent metadata

Field	Value
Publication number	US-10648585-B2
Application number	US-201616072921-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Jan 27, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A pressure control valve is provided with a pressure control block. The pressure control block has a pressure control block having an opening portion provided on one outer surface, a pressure control surface provided as a plane at a bottom portion of the opening portion, and two internal channels having openings at the respective end portions of the pressure control surface. A sheet-like valve body having elasticity and arranged so as to cover the pressure control surface is provided in the opening portion of the pressure control block. A valve body driving portion is provided on a side opposite to the pressure control surface with the valve body interposed therebetween that adjusts an amount of a gap between the valve body and the pressure control surface by pressing the valve body in a direction perpendicular to the pressure control surface. The pressure control surface has higher hardness than a hard material.

First claim

The invention claimed is:

1. A supercritical fluid chromatograph comprising:
an analysis channel;
a mobile phase liquid delivery portion for delivering a mobile phase to the analysis channel;
a sample introduction portion for introducing a sample into the analysis channel;
a separation column arranged on a downstream side of the sample introduction portion on the analysis channel;
a detector arranged on a downstream side of the separation column on the analysis channel and detecting a sample component separated by the separation column; and
a pressure control valve, arranged on a downstream side of the detector on the analysis channel and controlling a pressure in the analysis channel to a pressure at which the mobile phase is in a supercritical state, further comprising:
a pressure control block having an opening portion provided on one outer surface, a pressure control surface provided as a plane at a bottom portion of the opening portion, and two internal channels having openings at respective end portions of the pressure control surface;
a sheet-like valve body having elasticity and arranged so as to cover the pressure control surface; and
a valve body driving portion provided on a side opposite to the pressure control surface with the valve body interposed therebetween, wherein the valve body driving portion is driven in a direction perpendicular to the pressure control surface so that an amount of a gap between the valve body and the pressure control surface is adjusted by pressing the valve body in the direction perpendicular to the pressure control surface, wherein
the pressure control surface is made of a material having higher hardness than the hardness of SUS316L.

2. The pressure control valve according to claim 1 , wherein the pressure control surface has a hardness of HV 1000 or more.

3. The pressure control valve according to claim 2 , wherein the pressure control surface has a hardness of HV 2000 or more.

4. The pressure control valve according to claim 3 , wherein the pressure control surface is covered with a DLC film.

5. The pressure control valve according to claim 4 , wherein the pressure control block is made of a hard material.

6. The pressure control valve according claim 1 , wherein the pressure control valve is provided in a channel that delivers a mixed liquid of a modifier and liquid carbon dioxide as a mobile phase for controlling a pressure in the channel to a pressure at which the mobile phase is in a supercritical state.

Assignees

• Shimadzu Corp

Inventors

• KORA Chihiro
• Okado Takao
• Owa Michiaki
• Iwata Yosuke

Classifications

• G01N30/20

  using a sampling valve · CPC title

• B01D15/40

  using supercritical fluid as mobile phase or eluent · CPC title

• G01N30/32

  of pressure or speed (G01N30/36 takes precedence) · CPC title

• F16K7/16

  the diaphragm being mechanically actuated, e.g. by screw-spindle or cam · CPC title

• F16K25/005 Primary

  Particular materials for seats or closure elements · CPC title