Zhigang Liu

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Ball valve with forced-sealing operation
- Patent number 11,313,477
- Issue date Apr 26, 2022
- Zhigang Liu
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

Information Patent Application
Ball valve with forced-sealing operation
- Publication number 20210095770
- Publication date Apr 1, 2021
- Zibo Votaisi Petrochemical Equipment Co., Ltd
- Zhigang Liu
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...