Title:
CHECK VALVE FOR LOW PRESSURE OPERATING CONDITIONS
Document Type and Number:
WIPO Patent Application WO/2022/078135
Kind Code:
A1
Abstract:
A check valve for for low pressure operating conditions comprising: a valve cover (1), a valve body (2), and an upper diaphragm (3) between the body and the cover, a first pressure cavity (11) being provided on a lower surface of the valve cover (1) and used for accommodating a backward direction medium; a second pressure cavity (21) is machined on an upper surface of the valve body (2), within which an inflow passage (22) and an outflow passage are provided, an inflow hole (221) is machined from an inner wall of the inflow passage (22) to a bottom face of the second pressure cavity (21), and a medium enters into the second pressure cavity (21) from the inflow passage (22) via the inflow hole (221), and applies upward pressure on the upper diaphragm (3), causing the upper diaphragm (3) to move in the direction of the valve cover; a backflow channel (233) in communication with the first pressure cavity (11) is machined on a side wall of the outflow passage, and a portion of the backward direction medium that enters into the outflow passage can enter the first pressure cavity (11) by means of the backflow channel (233), and backward direction sealing can be executed by means of a pressure difference between upper and lower surfaces of the upper diaphragm (3). The present check valve is quickly opened when a medium is passing through the check valve, and backward direction sealing under low pressure can also be ensured by utilizing a pressure difference at the two sides of the upper diaphragm.
Inventors:
WEI XIAOXIA (CN)
BAO XIANYU (CN)
LI NA (CN)
WANG YIXIAO (CN)
GUO SHANGANG (CN)
BIAN LING (CN)
YU HONGHUI (CN)
SHUAI PENG (CN)
LI XIAOFENG (CN)
WANG XUEBIN (CN)
CHEN DIANJING (CN)
TANG XULI (CN)
BAO XIANYU (CN)
LI NA (CN)
WANG YIXIAO (CN)
GUO SHANGANG (CN)
BIAN LING (CN)
YU HONGHUI (CN)
SHUAI PENG (CN)
LI XIAOFENG (CN)
WANG XUEBIN (CN)
CHEN DIANJING (CN)
TANG XULI (CN)
Application Number:
PCT/CN2021/117737
Publication Date:
April 21, 2022
Filing Date:
September 10, 2021
Export Citation:
Assignee:
BEIJING AEROSPACE PETROCHEMICAL TECH AND EQUIPMENT ENGINEERING CORPORATION LIMITED (CN)
International Classes:
F16K15/14; F16K15/16
Domestic Patent References:
| WO2008089910A1 | 2008-07-31 | |||
| WO2018033453A1 | 2018-02-22 |
Foreign References:
| CN112377648A | 2021-02-19 | |||
| CN111536256A | 2020-08-14 | |||
| US7422030B2 | 2008-09-09 | |||
| CN103896368A | 2014-07-02 | |||
| CN207513975U | 2018-06-19 | |||
| CN204403466U | 2015-06-17 |
Attorney, Agent or Firm:
PATENT AGENT OF CHINA AEROSPACE TECHNOLOGY (CN)
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