Manual valve is a kind of valve commonly used in equipment and devices, which is operated by handle and handwheel. Under normal circumstances, the clockwise rotation of the handle and handwheel is specified as the closing direction, and the counterclockwise rotation is specified as the [...]
ISO 9001 Quality Management System Certification The function of this certification is to establish a quality assurance system from product design to after-sales service, and to monitor and control the quality system, so as to ensure product quality and satisfy users. Through certification, it has [...]
When a valve is manufactured in batches of a certain specification, an authoritative organization should be entrusted to carry out the following test: Table of Content Performance tests Opening and closing torque of valve under working pressure Under the condition of working pressure, the continuous [...]
Valve material Since gray cast iron pipes are gradually not recommended, the valve body material should be mainly ductile cast iron, and the grade and the actual physical and chemical testing data of the casting should be indicated. Stem material Strive to use stainless steel [...]
Valve specifications and categories should meet the requirements of pipeline design documents The model of the valve should indicate the requirements of the national standard number on which it is based. If it is an enterprise standard, the relevant description of the model should be [...]
I have put forward the following suggestions on the classification of operating temperature of valves, which have been published in magazine “Valve”. A brief introduction is as follows: -254°C～-101°C, it is “ultra low temperature valve” The main material suitable for “ultra-low temperature valve” (-254°C [liquid [...]
Valve Basic Standards GB/T 1047-2005 Definition and selection of DN (Nominal size) of piping components GB/T 1048-2005 Definition and selection of PN (nominal pressure) of piping components GB/T 6567.4-2008 Technical drawings Graphical symbols of pipeline systems Valves and control components GB/T 12220-2015 Industrial valve Marking [...]
For the pipelines and storage equipment of refined oil, ball valves with flanged connnections need to be selected. In the pipeline system and device of low temperature medium, the low temperature ball valve with extended bonnet should be selected. On the pipeline system of the [...]
The pace of the 2022 Beijing Winter Olympics Games is gradually approaching. With the meteorological conditions and hardware facilities meeting the work requirements, the National Alpine Skiing Center has officially started the Winter Olympics snowmaking. After the official opening of the Winter Olympics on February [...]
Fully welded ball valves are widely used in various fields. Its superior quality and high performance stability are beyond the reach of ordinary cast steel ball valves, and its service life is far greater than cast steel ball valves. Fully welded ball valves are widely [...]
