Check valve for low pressure operating conditions

US12209673B2 · kind B2 · utility

Assignee

• BEIJING AEROSPACE PETROCHEMICAL TECHNOLOGY AND EQUIPMENT ENGINEERING CORPORATION LIMITED · CN

Inventors

• Xiaoxia Wei · Nanhu, CN
• Xianyu Bao · Lo Wu, CN
• Na Li · Beijing, CN
• Yixiao Wang · Dongyang City, CN
• Shangang Guo · Beijing, CN
• Ling Bian · Beijing, CN
• Honghui Yu · Beijing, CN
• Peng Shuai · Lo Wu, CN
• Xiaofeng Li · Plano, US
• Xuebin Wang · Laishui, CN
• Dianjing Chen · Beijing, CN
• Xuli Tang · Beijing, CN

Key dates

• Filing date: Sep 10, 2021
• Grant date: Jan 28, 2025
• Expiry date: Sep 30, 2041

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16K15/144
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A check valve for low pressure operating conditions includes: a valve cover, a valve body, and an upper diaphragm between the body and the cover. A first pressure cavity is provided on a lower surface of the valve cover and used for accommodating a backward direction medium, a second pressure cavity is machined on an upper surface of the valve body, within which an inflow passage and an outflow passage are provided, an inflow hole is machined from an inner wall of the inflow passage to a bottom face of the second pressure cavity, and a medium enters into the second pressure cavity from the inflow passage via the inflow hole, and applies upward pressure on the upper diaphragm. A backflow channel in communication with the first pressure cavity is machined on a side wall of the outflow passage.