Title:
AUTOMATIC BACK-PRESSURE VALVE FOR USE IN SUPERCRITICAL FLUID CHROMATOGRAPHIC SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/176736
Kind Code:
A1
Abstract:
Disclosed is an automatic back-pressure valve for use in a supercritical fluid chromatographic system, comprising: a spring support (1); an ejector rod spring (2); an ejector rod (3); a piston rod (4); a guide band (5); a cylinder body (6); an O-ring gasket A (7); an O-ring gasket B (8); a piston rod spring (9); a cylinder cover (10); a guide sleeve (11); a conical ceramic member (12); a gasket (13); a sealing base (14); a valve body (15); a bolt (16); and a positioning sleeve (17). The present invention adjusts a pressure of compressed air and an amount of compression of the ejector rod spring to ensure pressure control precision and stability of a system, thereby solving a problem in which existing manual back-pressure valves are unable to meet requirements of a supercritical fluid chromatographic instrument with respect to pressure stability and pressure control precision.
Inventors:
LIU JIE (CN)
ZHANG YAN (CN)
YAN ZHONG (CN)
LI ZHILING (CN)
ZHANG YAN (CN)
YAN ZHONG (CN)
LI ZHILING (CN)
Application Number:
PCT/CN2017/100498
Publication Date:
October 04, 2018
Filing Date:
September 05, 2017
Export Citation:
Assignee:
JIANGSU HANBON SCI & TECH CO (CN)
International Classes:
F16K31/122; F16K1/32; F16K1/38; F16K15/06; F16K17/04
Foreign References:
| CN206617649U | 2017-11-07 | |||
| CN107061843A | 2017-08-18 | |||
| CN205078862U | 2016-03-09 | |||
| CN202531513U | 2012-11-14 | |||
| CN202801279U | 2013-03-20 | |||
| CN2087270U | 1991-10-23 | |||
| US20030056830A1 | 2003-03-27 | |||
| US9081390B2 | 2015-07-14 |
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