Joizie Jiang

Installation Requirements of Valve     DBV, as valve manufacturer, tells the installation requirements of valve in this paper.   Before being installed, the valve should be done pressure testing. In the test, we should check out 10% of each batch products(same specifications, same brand and same type), and no less than 1 piece. If there are substandard products, such as leaks and cracks , then check 20%. If there are still unqualified products, each valve should be tested or all are returned.      For the closed-circuit valves, which are installed at the main pipe as the role of cut off, they should be done shell testing and seal testing one by one. And the pressure of shell testing and seal testing both should meet the design requirements and factory regulations. After passing the tests, valves are allowed to be installed in the project. In the installation, people should ensure that the valves are at the correct positions and characterized by correct direction of im

Pneumatic butterfly valve is mainly composed of pneumatic actuator and butterfly valve. When we use pneumatic butterfly valve, there will always be some failures. If we can not timely do troubleshooting, it will have some impact. Therefore, it is important to quickly and accurately eliminate the malfunction of the pneumatic butterfly valve. Now, the technician from DBV talks about common faults and elimination methods of pneumatic butterfly valve for everyone: 1. It is installed in the pipe, the best position is the upright installation, but not upside down. 2 . If there need to install supporting flange, the suggestion is to install special flange of butterfly valve, that is to say socket welding steel flanges HGJ54-91. 3. After the stem has been installed and used, check the use effect regularly. And if find trouble, eliminate it in time 4. The products of metal sealing butterfly valve are not suitable for installation at the end of the pipeline. If it must be installed